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
DONAU11 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
SAMBO13 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
DUMBO13 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($1FACTOR
ANDTUMBLING
LEAN6 x 12 x 2 (mm)
Typical applications: flat phones, hearing aid compatibles, extended range
in hi-leak applications.
Model Sensitivity
(W/m)*
Air Pumping
Capacity f0 Frequency Range (Hz) ** Maximum Sine Power SPL Max
(@ max sine power)***
2403 260 00051 65 dB 20 mm³ 350 Hz 300 - 7000 10 mW 110 dB
Note: Impedance of all receiver devices is typically 32 ohms, all components feature contact springs except where otherwise noted
* average value measured in baffle, subtract 10dB for value in dB/mW/0.1m
** in typical application, at -3dB points after resonance peaks, without EQ correction
*** measured at 1 kHz in 3.2 high leak adapter
Measured in IEC baffle with open back volume (1mW, 10 cm)
s$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 3506 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 HAC6 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 SERIESBalanced 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 SERIESBalanced 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 SERIESBalanced 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 SERIESBalanced 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 SERIESWideband 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