2
We can help
Knowles reserves the right to change designs and specifications without prior notice.
Should a safety concern arise regarding this product, please contact us immediately
for technical consultation. Knowles cannot assume responsibility for any problems
arising out of the use of this product. This information does not convey any license
by any implication under any patents or other right.
At Knowles, we understand the pace
of innovation. Today’s product ideas
are tomorrow’s market realities, and
you can depend on us for rapid product
ideation, design, development,
manufacturing and delivery.
3
you every step of the way.
Founded in 1946, Knowles is the leading supplier of microphones and receivers to the hearing health industry, the #1 supplier of MEMS microphones (SiSonicTM),
receivers and speakers for mobile devices, and the preferred choice in the professional audio market for balanced armature speakers. We have more than
6,500 employees residing in 17 facilities across 11 countries with 35 years of Asia manufacturing experience. Knowles is owned by the Dover Corporation,
a multi-billion dollar diversified global manufacturer of innovative equipment and components, specialty systems and support services.
Knowles offers you a full spectrum of
MEMS microphones, balanced armature
speakers, dynamic speakers and receivers,
specialty microphones, boom assemblies
and sensors, custom assemblies,
and sound conditioning software.
This application guide will help you select
the right acoustic interface solution. It all
starts with your application. Or it begins
with an idea you may have.
For support from concept to design to
sub-assembly, or any step along the way,
just visit: www.knowles.com
MEMS MICROPHONES .................................................................................. 4-6
DYNAMIC SPEAKERS ...................................................................................7-11
DYNAMIC RECEIVERS ................................................................................12-15
BALANCED ARMATURE SPEAKERS ............................................................. 16-25
ELECTRET MICROPHONES ...........................................................................26-30
BOOMS & SENSORS ...................................................................................31-34
ACCELEROMETERS & ACOUSTIC DAMPER SCREENS .............................................35
ACOUSTIC SOFTWARE ....................................................................................36
TECHNOLOGY BASICS ................................................................................37-39
Table of Contents
MEMS MICROPHONES
s MaxRF models eliminate GSM/TDMA burst noise and provide wide-band RF noise suppression
s Slim UltraMini footprint - less than 8.5mm2 (SPQ Series)
s Integrated designs with differential and ultrasonic outputs
sZero Height Mic™ for thinnest ever designs
SiSonic™ MEMS Microphones
Built on our CMOS/MEMS technology platform, the SiSonic™ silicon-based
MEMS microphone series is a step ahead of the competition with product
shipments exceeding 3 billion units to date. The proven and evolving design
series continues to support high-performance, high-density innovation
in such applications as cell phones, smart phones, laptop computers,
sensors, digital still cameras, portable music players, and other portable
electronic devices.
Design variables include ever-smaller sizes, lower profiles and mounting
options, increased output capacities, and new digital audio options that
eliminate analog noise. For manufacturers, surface mount designs eliminate off-
line subassembly production costs. Customized designs are supplied on tape-
and-reel and can be run through standard automatic pick-n-place equipment
during in-line surface mount manufacturing.
The microphones can also be integrated with our patented IntelliSonic™
software and special porting designs to provide a precisely customized sound.
4www.knowles.com
Typical RF Performance of Microphone Families
Port Configurations
sMaxRF:
Best in class filtering for RF applications;
GSM mobile phones, near-antenna designs
sEnhanced RF:
Good filtering for general RF applications;
mobile phones with clean RF designs
sStandard:
Best for non-RF applications;
DSC, MP3, headsets
Frequency (GHz)
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
dBv
Device Case
Rubber Gasket
Acoustic Port
Microphone
PCB
Zero Height Mic (Bottom Port) Legacy Standard (Top Port)
TM
1.5 mm
0.5 mm
Bottom port mounting enables minimum PCB-to-case thickness,
simple gasket designs, and best-in-class SNR
Sensitivity
Standard
Enhanced RF
MaxRF
Noise Floor
Key
MEMS MICROPHONES
Note: All performance curves are typical
Part Numbering
Top Port Analog
t416BOE412MFTTUIBONN2GPPUQSJOUTBSFJEFBMGPSNVMUJQMF
NJDSPQIPOFBQQMJDBUJPOT
t.BY3'UFDIOPMPHZQSPWJEFTXJEFCBOEOPJTFTVQQSFTTJPO
GPSDPNQBDUEFWJDFTXJUIDIBMMFOHJOHSPVUJOHBOEMBZPVUT
t"MM4J4POJD™NJDSPQIPOFTBSFEFTJHOFEXJUIMFBEJOHFEHF.&.4
UFDIOPMPHZGPSTUBCMFBDPVTUJDQFSGPSNBODFVOEFSFYUSFNF
DPOEJUJPOTTVDIBTIJHIUFNQFSBUVSFTIPDLBOEWJCSBUJPO
Model Description Size (mm) Su ppl y Vol t a ge
(min-max)
RF
Immunity
Sensitivity @1kHz
(dBV/Pa)
Output
Impedance
(Ohms)
Maximum Cur-
rent Drain (mA)
SPQ0410HR5H Unity Gain 3.76 x 2.24 x 1.10 1.5 to 3.6v MaxRF -42.0 <400 <0.25
SPQ2410HR5H Unity Gain 3.76 x 2.24 x 1.10 1.5 to 3.6v MaxRF -42.0 <400 <0.25
SPU0409HD5H Unity Gain 3.76 x 2.95 x 0.90 1.5 to 3.6v Standard -42.0 <100 <0.19
SPU0410HR5H Unity Gain 3.76 x 2.95 x 1.10 1.5 to 3.6v MaxRF -42.0 <400 <0.16
SPU0414HR5H Amplied 3.76 x 2.95 x 1.10 1.5 to 3.6v MaxRF -22.0 <400 <0.22
SPUL409HE5H Unity Gain 3.76 x 2.95 x 1.10 1.5 to 3.6v Enhanced -42.0 <300 <0.19
1
Product Description
SPY: (3.00 x 1.90)
SPQ: (3.76 x 2.24)
SPU: (3.76 x 2.95)
SPM: (4.72 x 3.76)
SPA: (3.35 x 2.50)
SPK: (4.00 x 3.00)
2
Series
0406: Differential
0409: Unity Gain
0410: Unity Gain
0414: Amplied
0415: Digital
0423: Digital
0824: Unity Gain
0833: Digital
1410: Unity Gain
1423: Digital
2410: Unity Gain
3
Port Hole Type
H: Top Port
L: Bottom Port
4
RF Filter
D: Standard
E: Enhanced
M: Enhanced
R: MAX-RF
5
Supply Voltage
3: 1.5-5.5V
4: 1.6-3.6V
5: 1.5-3.6V
7
Version
Knowles Internal
(Reference Only)
6
Halogen Free
8
Packaging QTY
Product Specic
(Reference Only)
SPU0410HR5H-PB-7
1 2 3 4 5 6 7 8
www.knowles.com 5
MEMS MICROPHONES
Model Description Size (mm) Supply Voltage
(min-max)
RF
Immunity
Sensitivity
(dBFS/Pa)
Output
Impedance
(Ohms)
Maximum Current
Drain (mA)
SPK0833LM4H Digital 4.00 x 3.00 x 1.00 1.6 to 3.6v Digital MaxRF -26.0 160pf
Maximum Load <0.70
SPK0415HM4H Digital 4.00 x 3.00 x 1.06 1.6 to 3.6v Digital Enhanced -26.0 100pf
Maximum Load <0.65
SPM0423HD4H Digital 4.72 x 3.76 x 1.25 1.6 to 3.6v Digital Standard -26.0 100pf
Maximum Load <0.60
SPM0423HE4H Digital 4.72 x 3.76 x 1.25 1.6 to 3.6v Digital Enhanced -26.0 100pf
Maximum Load <0.60
SPM0423HM4H
Digital 4.72 x 3.76 x 1.25 1.6 to 3.6v Digital Enhanced -26.0 100pf
Maximum Load <0.60
SPM1423HM4H
Digital 4.72 x 3.76 x 1.25 1.6 to 3.6v MaxRF -22.0 100pf
Maximum Load <0.60
Digital
t)FMQTSFEVDFTZTUFNOPJTFPOBVEJPTJHOBMMJOFT
t&BTJFSGBTUFSUPSPVUFBOEMBZPVUEJHJUBMUSBDFTXJUIPVU
TJHOBMDPSSVQUJPO
t%JHJUBM1%.1VMTF%FOTJUZ.PEVMBUJPOPVUQVUBWBJMBCMF
XJUIJOUFHSBUFETMFFQNPEFBOEDPNQBUJCMFXJUITUFSFP
JOQVUBQQMJDBUJPOT
6www.knowles.com Note: All performance curves are typical
Model Description Size (mm) S u p p l y V o l t a g e
(min-max)
RF
Immunity
Sensitivity @1kHz
(dBV/Pa)
Output
Impedance
(Ohms)
Maximum Current
Drain (mA)
SPY0824LR5H Unity Gain 3.00 x 1.9 x 0.90 1.5 to 3.6v MaxRF -38.0 <400 <0.16
SPA2410LR5H Unity Gain 3.35 x 2.50 x 0.98 1.5 to 3.6v MaxRF -38.0 <400 <0.25
SPU0409LE5H Unity Gain 3.76 x 3.00 x 1.10 1.5 to 3.6v Enhanced -38.0 <200 <0.25
SPU0410LR5H* Unity Gain 3.76 x 3.00 x 1.10 1.5 to 3.6v MaxRF -38.0 <400 <0.25
SPU1410LR5H Unity Gain 3.76 x 3.00 x 1.10 1.5 to 3.6v MaxRF -38.0 <400 <0.25
SPM0406HE3H Differential 4.72 x 3.76 x 1.25 1.5 to 5.5v Enhanced -22.0 <500 <0.50
Bottom Analog
t416BOE41"MFTTUIBONN2GPPUQSJOUTBSFJEFBMGPS
NVMUJQMFNJDSPQIPOFBQQMJDBUJPOT
t4J4POJD™;FSP)FJHIU.JD™TISJOLTQSPEVDUUIJDLOFTT
CZVQUP
t.JOJNJ[FTUIFEJTUBODFCFUXFFO1$#BOEEFWJDFIPVTJOH
t&OBCMFTUIFUIJOOFTUIJHIFTUEFOTJUZQSPEVDUEFTJHOT
*Extended frequency response for ultrasonic applications
www.knowles.com 7
Knowles dynamic speakers are designed to maximize space efficiency and provide
superior audio performance for voice and music in small, slim consumer devices, such as
mobile handsets or smartphones.
Knowles dynamic speakers are available in various sizes and performance levels, which
can be customized to meet your specific requirements. Dedicated support is provided to
realize the optimal sound performance in your application.
To assure the highest quality standards, the speakers are manufactured in a process that
uses 100% in-line measurement of all specified acoustical and electrical parameters.
s High quality and robustness
s Maximized space efficiency
s Excellent audio performance-to-size ratio
s Optimized for all mobile sound applications (handsfree and ringtone)
s Multi-functional devices including vibration
s Dedicated application support
DONAU – 11 x 15 x 3.5 (mm)
Typical applications: mobile phones, music phones, stereo solutions.
s Industry reference standard
s Compound membrane for minimum THD, Q-factor
and tumbling
s Very good performance/price ratio
s Pre-loaded springs for mechanical robustness
and easy handling
Model Sensitivity
(W/m)*
Air Pumping
Capacity
Typical Backvolume
(total volume)
f0 (in typical
backvolume)
Frequency Range
(Hz)**
Nominal
Power***
SPL Max
(@ max sine power)****
2403 260 00001 73 dB 69 mm³ 1 cm³ (1.57 cm³) 800 Hz 650 – 16000 500 mW 89 dB (350 mW)
Note: Impedance of all speaker devices is typically 8 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle
** in front firing application without mesh, at -3dB points after resonance peaks, without EQ correction
*** using noise shaped signal according to product data sheet
**** average value measured in baffle in 0.1 meter distance at max sine power, in typical backvolume
0
5
10
15
20
25
30
35
85
80
75
70
90
95
100
105
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
Measured in IEC baffle with 1 cm3 back cavity at 350mW in 10 cm distance
www.knowles.com
DYNAMIC SPEAKERS
Dynamic Speakers
www.knowles.com
8
Note: Impedance of all speaker devices is typically 8 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle
** in front firing application without mesh, at -3dB points after resonance peaks, without EQ correction
*** using noise shaped signal according to product data sheet
**** average value measured in baffle in 0.1 meter distance at max sine power, in typical backvolume
SAMBO – 13 x 18 x 4.5 (mm)
Typical applications: multimedia and smartphones.
0
5
10
15
20
25
30
35
85
80
75
70
90
95
100
105
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
sOptimized for maximum SPL
sCompound membrane for minimum THD, Q-factor
and tumbling
sIncreased power-handling capacity
sPre-loaded springs for mechanical robustness
and easy handling
Model Sensitivity
(W/m)*
Air Pumping
Capacity
Typical Backvolume
(total volume)
f0 (in typical
backvolume)
Frequency Range
(Hz)**
Nominal
Power***
SPL Max
(@ max sine power)****
2403 260 00058 77 dB 100 mm³ 1 cm³ (2.05 cm³) 900 Hz 700 – 16000 700 mW 95.5 dB (700 mW)
Measured in IEC baffle with 1 cm3 back cavity at 700mW in 10 cm distance
DUMBO – 13 x 18 x 4.5 (mm)
Typical applications: waterproof, large bandwidth music and smart phones.
sOptimized for extended low frequencies through
ultra-high excursion
sIPx7 waterproof standard compliant
sUnique Knowles silicone membrane providing minimum
THD, Q-factor and tumbling
sIncreased power-handling capacity
sPre-loaded springs for mechanical robustness
and easy handling
Model Sensitivity
(W/m)*
Air Pumping
Capacity
Typical Backvolume
(total volume)
f0 (in typical
backvolume)
Frequency Range
(Hz)**
Nominal
Power***
SPL Max
(@ max sine power)****
2403 260 00057 73 dB 140 mm³ 1 cm³ (2.05 cm³) 650 Hz 500 - 16000 700 mW 91.5 dB (700 mW)
Measured in IEC baffle at 700mW in 10 cm distance with 1 ccm back cavity
0
5
10
15
20
25
30
35
85
80
75
70
90
95
100
105
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
DYNAMIC SPEAKERS
Note: Impedance of all speaker devices is typically 8 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle
** in front firing application without mesh, at -3dB points after resonance peaks, without EQ correction
*** using noise shaped signal according to product data sheet
**** average value measured in baffle in 0.1 meter distance at max sine power, in typical backvolume
9
www.knowles.com
DYNAMIC SPEAKERS
FOX – 9 x 16 X 3.0 (mm)
Typical applications: multimedia phones.
s
Easy mechanical integration due to small width
s
Compound membrane for minimum THD, Q-factor and tumbling
0
10
20
30
40
50
60
70
30
40
50
60
70
80
90
100
110
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
Model Sensitivity
(W/m)*
Air Pumping
Capacity
Typical Backvolume
(total volume)
f0 (in typical
backvolume)
Frequency Range
(Hz)**
Nominal
Power***
SPL Max
(@ max sine power)****
2403 260 00086 70.5 dB 55 mm³ 1 cm³ (1.43 cm³) 850 Hz 700 - 20000 500 mW 86.5 dB (500 mW)
Measured in IEC baffle at 500mW in 10 cm distance with 1 ccm back cavity
NAUTILUS 180 – 11 x 15 x 4.0 (mm)
Typical applications: lateral sound outlets.
90
85
8O
75
70
95
100
105
110
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
20
15
10
5
0
25
30
35
40
s Lateral sound outlet integrated in cover of speaker
s Significant height reduction for side-firing applications
s Based on mature 11 x 15 x 3.5 speaker
s Also available as NAUTILUS with sound outlets
on opposite side (2403 260 00085)
s Pre-loaded springs for mechanical robustness
and easy handling
Model Sensitivity
(W/m)*
Air Pumping
Capacity
Typical Backvolume
(total volume)
f0 (in typical
backvolume)
Frequency Range
(Hz)**
Nominal
Power***
SPL Max
(@ max sine power)****
2403 260 00089 73 dB 69 mm³ 1 cm³ (1.66 cm³) 750 Hz 650 - 12000 500 mW 89 dB (350 mW)
Measured in IEC baffle at 700mW in 10 cm distance with 1 ccm back cavity
Note: Impedance of all speaker devices is typically 8 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle
** in front firing application without mesh, at -3dB points after resonance peaks, without EQ correction
*** using noise shaped signal according to product data sheet
**** average value measured in baffle in 0.1 meter distance at max sine power, in typical backvolume
MFD16 – 16 x 4.7 (mm)
Typical applications: vibrator, speaker and receiver combined.
0
5
10
15
20
25
30
35
85
80
75
70
90
95
100
105
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
sUsage as speaker/receiver/vibrator or speaker/vibrator
sBuilt-in vibrator saves cost
sSpring contacts for firm connection
Model Sensitivity
(W/m)*
Air Pumping
Capacity
Typical Backvolume
(total volume)
f0 (in typical
backvolume)
Frequency Range
(Hz)**
Nominal
Power***
SPL Max
(@ max sine power)****
2403 263 00077 74 dB 90 mm³ 2 cm³ (2.93 cm³) 740 Hz 650 - 15000 500 mW 91dB (500 mW)
Baffle in P=125mW with 2 cm back cavity in 10 cm distance
Speaker Boxes
Speaker Boxes are designed for mobile phones, tablets and other consumer electronics. Knowles develops
and manufactures integrated acoustic modules which are fully customized and provide an optimized
acoustic design for any form factor.
sOEM/ODM solutions
sOptimized acoustic design
sPassive/Active
sCustom designed
10 www.knowles.com
DYNAMIC SPEAKERS
Speaker Design Options
N’Bass™ Virtual Back Volume Technology
N‘Bass™ stands for “enhanced bass“ and is a unique sound enhancing technology for miniaturized
speaker systems developed by Knowles. Knowles is the only supplier who offers this specific technology
for miniaturized speaker systems. N‘Bass™ is a special material which increases the back volume seen by
the speaker by up to 100% thus enabling either a better acoustic performance – specifically more bass –
or smaller speaker box designs. It also enables the usage of bigger speakers with the same gross
application volume. The N‘Bass™ material has no negative influence on antenna performance compared
to conventional materials.
www.knowles.com 11
DYNAMIC SPEAKERS
DYNAMIC SPEAKERS
Knowles dynamic receivers are designed to maximize space efficiency and provide
superior audio performance for voice and music in small, slim consumer devices,
such as mobile handsets or smartphones.
Knowles dynamic receivers are available in various sizes and performance levels,
which can be customized to meet your specific requirements. Dedicated support is
provided to realize the optimal sound performance in your application.
To assure the highest quality standards, the receivers are manufactured in a
process that uses 100% in-line measurement of all specified acoustical and
electrical parameters.
sHigh quality and robustness
sMaximized space efficiency
sExcellent audio performance-to-size ratio
sOptimized for all mobile sound applications (handsfree and ringtone)
sMulti-functional devices including vibration
sDedicated application support
60
55
50
45
40
35
30
65
70
75
80
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
Series 1 THD
30
25
20
15
10
5
0
35
40
45
50
sDesigned for 3GPP wide band
s6 kHz peak optimized for extended range without
additional resonators
sHearing Aid Compatibility (HAC) according to
ANSI C63.19-2006
sPre-loaded spring contacts for pick & place with mounting
possibility for flexprint
sCompound membrane for minimum THD, Q-factor
and tumbling
PETRA – 8 x 12 x 2 (mm)
Typical applications: flat phones, hearing aid compatibles, wide band in hi-leak applications.
Model Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz)** Maximum Sine Power SPL Max
(@ max sine power)***
2403 260 00031 68 dB 20 mm³ 350 Hz 300 - 7000 5 mW 110 dB
Measured in IEC baffle with open back volume (1mW, 10 cm)
Note: Impedance of all receiver devices is typically 32 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle, subtract 10dB for value in dB/mW/0.1m
** in typical application, at -3dB points after resonance peaks, without EQ correction
*** measured at 1 kHz in 3.2 high leak adapter
DYNAMIC RECEIVERS
Dynamic Receivers
12 www.knowles.com
0
20
15
10
5
25
30
35
40
45
50
65
60
55
50
70
75
80
85
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
0
20
15
10
5
25
30
35
40
45
50
65
60
55
50
70
75
80
85
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
sWorld’s smallest telecom receiver
sIntegrated dust mesh for dust protection
sIntegrated mounting parts for space positioning
and/or flexprint connection
sPre-loaded springs for mechanical robustness
and easy handling
sDesigned for 3GPP wide band with extended bass
response in high leak applications
sVery high air pumping capacity
sHearing Aid Compatibility (HAC) according to ANSI
C63.19-2006
s7 kHz peak optimized for extended range without
additional resonators
sCompound membrane for minimum THD, Q-factor
and tumbling
M-STOUT – 4.8 x 10 x 2.2 (mm)
Typical applications: smartphones, small application space.
ZWEIGELT – 8 x 15 x 2.5 (mm)
Typical applications: wide-band, hearing aid compatibles, extended bass
in hi-leak applications.
Model Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz)** Maximum Sine Power SPL Max
(@ max sine power)***
2403 260 00041 65 dB 9 mm³ 520 Hz 450 - 8000 10 mW 110 dB
Model Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz)** Maximum Sine Power SPL Max
(@ max sine power)***
2403 260 00045 69 dB 36 mm³ 300 Hz 160 – 7000 10 mW 114 dB
Measured in IEC baffle with open back volume (10mW, 10 cm)
Measured in IEC baffle with open backvolume (1mW, 1cm)
Note: Impedance of all receiver devices is typically 32 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle, subtract 10dB for value in dB/mW/0.1m
** in typical application, at -3dB points after resonance peaks, without EQ correction
*** measured at 1 kHz in 3.2 high leak adapter
DYNAMIC RECEIVERS
www.knowles.com 13
60
55
50
45
40
35
30
65
70
75
80
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
Series 1 THD
30
25
20
15
10
5
0
35
40
45
50
s$ESIGNEDFOR'00WIDEBAND
sK(ZPEAKOPTIMIZEDFOREXTENDEDRANGEWITHOUT
ADDITIONALRESONATORS
s(EARING!ID#OMPATIBILITY(!#ACCORDINGTO
!.3)#
s0RELOADEDSPRINGCONTACTSFORPICKPLACEWITHMOUNTING
POSSIBILITYFORmEXPRINT
s#OMPOUNDMEMBRANEFORMINIMUM4($1FACTOR
ANDTUMBLING
LEAN – 6 x 12 x 2 (mm)
Typical applications: flat phones, hearing aid compatibles, extended range
in hi-leak applications.
Model Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz) ** Maximum Sine Power SPL Max
(@ max sine power)***
2403 260 00051 65 dB 20 mm³ 350 Hz 300 - 7000 10 mW 110 dB
Note: Impedance of all receiver devices is typically 32 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle, subtract 10dB for value in dB/mW/0.1m
** in typical application, at -3dB points after resonance peaks, without EQ correction
*** measured at 1 kHz in 3.2 high leak adapter
Measured in IEC baffle with open back volume (1mW, 10 cm)
s$ESIGNEDFOR'00WIDEBAND
s(EARING!ID#OMPATABILITY(!#ACCORDINGTO!.3)#
s0RELOADEDSPRINGCONTACTSFORBETTERHANDLINGANDPOSITIONING
s)NTEGRATEDREARMESHFORDUSTPROTECTIONFRONTMESHONREQUEST
s!LSOAVAILABLEWITHF(ZAS#/,%-!.
COLEMAN 350 – 6 x 15 x 2 (mm)
Typical applications: flat phones, smartphones, hearing aid compatibles.
Model Id Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz)** Maximum Sine Power SPL Max
(@ max sine power)***
2403 260 00096 68 dB 28 mm³ 350 Hz 300-7000 15 mW 115 dB
Measured in IEC baffle at 15mW in a 10cm distance
14 www.knowles.com
DYNAMIC RECEIVERS
0
10
20
30
40
50
60
50
55
50
65
70
75
80
100 1000 10000
f [Hz]
SPL THD
THD [%]
SPL [dB rel 20uPa]
0
20
15
10
5
25
30
35
40
45
50
55
50
45
40
60
65
70
80
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
SPL THD
sHigh Sensitivity
sSpring contacts for pick & place
sWith integrated HAC coil in parallel (16 ohms
total impedance)
sAlso available in 32 ohms without HAC coil
(2403 263 00047)
JULIA HAC – 6 x 15 x 2.5 (mm)
Typical applications: mobile phones, hearing aid compatibles
Model Id Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz)** Maximum Sine Power SPL Max
(@ max sine power)***
2403 263 00052 70 dB 16 mm³ 450 Hz 400-4000 20 mW 111.5 dB
Measured in IEC baffle with open backvolume (20mW, 10cm)
60
55
50
45
40
35
30
65
70
75
80
100 1000 10000
THD [%]
SPL [dB rel 20uPa]
f [Hz]
Series 1 THD
30
25
20
15
10
5
0
35
40
45
50
sDesigned for 3GPP wide band with extended bass
response in low leak applications
sHearing Aid Compatibility (HAC) according to
ANSI C63.19-2006
s7 kHz peak optimized for extended range without
additional resonators
s Triple magnet for high sensitivity
NITH – 8 x 15 x 1.5 (mm)
Typical applications: wide-band, hearing aid compatibles, extended bass in
low-leak applications.
Model Id Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz)** Maximum Sine Power SPL Max
(@ max sine power)***
2403 263 00092 69 dB 25 mm³ 300 Hz 160 - 7000 10 mW 114 dB
Measured in IEC baffle with open backvolume (10mW, 1cm)
www.knowles.com 15
Note: Impedance of all receiver devices is typically 32 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle, subtract 10dB for value in dB/mW/0.1m
** in typical application, at -3dB points after resonance peaks, without EQ correction
*** measured at 1 kHz in 3.2 high leak adapter
DYNAMIC RECEIVERS
BALANCED ARMATURE SPEAKERS
TWFK SERIES – Dual Balanced Armature Speaker 5.00 x 2.73 x 3.86 (mm)
One of the smallest dual balanced armature speakers, the TWFK is designed for
pro-audio in-ear applications. Enables customized cross-over systems to achieve
target frequency response in a package size smaller than the ED Series.
Knowles sub-miniature speaker designs are based on balanced armature technology
(BAX) and are utilized in a variety of high performance audio and communication
products. Knowles balanced armature speakers are available in several sizes
and efficiencies, which can be finely tuned to meet your specific performance
requirements. They are designed for use in in-ear applications, including earphones
and communication earpieces, or be sub-assembled by Knowles for premium
consumer electronics accessories.
sHigh efficiency, stability and reliability
sCustomizable performance and port locations
s Ideal for premium in-ear designs
s Component and subassembly solutions
Balanced Armature Speakers
s Single sound port for simplified earphone design
s Extreme wideband frequency response
s Unique woofer/tweeter combination
s Enables leading-edge earphone designs for miniature size and
performance
OUTPUT (dB SPL)
120
110
100
90
80
70
60
50
40
100907060
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
s Two-terminal zero-bias configuration
sUndamped, screen damped, and internally damped responses
sWide range of coil impedances
sDFK model is a dual FK
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80
10k100 1k
2 3 4 5 6 7 8 9
FK/DFK SERIES – Balanced Armature Speaker
5.00 x 2.73 x 1.93 (mm) (FK), 5.00 X 2.73 X 3.86 (mm) (DFK)
One of the smallest balanced-armature speakers, the FK Series is designed
for applications where size is the most important design concern.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
TWFK-30017-000 12S 95 103 25 31
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
FK-23451-000
12S
95.5 108.5 360 450
FK-23466-000
12S
95.5 108.5 360 450
FK-26260-000
12S
96 105 135
180
DFK-30041-000
12S
99.7 105.5 100
133
16 www.knowles.com
*Note: Chart for reference only to show performance
with insert earphone coupler
TWFK-30017-000 into IEC711 coupler, V_RMS=0.085V*
Note: All performance curves are typical
s Undamped, screen damped, internally damped, and Ferrofluid ™
damped responses
s Various port locations, coil impedances, damping options,
termination configurations, and frequency responses available
s Maximum SPL output of 123dB at resonance peak, 109dB
at midband (500Hz)*
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80
10K
100 1K
BALANCED ARMATURE SPEAKERS
s Lower low/mid-band sensitivity compared to FK Series
s Best high frequency response of any Knowles element
s Combine with low/mid-range speaker for
extended frequency response
s TWFK pairs WBFK with low frequency FK
WBFK SERIES – Wideband Balanced Armature Speaker 5.00 x 2.73 x 1.93 (mm)
Same package size as FK Series, WBFK has extended high frequency response.
It is recommended as a high frequency component to be combined with low/
midrange speaker for music earphones.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
WBFK-30000-000
12S
95 105 100 111
WBFK-30095-000
12S
91 105 12.5 13.5
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
FH-23371-000
12S
100 113 60 90
FH-23375-000
12S
100 113 240 335
FH-23377-000
12S
100 113 515 685
FH-23821-000
12S
100 113 125 174
FH-26553-000
12S
100 113 60 90
FH SERIES – Balanced Armature Speaker 5.09 x 2.80 x 2.59 (mm)
The FH speaker represents an unprecedented combination of ultra-compact size and
high SPL output with efficiencies normally found only in much larger speakers. The FH
speaker line brings true high-gain, high-output performance to earphone designs.
www.knowles.com 17
*Note: Chart for reference only to show performance
with insert earphone coupler
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL)
WBFK-30095-000 into IEC711 coupler, V_RMS=0.094V*
Note: All performance curves are typical
BALANCED ARMATURE SPEAKERS
s,OWERLOWMIDBANDSENSITIVITYCOMPAREDTO(#SERIES
s#OMBINEWITHLOWMIDRANGESPEAKERFOREXTENDED
FREQUENCYRESPONSE
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80 2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
s(IGHOUTPUTTECHNOLOGYPROVIDESDOUBLED"THEMAXIMUM
ACOUSTICOUTPUTOFEXISTING+NOWLES&#3ERIESSPEAKERS
s-AXIMUMOUTPUTCOMPARABLETO+NOWLES%$3ERIESSPEAKER
INAPACKAGESIZEONLYASLARGE
s3AMESIZEANDDIMENSIONSAS+NOWLES%(3ERIES
s)DEALFORAPPLICATIONSWHERESMALLSIZEANDHIGHOUTPUTISREQUIRED
SENSITIVITY IN dB RELATIVE TO 20μPa
HC SERIES – Balanced Armature Speaker 5.16 x 3.51 x 3.00 (mm)
Knowles balanced-armature, magnetic technology provides high efficiency, stability
and reliability. HC Series provides increased low frequency dynamic range in a
package size equal to FC.
s!VAILABLEIN(IGH/UTPUT(#SPEAKERVERSION
s4WOTERMINALZEROBIASANDTHREETERMINALCENTERTAPPEDCONlGURATIONS
s5NDAMPEDSCREENDAMPEDINTERNALLYDAMPEDAND
&ERROmUIDÍDAMPEDRESPONSES
s2OUNDEDCORNERSFORIMPROVEDlTRATESSMALLERCROSSSECTION
COMPAREDTO%(SPEAKER
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80
10k100 1k
2 3 4 5 6 7 8 9
FC SERIES – Balanced Armature Speaker 5.18 x 3.55 x 3.00 (mm)
FC Series speakers may be used for small radio communication earphones where ED
size does meet package requirements. Rounded corners make it slightly smaller
compared to EH Series speakers.
WBHC SERIES – Wideband Balanced Armature Speaker 5.16 x 3.51 x 3.00 (mm)
The advanced design of the HC Series speaker provides extended acoustic bandwidth for
hi-fi in-ear speakers when paired with a low frequency speaker.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
HC-23761-000 12C 101 107 4.9 8.4
HC-23763-000 12C 101 107 11.5 20
HC-23764-000 12C 101 107 15.5 24
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
WBHC-23910-000 12C 95 106 120 130
WBHC-30670-000 12C 95 105 44 46
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
FC-26171-000 12C 104 117 135 170
FC-26465-000 12C 104 117 42 57
FC-26654-000 12C 104 113 40 60
FC-26887-000 12C 104 105 354 425
FC-30814-000 12C 100 106 52 60
18 www.knowles.com
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL)
*Note: Chart for reference only to show performance
with insert earphone coupler
WBHC-23910-000 into IEC711 coupler, V_RMS=0.283V*
Note: All performance curves are typical
EH SERIES – Balanced Armature Speaker 5.19 x 3.55 x 3.00 (mm)
EH Series speakers are approximately 2/3 the size of ED speakers and may be used for small
radio communication earphones where ED size does not meet package requirements.
s EH micro speaker, but with internal, highly-efficient, class D amplifier
s Lower current drain prolongs battery life
s Lower distortion
s Available in a range of SPL ratings
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80 2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
s Balanced-armature, magnetic technology to give high efficiency,
stability and reliability
sHigh sensitivity
s Various responses, including standard, damped and modified
s Low distortion
sSelf-shielded for low magnetic radiation FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80 2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
s Dual element with enhanced bass capabilities
and wideband response
s Unique, subminiature woofer/tweeter
combination for in-ear applications
sSingle port for simplified earphone design
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
EH-23030-000 12C 100 117 395 625
EH-23149-000 12C 100 116 68 101
EH-27479-000 12C 100 112.5 118 144
ES SERIES – Balanced Armature Amplified Speaker 5.18 x 3.54 x 3.04 (mm)
EH size speaker with integrated Class D power amplifier.
GQ SERIES – Two-Way Balanced Armature Speaker 6.30 x 4.29 x 4.92 (mm)
The GQ is a two-way balanced armature system with added low frequency
headroom, designed for pro-audio\in-ear application. Enables customized
cross-over response to achieve target frequency response.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
GQ-30783-000 12S 109.5 116 12.5 21.5
GQ-30710-000 12C 106 119.5 25.4 51.7
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL)
ES-23127-000 12C 101 107
ES-23140-000 12C 101 105.5
BALANCED ARMATURE SPEAKERS
www.knowles.com 19
130
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL)
GQ-30710-000 into IEC711 coupler, V_RMS=0.146V*
Note: All performance curves are typical *Note: Chart for reference only to show performance
with insert earphone coupler
s&ERROmUID ™DAMPEDWITHD"D"ORD"PEAKAMPLITUDE
s3UPERIORSHOCKPERFORMANCEANDREDUCEDSPEAKERVIBRATION
s4WOTERMINALZEROBIASANDTHREETERMINALCENTERTAPPEDCONlGURATIONS
s.UMEROUSPORTLOCATIONSANDCOILIMPEDANCES
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80
75
70 2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
s5NDAMPEDSCREENDAMPEDINTERNALLYDAMPEDAND&ERROmUID ™
DAMPEDRESPONSES
s.UMEROUSPORTLOCATIONSANDCOILIMPEDANCES
s(IGHEFlCIENCYANDLOWDISTORTION
FED SERIES – Balanced Armature Speaker 6.32 x 4.31 x 2.47 (mm)
The addition of &ERROmUID ™ to Knowles ED series speakers improves mechanical shock
survival and provides peak damping to smooth frequency response.
ED SERIES – Balanced Armature Speaker 6.32 x 4.31 x 2.97 (mm)
One of Knowles’ most versatile and most popular speakers, its compact size and
appreciable output power make the ED speaker suitable for a variety of instruments.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
ED-21744-000 12C 104 112.5 825 1700
ED-21913-000 12C 104 117.5 376 780
ED-23147-000 12C 102.5 110 25 48
ED-23619-000 12C 104 117.5 3.3 7.1
ED-23801-000 12C 104 113 155 196
ED-23814-000 12C 104 112.5 23 50
ED-26245-000 12C 104 113 35 55
ED-26598-000 12C 102.5 106 196 395
ED-26821-000 12C 102.5 111 3.3 7.1
ED-27045-000 9C 104 113 196 395
ED-27230-000 12C 104 117.5 54.5 79
ED-27304-000 12C 104 117 201 290
ED-29689-000 12C 104 118 3.7 7.1
ED-26805-000 12C 102 110 23 26
ED-26876-000
12C
102.5 111 25 48
ED-31305-163
12C
106.5 119.5 39.2 58.8
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
FED-26792-I04 12C 102.5 107 116.5 65
FED-30048-I04 12N 102 107 116 26
20 www.knowles.com
BALANCED ARMATURE SPEAKERS
130
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL)
*Note: Chart for reference only to show performance
with insert earphone coupler
ED-30262-000 into IEC711 coupler, V_RMS=0.101V*
Note: All performance curves are typical
s Similar SPL output to the BK Series
s Rounded corners on the face opposite the terminal pad
s 34% smaller volume than the BK Series
FREQUENCY (Hz)
125
120
115
110
105
100
95
90
85 2 3 4 5 6 7 8 9
10k
100 1k 2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
s Class D amplified magnetic speaker
s Self-shielded to reduce magnetic radiation
s 125dB SPL maximum output
s Three-terminal electrical connection
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80 2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20μPa
EP SERIES – Balanced Armature Amplified Speaker 6.32 x 4.29 x 2.99 (mm)
Based on Knowles’ versatile and popular ED speaker, the EP series adds the benefits of
an internal Class-D amplifier. Its compact size and appreciable output power make the EP
speaker suitable for a variety of designs.
s Round package facilitates earphone designs
s Drop-in upgrade for moving coil dynamic speakers
s Designed for high volume production
s Balanced armature technology
FREQUENCY (Hz)
140
120
100
80
60
40
20
0
SR SERIES – Balanced Armature Speaker 6.40 DIA x 4.00 (mm)
At 6.4mm diameter, the Mini SR is the smallest round balanced armature speaker in
the marketplace. SR offers output equivalent to the FC series and maximizes
bass performance.
EC SERIES – Balanced Armature Speaker 7.57 x 4.31 x 3.67 (mm)
EC Series speakers are commonly used in isolating earphones for radio communication.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL)
EP-24075-000 12C 106 114
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
SR-6438NWS-000 Face 109.5 120 25 36.5
SR-6438NWS-158 Face 109.5 120 25 32.8
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
EC-23097-000 12S 108 120 92 200
EC-23098-000 12S 108 120 196 425
EC-26368-000 12S 108 120 26.3 54
EC-23095-A33 12S 105 120 376 800
www.knowles.com 21
BALANCED ARMATURE SPEAKERS
10 100 1000 10000 100000
OUTPUT (dB SPL)
SR6438NWS-000 into IEC711 coupler, V_RMS=0.100V*
Note: All performance curves are typical *Note: Chart for reference only to show performance
with insert earphone coupler
sUltra-thin
sWideband output
sDTEC combines two TEC elements
s Enables small multi-element designs
s Dual elements with single sound port
s More output than BK in equal package size
sReduced vibration compared to BK
s Improved frequency response compared to BK
DTEC SERIES – Balanced Armature Speaker 7.87 x 4.09 x 5.59 (mm)
The DTEC Series combines two TEC speakers with a single round port.
Case size is equivalent to BK/EF. DTEC provides increased output and reduced
vibration compared to a single speaker.
TEC SERIES – Balanced Armature Speaker 7.87 x 4.09 x 2.79 (mm)
The TEC combines output comparable to the larger BK speaker in an ultra-thin package.
The TEC is suitable for multi-element earphone designs.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
TEC-30033-000 12C 115 119 22 31
TEC-30087-000 12C 115 119 46 62
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
DTEC-30008-000 12S 123 122.5 23 31.5
HODTEC-31230-000 12S 120 122.2 26.5 40.7
HODTEC-31516-000 25 120 122.5 102 171
HODTEC-31618-000 12C 119 115.5 8.6 21.8
22 www.knowles.com
BALANCED ARMATURE SPEAKERS
130
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
130
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL)
OUTPUT (dB SPL)
*Note: Chart for reference only to show performance
with insert earphone coupler
TEC-30033-000 into IEC711 coupler, V_RMS=0.109V*
DTEC-30008-000 into IEC711 coupler, V_RMS=0.154V*
s(IGHEFlCIENCYANDLOWDISTORTION
s6ARIOUSPORTLOCATIONSCOILIMPEDANCESDAMPINGOPTIONS
TERMINALCONlGURATIONSANDFREQUENCYRESPONSESAVAILABLE
BK SERIES – Balanced Armature Speaker 7.87 x 5.59 x 4.01 (mm)
BK Series speakers provide broadband performance at value pricing. They are commonly
used for full range in-ear speakers and communications utilizing an earplug design.
GD SERIES – Balanced Armature Speaker 5.99 x 3.10 x 2.59 (mm)
The GD is a two-way balanced armature system with high output capabilities
for professional in-ear applications. Enables customized cross-over response
to achieve target frequency response.
s(IGHPERFORMANCELOWPROlLE
TWOWAYSYSTEM
s#USTOMIZABLECROSSOVERCAPABILITIES
s$UALPORTEDTOMECHANICALLYTUNE
EACHDRIVER
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
BK-21600-000 12S 123 125 100 285
BK-21604-000 12S 123 125 895 2320
BK-21610-000 12S 121 126 21 60
BK-21613-000 1S 118 125 160 450
BK-21615-000 12S 118 125 160 450
BK-21669-000 12C 123.5 125 9 22
BK-23134-000 12S 118 125 100 285
BK-26824-000 12S 119 120 10.7 16
BK-28507-000 12S 126 126 10.7 13.3
BK-28510-000 12S 123 127 111 320
BK-28562-000 12S 123 124 18.5 23
BK-29725-000 12S 118 119 100 285
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
GD-31475-000 12S 98.5 106.5 33.5 38.7
www.knowles.com 23
BALANCED ARMATURE SPEAKERS
130
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
120
115
110
105
100
95
90
85
80
75
70
65
60
55
50
45
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL) OUTPUT (dB SPL)
BK-26824-000 into IEC711 coupler, V_RMS=0.075V*
GD-31133-000 into IEC711 coupler, V_RMS=0.172V*
*Note: Chart for reference only to show performance
with insert earphone coupler
s4WOTERMINALZEROBIASANDTHREETERMINAL
CENTERTAPPEDCONlGURATIONS
s6ARIOUSPORTLOCATIONSCOILIMPEDANCES
TERMINATIONCONlGURATIONSANDFREQUENCY
RESPONSESAVAILABLE
s"ALANCEDARMATUREMAGNETICTECHNOLOGYTOGIVEHIGHEFlCIENCY
STABILITYANDRELIABILITY
s(IGHACOUSTICEFlCIENCYENABLESSUFlCIENTSOUNDOUTPUTEVEN
WHENLIMITEDPOWERISAVAILABLE
s)NBUILTSTATICPROTECTION
s,IGHTWEIGHTMATTBLACKPLASTICHOUSING
s%RGONOMICALLYDESIGNEDWITHROUNDEDEDGETOlTTHECONCHA
s(IGHQUALITYSOUNDOUTPUT
s4AILOREDBANDWIDTHFORSUPERBSPEECHINTELLIGIBILITY
SENSITIVITY IN dB SPL
FREQUENCY (Hz)
125
115
105
95
85
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
10k
100 1k
CM SERIES – Balanced Armature Speaker 8.38 x 16.64 DIA (mm)
The CM Series delivers the benefits of balanced armature technology in a compact
finished package. The CM is ideal for use in situations where a non-contacting headset
is required, but signal voltage is limited – as is common for radios and wireless
telephones. The CM also conserves battery power, and provides static shock protection
for the user.
CI SERIES – Balanced Armature Speaker 9.47 x 7.18 x 4.10 (mm)
Knowles’ largest and most powerful speaker, the CI series is the speaker of choice.
With its high efficiency and a 143dB SPL maximum output, the CI speaker provides
optimal low frequency performance.
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
CI-22748-000 12C 125 128 75 250
CI-22762-000 1S 125 128 51 175
CI-22955-000 12C 125 128 20 68 @ 1kHz
CI-22960-000 12C 125 128 100 400
CI-28487-000 1S 125 128 24 100 @ 1kHz
CI-28597-000 11S 125 128 20 68 @ 1kHz
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
CM-23152-000 Face 103 109 69 150
CM-23299-000 Face 103 109 69 150
CM-28421-000 Face 103 109 100 360
CM-28431-000 Face 103 109 10.5 30
CM-28452-000 Face 103 109 100 360
24 www.knowles.com
BALANCED ARMATURE SPEAKERS
140
130
120
110
100
90
80
70
60
50
40
10 100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT (dB SPL)
*Note: Chart for reference only to show performance
with insert earphone coupler
CI-22955-000 into IEC711 coupler, V_RMS=0.176V*
Note: All performance curves are typical
s Excellent sound quality
sHigh speech intelligibility, stability, and reliability
sSuitable for PCB mounting
sCan function as a microphone or beeper
sVarious impedances
sFace and edge port locations available
SENSITIVITY IN dB SPL
FREQUENCY (Hz)
90
80
70
60
50
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
10k
100 1k
sHighly waterproof – no loss of performance after
immersion in 15m water
sCorrosion resistant
sWithstands explosive decompression
sDesign proven in rugged environments
sLeads attached
sHigh resistance to mechanical shock
sAcoustically transparent bellows
s Resists effects of mud, sand, and salt encrustation
SENSITIVITY IN dB SPL
FREQUENCY (Hz)
125
115
105
95
85
2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
MR-23333-000 Face 100 119.5 10 21
Model Port Location Sensitivity @
1kHz (dB SPL)
Sensitivity @
1st Peak (dB SPL) DC Resistance (Ohms) Impedance @ 500 Hz (Ohms)
CB-22849-000 Edge 73 86 11.5 24
CB-22850-000 Edge 73 86 21.5 48
CB-23817-000 Edge 83 97 21.5 48
MR SERIES – Waterproof Speaker 22.12 DIA x 9.3 (mm)
The MR Series Assemblies consist of a speaker element attached to a waterproof
bellows assembly. They may be panel mounted, and are suitable for outdoor use
or repeated submersion.
CB SERIES – Balanced Armature Speaker 25.15 x 25.15 x 9.65 (mm)
The CB Series Transceiver offers high electro-acoustic efficiency to conserve power in
push-to-talk radio handsets and other battery operated equipment. The CB is available
with mounting pins to facilitate assembly to a PC board. Model CB-23817-000 is designed
to survive submersion in water.
www.knowles.com 25
BALANCED ARMATURE SPEAKERS
Note: All performance curves are typical
GA SERIES – Microphone
Omni-Directional 2.00 x 2.00 x 4.00 (mm)
The GA Series Microphone is a brand new microphone design with
unique size and shape. Its elongated 2mm x 2mm x 4mm dimensions
are ideal for directional applications, allowing you ultimate flexibility in
terminal pad area placement. And the GA is using the new ‘38’ circuit
providing excellent sensitivity and noise performance for package size.
The GA targets space efficiency in BTE and ITE designs; BTE: End-to-end
configuration provides 8mm spacing for directionality while ITE: 20%
smaller cross sectional area than FG Series.
s Compact size providing superior fit rates (2mm x 2mm x 4mm)
s Excellent sensitivity and noise performance for package
s Integral RFI suppression
s Exceptionally low vibration sensitivity
s Multiple acoustic port placement versions
ELECTRET MICROPHONES
Hundreds of design possibilities can be applied to your product challenge with our
electret microphone designs. Ideal for new product ideas that require premium audio
and very small form factors, solutions include noise canceling, omni-directional
and unidirectional performance. Other variables include size, shape, amplification,
sensitivity, low noise, and resistance to vibration and mechanical shock. Our products
are designed into high value applications in markets such as the following:
s Communications – headsets, handsets, earpieces, telephony, voice recognition, emergency services,
surveillance, radio
s Pro audio – in-ear speakers, lapel microphones, boom microphones
s Medical and more – sensors, audiometers, medical implants
Electret Microphones
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-40dB
-45
-50
-55
-60
-65
-70
-75
- 0
1k 10k100
20
3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 2
Model Sensitivity @ 1kHz
(dB re1V/0.1Pa) DC Supply (Vdc) Max. Amplifier
Current Drain (uA)
Typical “A” Weighted
Noise (1 kHz
Equivalent SPL)
Nominal Output
Impedance (Ohms) Comments
GA38-30775-000 -53.0±3 1.3 nom. 1.6 max 25 2 5.0 dB 4400 Tubeless
GA38-30870-000 -53.0±3 1.3 nom. 1.6 max 25 25.0 dB 4400 Micro-Tube Version
Note: All performance curves are typical Note: All performance curves are typical
26 www.knowles.com
Note: All performance curves are typical www.knowles.com 27
sSmallest microphone option
sHigh resistance to mechanical shock
sExceptionally low vibration sensitivity
sVarious responses available
sIntegral RFI suppression
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
sHigh resistance to mechanical shock
sImproved RFI and EMI
sUndamped, screen damped, and internally damped responses
sNumerous port locations
sWide range of frequency responses
-40
-50
-60
-70
-80 2 3 4 5 6 7 8 9
100 10k
1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-40
-50
-60
-70
-80
2 3 4 5 6 7 8 9
100 1k 10k
2 3 4 5 6 7 8 9
Model Sensitivity @ 1kHz
(dB re1V/0.1Pa) DC Supply (Vdc) Max. Amplifier
Current Drain (uA)
“A” Weighted Noise
* 1kHz Equivalent SPL
** re 1Vrms
Nominal Output
Impedance (Ohms) Comments
FG-23329-D65 -53.0±3 1.3 nom. 3.0 max 50 30.0 dB* 4400 RFI Improved Version
FG-23329-P07 -53.0±3 1.3 nom. 3.0 max 50 30.0 dB* 4400 3-Wire, 1015mm Shielded Cable
FG-23629-P16 -53.0±3 1.3 nom. 3.0 max 50 28.0 dB* 4400 3-Wire, 25.4mm Litz Wires
FG-23629-D65 -53.0±3 1.3 nom. 3.0 max 50 28.0 dB* 4400 RFI Improved Version
FG-23652-D65 -53.0±3 1.3 nom. 3.0 max 50 28.0 dB* 4400 RFI Improved Version
FG-23652-P16 -53.0±3 1.3 nom. 3.0 max 50 28.0 dB* 4400 3-Wire, 25.4mm Litz Wires
FG-23742-D36 -63.0±3 1.3 nom. 3.0 max 50 36.0 dB* 4400 3-Wire, 25.4mm Litz Wires
FG-26163-D65 -58.0±3 1.3 nom. 3.0 max 50 -93.0 dB** 4400 RFI Improved Version
6dB/Octave Ski-Slope
DFG-30344-000 -67.0±3 1.3 nom. 3.0 max 50 -93.0 dB** 700 Directional, Super Cardioid
DFG-30852-000 -69.0±3 1.3 nom. 3.0 max 50 -93.0 dB** 1700 Directional, Cardioid
DFG-30851-000 -73.0±3 1.3 nom. 3.0 max 50 -93.0 dB** 1700 Directional, Noise Canceling
Model Sensitivity @ 1kHz
(dB re1V/0.1Pa) DC Supply (Vdc) Max. Amplifier
Current Drain (uA)
“A” Weighted Noise
* 1kHz Equivalent SPL
** re 1Vrms
Nominal Output
Impedance (Ohms) Comments
EM-23046-P16 -56.0±3 1.3 nom. 3.0 max 50 31.0 dB* 4400 3-Wire, 25.4mm Litz Wire
Standard Response
EM-23069-000 -56.0±3 1.3 nom. 1.6 max 50 33.0 dB* 4400 Tubeless
Standard Response
EM-30081-D65 -68.0±3 1.3 nom. 3.0 max 50 -98.0 dB* 4400 12dB/Octave Ski-Slope
EM SERIES – Microphone
Omni-Directional 3.63 x 3.63 x 2.28 (mm)
The EM is a popular, alternative omni-directional microphone/ The EM can also
be used in directional applications as a matched omni-directional pair.
ELECTRET MICROPHONES
FG/DFG SERIES – Microphone
Omni-Directional (FG), Directional (DFG) 2.56 DIA x 2.56 (mm)
The FG Series microphone is one of the smallest electret condenser microphones.
Its cylindrical shape and compact size facilitate compact designs. The FG can
also be used in directional applications as a matched omni-directional pair.
EK/EL SERIES – Microphone
Omni-Directional (EK), Unidirectional (EL) 4.00 x 5.59 x 2.28 (mm)
EK omnidirectional microphones provide a unique combination of size, performance
and value. Its high electroacoustic sensitivity and low noise make this microphone
an excellent choice for applications where space allows. These popular microphones
are available in many model varieties.
NR SERIES – Microphone
Noise Canceling 4.00 x 5.59 x 2.28 (mm)
The NR Series close talking microphones deliver state-of-the-art noise canceling performance.
NR microphones are used as headset microphones in the most demanding communication
and speech recognition environments. The NR Series microphones are available in boom
microphone packages. (See the Specialty Transducers - Booms & Sensors section for details.)
sIntegral FET amplifier
sDiaphragm responds to pressure differential giving
high rejection of background noise
sWithstands severe environmental conditions
sLow vibration sensitivity
sHigh electoacoustical sensitivity
sSuperior noise canceling performance
sLead attachment available
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
sHigh resistance to mechanical shock
sAvailable with RFI suppression
sVarious port locations available
sWide range of frequency responses
sHigh S/N performance
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-40
-50
-60
-70
-80
2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
5 6 7 9
-40
-50
-60
-70
-80 2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
Model Sensitivity @ 1kHz
(dB re1V/0.1Pa) DC Supply (Vdc) Max. Amplifier
Current Drain (uA)
“A” Weighted Noise
* 1kHz Equivalent SPL
** re 1Vrms
Nominal Output
Impedance (Ohms) Comments
EK-23024-C36 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 RFI Improved Version
Standard Response
EK-23024-P07 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 3-Wire, 1 m Shielded Cable
Standard Response
EK-23027-C36 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 RFI Improved Version
Standard Response
EK-23028-C36 -57.0±3 1.3 nom. 10 max 50 -100.0 dB** 4400 RFI Improved Version
6dB/Octave Ski-Slope
EK-23033-C36 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 RFI Improved Version
Broadband Response
EK-23132-000 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 Broadband Response
EK-23133-C36 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 RFI Improved Version
Broadband Response
EK-23142-C37 -53.0±2 1.3 nom. 10 max 50 26.0 dB* 4400 RFI Improved Version
Broadband Response
EL-23078-000 -53.0±2 1.3 nom. 10 max 50 -100.0 dB** 4400 Dual Port Uni-Directional
Model Sensitivity @ 1kHz
(dB re1V/0.1Pa) DC Supply (Vdc) Max. Amplifier
Current Drain (uA)
Max. “A” Weighted
Noise (dBV)
Nominal Output
Impedance (Ohms) Comments
NR-23158-000 -49.0±3 1.3 nom. 10 max 50 -100 4400 3-Wire
NR-23159-000 -65.0±3 1.3 nom. 10 max 200 -100 2500 2-Wire
NR-23160-000 -52.0±3 1.3 nom. 10 max 200 -100 2500 2-Wire
NR-25994-000 -49.0±3 1.3 nom. 10 max 50 -100 4400 3-Wire
NR-25994-D63 -55.0±4 1.3 nom. 10 max 300 -100 2000 2-Wire
NR-30610-D63 -59.0±3 3.0 nom. 10 max 550 -100 2000 2-Wire
ELECTRET MICROPHONES
Note: All performance curves are typical
28 www.knowles.com
Model Sensitivity @ 1kHz
(dB re1V/0.1Pa) Directivity DC Supply (Vdc) Max. Amplifier
Current Drain (uA)
“A” Weighted Noise
* 1kHz Equivalent SPL
** re 1Vrms
Nominal Output
Impedance (Ohms) Comments
WP-23501-000 -54.0±3 Noise Canceling 1.3 nom. 10 max 300 -100 dB** 2500 2-Wire
WP-23502-000 -52.0±3 Omni-Directional 1.3 nom. 10 max 50 26.0 dB* 4400 3-Wire
WP-23502-P07 -52.0±3 Omni-Directional 1.3 nom. 10 max 50 26.0 dB* 4400 3-Wire, w/ 1m
Shielded Cable
WP-23502-P16 -52.0±3 Omni-Directional 1.3 nom. 10 max 50 26.0 dB* 4400 3-Wire, w/ 25.4mm
Litz Wires
WP-23849-C36 -52.0±3 Omni-Directional 1.3 nom. 10 max 50 26.0 dB* 4400 3-Wire, RFI Improved +
Extended Response
WP-25993-D63 -55.0±4 Noise Canceling 1.3 nom. 10 max 300 -100 dB** 2000 2-Wire
ELECTRET MICROPHONES
Note: All performance curves are typical www.knowles.com 29
WP SERIES – Waterproof Microphone
Omni-Directional, Noise Canceling 3.99 x 5.56 x 2.21 (mm)
The WP Series’ form factor is a very small size with low vibration sensitivity.
The excellent noise canceling performance is useful for sensors and instrumentation.
The WP Series are available in boom microphone packages. (See the FB Series for details.)
MR SERIES – Waterproof Microphone
Omni-Directional
The MR Series Assemblies consist of a microphone element attached to a
bellows assembly. They may be panel mounted, attached for boom applications,
and are suitable for outdoor use or repeated submersion.
s(IGHLYWATERPROOFnNOLOSSOFPERFORMANCEAFTERIMMERSION
INMWATER
s#ORROSIONRESISTANT
s7ITHSTANDSEXPLOSIVEDECOMPRESSION
s$ESIGNPROVENINRUGGEDENVIRONMENTS
s#ABLEWIREATTACHED
s(IGHRESISTANCETOMECHANICALSHOCK
s!COUSTICALLYTRANSPARENTBELLOWS
s2ESISTSEFFECTSOFMUDSANDANDSALTENCRUSTATION
s7ATERPROOFEDTOSUBMERSIONINMWATER
s#LOSETALKINGNOISECANCELING
s#ORROSIONRESISTANT
s7ITHSTANDSEXPLOSIVEDECOMPRESSION
s%XCELLENTENVIRONMENTALPERFORMANCE
s(IGHRESISTANCETOMECHANICALSHOCK
FREQUENCY (Hz)
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-35
-45
-55
-65
-75
2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
-40
-50
-60
-70
-80
2 3 4 5 6 7 8 9
10k100 1k
2 3 4 5 6 7 8 9
Model Dimensions
(mm)
Sensitivity @ 1kHz
(dB re1V/0.1Pa) DC Supply (Vdc) Max. Amplifier
Current Drain (uA) “A” Weighted Noise Nominal Output
Impedance (Ohms) Comments
MR-23151-000 22.12 DIA x 9.3 -87.0±3 N/A N/A 30.0 dB** 300 2-Wire, 193mm Leads
MR-23793-000 22.12 DIA x 11.43 -60.0±4 1.3 50 31.0 dB* 2500 3-Wire, 201mm Leads
MR-28406-000 22.12 DIA x 7.6 Omni--60.0±3 1.3 50 30.0 dB* 3500 3-Wire, 202mm Leads
www.knowles.com
MICROPHONES
Note: All performance curves are typical
30 www.knowles.com
BJ SERIES – Electromagnetic Microphone
Omni-Directional, Noise Canceling 7.87 x 5.59 x 4.01 (mm)
Knowles’ Magnetic Microphones (BJ Series) are based on balanced armature
technology and are self-shielded against external magnetic fields. The
microphones offer high efficiency, stability, and reliability and are small in size.
The diaphragm of the BJ Series responds to pressure differential, giving high
rejection of background noise. Both face and edge ports are offered. In addition,
there is a short distance between front and back ports resulting in improved
noise rejection up to higher frequencies.
BL SERIES – Piezoceramic Microphone
Omni-Directional
Knowles’ Piezo Ceramic Microphones (BL Series) are rugged, stable and versatile.
BL microphones are available in three different package sizes: standard, thin or
0.5” cylindrical shell and cable assembly. Both communication and broadband
frequency response versions are offered. In addition, BL microphones have high
vibration sensitivity and may be used as accelerometers.
s(IGHSENSITIVITY
s7IDEFREQUENCYRANGE
s)NTEGRAL&%4AMPLIlER
s(IGHRESISTANCETOMECHANICALSHOCK
s6ARIOUSRESPONSES
s4WOCASESIZESAVAILABLE
s"ALANCEDARMATURETECHNOLOGY
s(IGHEFlCIENCYSTABILITYANDRELIABILITY
s3ELFSHIELDEDAGAINSTEXTERNALMAGNETIClELDS
s&ACEANDEDGEPORTS
s$IAPHRAGMRESPONDSTOPRESSUREDIFFERENTIALGIVINGHIGH
REJECTIONOFBACKGROUNDNOISE
s3HORTDISTANCEBETWEENFRONTANDBACKPORTSRESULTINGIN
IMPROVEDNOISEREJECTIONUPTOHIGHERFREQUENCIES
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-55dB
-60
-65
-70
-75
-80
-85
-90
-95 2 3 4 5 6 7 8 9
10k100 1k
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-35dB
-40
-45
-50
-55
-60
-65
-70
-75
2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
Model Directivity Port Location Nominal Impedance
at 1kHz (Ohms)
Nominal DC Resistance
at 20˚ C (Ohms)
BJ-21590-000 Omni-Directional OJn 3900 900
BJ-28411-000 Noise Canceling Dual 300 75.5
Model Dimensions
(mm)
Sensitivity @ 1kHz
(dB re1V/0.1Pa)
DC Supply
(Vdc)
Max. Amplifier
Current Drain (uA)
“A” Weighted Noise Nominal Output
Impedance (Ohms) Comments
BL-21671-000 7.87 x 5.54 x 4.06 -54.0±3 1.3 50 32.0 dB 13000 Standard Response
BL-21671-140 7.87 x 5.84 x 4.06 -54.0±4 1.3 50 32.0 dB 13000
Faster Overpressure Recovery
Standard Response
BL-21785-000 7.87 x 5.54 x 2.24 -69.0±3 3 160 34.0 dB 4000 Broadband Response
BL-21994-000 25.5 -69.0±3 3 160 34.0 dB 4000 965mm Shielded Cable
Broadband Response
BL-23497-000 25.5 -69.0±3 3 160 34.0 dB 4000 34.3mm Leads Broadband
Response
BL-27046-000 7.87 x 5.54 x 2.24 -69.0±3 1.3 160 34.0 dB 4000 Broadband Response
Knowles boom microphones are designed for either flexible or rigid configurations
and offer such performance options as noise rejection and high-frequency crossover
of near and far field responses. Lengths and end terminations may be customized to
meet your application needs. Knowles packaged microphones are suitable for sensor
and outdoor use.
s Standard and waterproof
sFlexible and rigid styles
sBoom housing available in plastic and metal
sCustomized lengths and end terminations
Booms & Sensors
Part Numbering
FB-F I -30026-000
1
Product Description
FB: Flexible Boom
2
Boom Diameter
A: 2.3mm OD Positionable Cable
B: 2.7mm OD Gooseneck (w/shrink tube)
D: 4.2mm OD Gooseneck (w/shrink tube)
E: 5.4mm OD Gooseneck (w/shrink tube)
F: 5.9mm OD Gooseneck (w/shrink tube)
H: 5.0mm OD Gooseneck (w/shrink tube)
M: 1.0mm OD Positionable Tube
3
Head Series
I: BJ Housing
M: NR/WP Waterproof Housing
O: Cyilnder Housing
U: FG/DFG Micro Housing
W: Plastic Housing w/ Sinter Disc
4
Model #
3 412
VWP-F-30109-000
1
Product Description
V: Value Added
2
Element Series
EK, EA, WP
3
Housing Series
B: Over Molded
C: Custom Design
F: Plastic Panel Mount
H: ESD Shielded Plastic
4
Model #
3 412
BOOMS & SENSORS
Note: All performance curves are typical www.knowles.com 31
s Designed for headset customers who are looking for a noise canceling non-powered element in robust platform
with waterproofing options from 1m down to 10m (based on IP67 rating)
– Also available in Omni-Directional
sPlastic head design with metal flexible boom
– Available in 5.9mm down to 4.2mm diameter metal flexible boom
s Tactical, Security and Police and other radio communication headsets
– Mounted and un-mounted ground forces, armor units
s Designed for the BJ series elements
I SERIES
s Designed for headset customers who are looking for a noise canceling electret element in robust waterproof housing
– Available in Omni-Directional
– Waterproof options from 1m down to 20m (per IP67, IP68)
s Plastic head design with metal flexible boom
– Available in 6.0mm down to 2.7mm diameter metal flexible boom
s Tactical, Security, Fire and Police and other high end radio communication headsets
– Over the ear, earcup or helmet designs
s Designed for EK, NR and WP series elements
M SERIES
Model *Rating Microphone
Element Directivity Boom Length
Tip-To-Tip (mm)
Exit Wire Length
(mm)
Nominal Boom
Diameter (mm)
Microphone
Configuration
FB-EI-30026-000 1m BJ-28471-000
(150ΩImpedance) Noise Canceling 172 60 5.4 2-Wire
FB-EI-30426-000 1m BJ-28486-000
(30ΩImpedance) Noise Canceling 172 60 5.4 2-Wire
*Rating done to IP67 test criteria
Model *Rating † Microphone
Element Directivity Boom Length
Tip-To-Tip (mm)
Exit Wire Length
(mm)
Nominal Boom
Diameter (mm)
Microphone
Configuration
FB-EM-30342-000 1m NR-25994-D63 Noise Canceling 167 60 5.4 2-Wire
FB-EM-30343-000 3m WP-25993-D63 Noise Canceling 167 60 5.4 2-Wire
FB-EM-30344-000 10m NR-25994-D63 Noise Canceling 167 60 5.4 2-Wire
FB-EM-30345-000 20m NR-25994-D63 Noise Canceling 167 60 5.4 2-Wire
FB-EM-30346-000 1m EK-23132-C36 Omni-Directional 167 60 5.4 2-Wire
FB-EM-30348-000 10m EK-23132-C36 Omni-Directional 167 60 5.4 2-Wire
FB-EM-30349-000 20m EK-23132-C36 Omni-Directional 167 60 5.4 2-Wire
*Rating done to IP67 test criteria † WP-Series elements are waterproof
Note: All performance curves are typical
32 www.knowles.com
BOOMS & SENSORS
Note: All performance curves are typical www.knowles.com 33
s Designed for headset customers who are looking for a noise canceling electret element in a metal EMI shielded housing
– Available in Omni-Directional
– Waterproof options down to 3m using WP elements
s Metal head design with metal flexible boom
– Available in 8.0mm down to 4.2mm diameter metal flexible boom
s Tactical, Security, Fire and Police and other radio communication headsets
– Over the ear, earcup or helmet designs
s Designed for EK, NR and WP element series
O SERIES
s Designed for headset customers who are looking for small footprint and lightweight platform with waterproofing to 1m (based on IP67 rating)
s Plastic head design with metal flexible boom
– Available in 4.2mm down to 2.7mm diameter metal flexible boom
s Security, Police, Fire dispatchers and other lightweight communication headsets
s Designed for the NR and WP elements, but can also accommodate EK and EA series
W SERIES
Model *Rating † Microphone
Element Directivity Boom Length
Tip-To-Tip (mm)
Exit Wire Length
(mm)
Nominal Boom
Diameter (mm)
Microphone
Configuration
FB-DO-23511-000 3m WP-23501-000 Noise Canceling 142 150 4.2 2-Wire
FB-DO-25946-000 3m WP-23501-000 Noise Canceling 54 30 4.2 2-Wire
FB-HO-25624-000 3m WP-23501-000 Noise Canceling 142 160 5.0 2-Wire
FB-FO-25581-000 N/A EK-23024-000 Omni-Directional 104 140 5.9 2-Wire
*Rating done to IP67 test criteria † WP-Series elements are waterproof
Model *Rating † Microphone
Element Directivity Boom Length
Tip-To-Tip (mm)
Exit Wire Length
(mm)
Nominal Boom
Diameter (mm)
Microphone
Configuration
FB-DW-30294-000 3m WP-25993-D63 Noise Canceling 140 60 4.2 2-Wire
FB-BW-30335-000 3m WP-25993-D63 Noise Canceling 160 60 2.7 2-Wire
FB-DW-30296-000 3m WP-25993-000 Noise Canceling 140 60 4.2 3-Wire
FB-DW-30293-000 IP54 ‡ NR-25994-D63 Noise Canceling 140 60 4.2 2-Wire
FB-BW-30330-000 IP54 ‡ NR-25994-D63 Noise Canceling 160 60 2.7 2-Wire
FB-DW-30295-000 IP54 ‡ NR-25994-000 Noise Canceling 1607 60 4.22 3-Wire
*Rating done to IP67 test criteria † WP-Series elements are waterproof ‡ Splashproof meeting IP54 test criteria
BOOMS & SENSORS
s Designed for ruggedized panel mounted applications for outdoor microphone and sensor applications
– Available in Omni Directional
– Waterproof options from 1m down to 20m (per IP67, IP68)
s Designed for the EK, NR and WP elements series
s Designed for ruggedized fixed position and mounted applications for outdoor sensor arrays
– Available in Omni Directional
– Waterproof options from 1m down to 20m (per IP67, IP68)
s Conductive plastic shielding housing with shielded cable assembly
– Available with extra high SPL circuit design
– Custom PCBA options available within the housing cavity
s Designed for EK, NR, GH and WP series elements
H SERIES
Model *Rating Microphone
Element Directivity Exit Wire Length
(mm) Sensor Diameter (mm) Microphone
Configuration
VEK-F-30350-000 1m EK-23132-C36 Omni-Directional 200 16 3-Wire
VEK-F-30351-000 10m EK-23132-C36 Omni-Directional 200 16 3-Wire
VEK-F-30352-000 20m EK-23132-C36 Omni-Directional 20 16 3-Wire
VEK-F-30460-000 1m EK-23132-C36 Omni-Directional 10 16 3-Wire
VEK-F-30300-000 20m EK-23132-C36 Omni-Directional 8 16 3-Wire
*Rating done to IP67 test criteria
Model *Rating Microphone
Element Directivity Sensor Length
(mm) Sensor Diameter (mm) Exit Wire
Length (mm)
Microphone
Configuration
VWP-H-30109-000 3m WP-30113-P03 Omni-Directional 21 12.7 211 3-Wire
VEK-H-30320-000 1m EK-23169-P03 Omni-Directional 21 12.7 211 3-Wire
VEK-F-30352-000 1m EK-26899-P03 Omni-Directional 21 12.7 211 3-Wire
*Rating done to IP67 test criteria † WP-Series elements are waterproof
Note: All performance curves are typical
34 www.knowles.com
BOOMS & SENSORS
F SERIES
Note: All performance curves are typical www.knowles.com 35
BU SERIES – Accelerometer 7.87 x 5.54 (mm)
BU Series Accelerometers are frequently used as contact microphones for radio
communications in high noise environments. The accelerometers reproduce voice signals
from vibrations at the throat or from bony parts of the head, and are compatible with
helmet or headset applications.
BF Series – Acoustic Damper Screens
Dampers are acoustic cloth screens for insertion inside acoustic tubing.
These damping elements are used between the speaker outlet and the ear canal
to smoothen the frequency response.
SENSITIVITY IN dB RELATIVE TO 1.0V/G ACCELERATION
FREQUENCY (Hz)
-25
-35
-45
-55
-65
2 3 4 5 6 7 8 9 10k100 1k
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
ACCELEROMETERS & ACOUSTIC DAMPERS
s3MOOTHENANDSHAPEFREQUENCYRESPONSE
s6ARIOUSACOUSTICALRESISTANCESANDSIZES
s#ERAMICVIBRATIONTRANSDUCER
s(IGHVIBRATIONSENSITIVITY
s3MALLSIZE
s7IDEFREQUENCYRANGE
s)NTEGRAL&%4AMPLIlER
s(IGHRESISTANCETOMECHANICALSHOCK
s7ITHSTANDSSEVEREENVIRONMENTALCONDITIONS
Model Thickness Sensitivity @1
KHz (dB re 1Vg) DC Supply (V) Max. Current
Drain (uA)
Nominal Output
Impedance
@1 KHz (Ohms)
“A” Weighted
Noise (dBre. 1V)
BU-21771-000 4.06 -45.0±4.5 1.5 50 5200 -103
BU-23173-000 4.06 -39.0±4.5 1.5 50 5200 -103
BU-23842-000 2.24 -40.0±4.0 1.5 50 5200 -103
BU-27135-000 2.24 -45.0±4.5 1.5 300 5200 -103
Model Thickness NominaL Acoustic
Resistance (Ohms) PLUG (mm) SCREEN (mm)
BF-1859-000 White 680 2.08 --
BF-1860-000 Brown 1000 2.08 --
BF-1861-000 Green 1500 2.08 --
BF-1921-000 Red 2200 2.08 --
BF-1922-000 Orange 3300 2.08 --
BF-1923-000 Yellow 4700 2.08 --
BF-1988-000 White 680 -- 1.12
BF-1991-000 Green 1500 -- 1.12
BF-1995-000 Red 2200 -- 1.12
BF-1997-000 White 680 -- 1.78
BF-1999-000 Grey 330 2.08 --
BF-3034-000 Grey 330 -- 1.78
BF-3035-000 Brown 1000 -- 1.78
BF-3036-000 Orange 3300 -- 1.78
BF-3037-000 Red 2200 -- 1.78
BF-3038-000 Green 1500 -- 1.78
BF-3039-000 Green 1500 -- 1.37
BF-3163-000 Yellow 4700 -- 1.12
ACOUSTIC SOFTWARE
INTELLISONIC™
The intelligibility and use of mobile communications
are often impeded by the impact of noise from the
immediate environment. IntelliSonic is a software-based
speech enhancement technology that when coupled
with Knowles’ microphones, reduces the effects of
reverberation, directionally interfering speech,
background noise and annoying acoustic echo.
COMPLETE SOLUTION – Integrated Systems
When you consider the interdependency of microphone design, acoustic porting, and sound signal conditioning, it’s easy to see why Knowles
Acoustics has taken an integrated approach to your acoustic system needs.
sVoIP Telephony
sCommand and Control
sVoice recognition
sDictation
APPLICATIONS
Platforms such as tablets, laptops, ultra-mobile personal computers (UPCs), and other mobile computing devices have a number of applications that
would benefit from IntelliSonic to enhance the user experience and final product perception.
PRODUCT MATRIX
sLanguage Translation
sVoice Annotation
sAudio Note Taking
sNoise suppression 12dB-16dB
sInterference cancellation via beam-formin g array 25dB
sAcoustic echo cancellation 25dB
sSpeech bandwidth 8kHz
sAdjustable acceptance and look angles
sFully adaptive system adapts to changing
acoustic environment
sRich application programming interface (API) set
sReal-time processing
sLow speech distortion
SUPPORTED PLATFORMS (OS Support)
IntelliSonic™ Attenuates Unwanted Sounds
(Visual output of recordings using same microphone)
Unprocessed
Signal
Using
IntelliSonic™
FEATURES
Product Code # of
Microphones Noise Reduction Array Processing Echo Cancellation
DXEC01 1 ✓–✓
DXEC02
2
✓✓ ✓
OS Model Codec
Microsoft Windows XP/2000 WDM Upper Filter AC’97 and HDAudio
Microsoft Windows 7/Vista WaveRT APO AC’97, HDAudio and USBAudio
Microsoft Windows Mobile and its Derivatives Static library or integrated into codec driver binary (requires customization)
36 www.knowles.com
SiSonic™ MEMS Microphones
TECHNOLOGY BASICS
37
www.knowles.com
PORT HOLE
ENCAPSULATION
MEMS ASIC
LID
PCB BASE
DIAPHRAGM
BACKPLATE
BACK CAVITY SILICON SUBSTRATE
SiSonic™ microphones contain a silicon MEMS structure (diaphragm and backplate) and an ASIC (Fig. 1 and Fig. 2). Sound pressure causes the
diaphragm to vibrate relative to the backplate creating a variable voltage. The ASIC buffers the resulting signal for external electrical connection.
For digital SiSonic microphones, the microphone accepts a clock signal and converts the output to a synchronus PDM data format. SiSonic
microphones are designed for surface mount (SMT) attach. The sensitivity of analog SiSonic microphones is measured in units of dBV relative to
1.0 Pascal while digital microphone sensitivity is measured in dBFS relative to 1.0 Pascal.
A charge pump in the ASIC provides a constant bias voltage to the diaphragm of the MEMS when the microphone is powered. This bias voltage
does not degrade with time, temperature, or humidity. In conjunction with the floating diaphragm construction of the MEMS which is fabricated in
standard silicon wafer processes, SiSonic microphones yield constant sensitivity distributions over a wide operating temperature range and after
multiple reflow passes.
Fig. 2: Cross section of a SiSonic MEMS
Fig.1: Cross section of a SiSonic top port microphone
Electret Microphones
Microphones measure sound pressure. Inside a Knowles microphone is a thin flexible diaphragm, an electrically charged plate, and an amplifier
(Fig. 3). The output voltage is proportional to changes in the small separation between the diaphragm and the charged plate (Fig. 4).
As sound pressure inside the front cavity increases, the diaphragm is pushed closer to the plate. As the pressure decreases, it moves further away.
The motion of the diaphragm produces a small electrical signal that is amplified by a miniature circuit inside the microphone.
The sensitivity of a typical Knowles’ microphone is measured in units of dB relative to 1 Volt per 0.1 Pascal.
Fig 3: Cross section of a Knowles EM microphone
Fig. 4: EM diaphragm and electret
CHARGE PLATE
DIAPHRAGM AIR GAP SEPARATION
OUTPUT
TERMINAL
CHARGE PLATE DIAPHRAGM FRONT CAVITY
WIRE
SOUND
PRESSURE
AMPLIFIER
TECHNOLOGY BASICS
38 www.knowles.com
Balanced Armature Speakers
The speaker converts an electrical signal into sound. A cross section of a typical Knowles speaker is shown in Fig. 5. The basic components of the
speaker are: a coil of wire, a metal U-shaped reed called the armature, a pair of permanent magnets, a drive rod, and a diaphragm.
The coil and armature act as an electromagnet. An alternating current in the coil causes the polarity of the armature to switch back and forth from
north to south. The free end of the armature bends slightly up and down as it is attracted alternately to the top and bottom magnets (Fig. 6). The
diaphragm, pulled along by the drive rod, pumps air in and out of the speaker. The mechanical motion of the armature is thus converted into sound.
The sound output of a typical Knowles’ speaker is measured in units of dB SPL (sound pressure level) relative to 20 μPa.
Fig. 5: Cross section of a Knowles EH speaker
INPUT TERMINAL COIL DRIVE ROD DIAPHRAGM
MAGNETS
ARMATURE
Fig. 6: The motor of the speaker has a coil, an armature, and a pair of permanent magnets.
www.knowles.com 39
TECHNOLOGY BASICS
© 2012 Knowles Printed In USA
KA-003-031V6
Globally Positioned
Knowles maintains sales, marketing, engineering and manufacturing globally.
For further information, please visit our website.
www.knowles.com
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Knowles:
EH-23043-000 EH-23048-000 EH-23063-000 FEH-29833-I02 EH-23052-000 EH-23053-000 EH-23061-000 FEH-
23819-I02 EH-23030-000 EH-23050-000 EH-23149-000 EH-23066-000 FEH-27318-I06 EH-23067-000 EH-23054-
000 FEH-26796-I02 EH-23044-000 FEH-26722-I06 FEH-27233-I06 EK-23132-C36 BL-27046-000 DFG-30445-000
DFG-30852-000 FG-23329-D65 EH-27479-000 EH-26367-000 EH-27418-000 EH-27233-000 DFG-30582-000
FEH-27232-I06 EH-27250-000 EH-30854-000 EH-29833-000 EH-27827-000 EH-27822-000 EH-27374-000 DFG-
30581-000 EH-27975-000 EH-27418-111 DFG-30851-000 EH-27157-000 EH-27318-000 EH-27232-000 EH-
29921-000 EH-27478-000 EH-27232-111