MEMS MICROPHONES
SPECIALTY MICROPHONES
BOOMS AND SENSORS
ACCELEROMETERS & ACOUSTIC DAMPER SCREENS
SPECIALTY SPEAKERS
CUSTOM ASSEMBLIES
ACOUSTIC SOFTWARE
MICROPHONE AND SPEAKER BASICS
Acoustic Interface Design Guide 2010
2www.knowles.com
Discover
Knowles Acoustics offers you a full
spectrum of MEMS microphones,
specialty microphones, balanced
armature speakers, custom
assemblies, and sound conditioning
software. This application guide will
help you select the right acoustic
interface solution.
your next acoustic interface solution.
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.
3www.knowles.com
We can help you
every step of the way.
It all starts with your application. Or it starts with an idea you may
have. For support from concept to design to sub-assembly, or any step
along the way, just call us. Or visit us at www.knowles.com
MICROPHONES - MEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
SPECIALTY TRANSDUCERS - MICROPHONES . . . . . . . . . . . . . . . . 7-11
SPECIALTY TRANSDUCERS - BOOMS & SENSORS . . . . . . . . . . . . .12-15
ACCELEROMETERS & ACOUSTIC DAMPER SCREENS . . . . . . . . . . . . . 16
SPECIALTY TRANSDUCERS - SPEAKERS . . . . . . . . . . . . . . . . . . 17-26
CUSTOM ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ACOUSTIC SOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
MICROPHONE AND SPEAKER BASICS . . . . . . . . . . . . . . . . . . . . 29-30
Table of Contents
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MICROPHONES – MEMS
•New MaxRF models eliminate GSM/TDMA burst noise and provide wide-band RF noise suppression
•UltraMini footprint - less than 11.5mm2(SPU Series)
•Slim UltraMini footprint - less than 8.5mm2(SPQ Series)
•Digital mics eliminate analog noise
•Integrated designs with differential or switchable gain
•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 1 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.
Part Numbering
MICROPHONES – MEMS
Model Description Directivity Supply Voltage Sensitivity @1kHz Output Maximum
(min-max) RF Immunity (dB re1V/1Pa) Impedance Current
(Ohms) Drain (mA)
SPUL409HE5H Unity Gain Omni 1.5 to 3.6v Enhanced -42.0 <300 <0.25
SPU0409HD5H Unity Gain Omni 1.5 to 3.6v Standard -42.0 <100 <0.25
SPU0410HR5H Unity Gain Omni 1.5 to 3.6v Max-RF -42.0 <400 <0.25
SPU0414HR5H Amplified Omni 1.5 to 3.6v Max-RF -22.0 <400 <0.35
5
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Note: All performance curves are typical
•New Ultra Mini with footprint of 11mm2
•Flexible designs available with/without RF filtering
and built in amplifier
•Ideal for miniature consumer electronics
Ultra Mini Package
Model Description Directivity Supply Voltage Sensitivity @1kHz Output Maximum
(min-max) (dB re1V/1Pa) Impedance Current
(Ohms) Drain (mA)
SPM0404UD5 Unity Gain Omni 1.5 to 3.6v -42.0 <100 <0.25
•High frequency functionality
•Wide range of applications
•Micro-sized sensing and actuation
Ultrasonic Acoustic Sensor
Derived from our industry-leading MEMS silicon surface mount microphone technology,
our new ultrasonic sensor designs function on a high frequency band. Sensor designs
are possible across a wide spectrum of applications requiring highly miniaturized
solutions for sensing and actuation/signaling.
Model Description Directivity Supply Voltage Sensitivity @1kHz Output Maximum
(min-max) RF Immunity (dB re1V/1Pa) Impedance Current
(Ohms) Drain (mA)
SPQ0410HE5H Unity Gain Omni 1.5 to 3.6v Enhanced -42.0 <400 <0.25
•24% reduction of footprint (8.4mm2) from
the Ultra-Mini Package
•Designs available with/without RF Filtering
•Ideal for miniature consumer electronics
Slim-Ultra Mini Package
TYPICAL SENSITIVITY RELATIVE TO 1 kHz (dB)
FREQUENCY (Hz)
20
15
10
5
0
-5
-10
-15
-20
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
10k 100k1k
TYPICAL SENSITIVITY RELATIVE TO 1 kHz (dB)
FREQUENCY (Hz)
20
15
10
5
0
-5
-10
-15
-20
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
1k 10k100
TYPICAL SENSITIVITY RELATIVE TO 1 kHz (dB)
FREQUENCY (Hz)
20
15
10
5
0
-5
-10
-15
-20
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
1k 10k100
6www.knowles.com
Note: All performance curves are typical
Zero Height Mic™SiSonic
STANDARD MOUNT
Zero Height Mic™
•Zero Height Mic™SiSonic shrinks product thickness by up to 30%
•Minimizes distance between PCB and mobile device housing
•Ideal for microphone placement on reverse side of PCB, while maintaining acoustic port on top side of mobile device, for clamshell phone designs
•Enables the thinnest, highest density product designs
Model Description Directivity Supply Voltage Sensitivity @1kHz Output Maximum
(min-max) RF Immunity (dB re1V/1Pa) Impedance Current
(Ohms) Drain (mA)
SPM0404LE5H Unity Gain Omni 1.5 to 3.6v Enhanced -38.0 <200 <0.25
SPM0408LE5H Amplified Omni 1.5 to 3.6v Enhanced -18.0 <200 <0.35
SPM0410LR5H Unity Gain Omni 1.5 to 3.6v Max-RF -38.0 <400 <0.25
SPU0409LE5H Unity Gain Omni 1.5 to 3.6v Enhanced -38.0 <200 <0.25
SPU0410LR5H Unity Gain Omni 1.5 to 3.6v Max-RF -38.0 <400 <0.25
SPK0413LM4H Digital Omni 1.6 to 3.6v Digital -26.0 (dBFS/1Pa) 100pf <0.65
Enhanced Maximum Load
Thin Mini Package
•Thin Mini SiSonic with a footprint less than 18mm2reduces
manufacturing costs and brings greater design flexibility
•Rugged, solid-state design process for stable acoustic
performance under extreme conditions such as temperature,
shock and vibration
•Digital - Pulse Density Modulation (PDM) device available,
which has an integrated sleep mode and is compatible with
stereo input applications
Model Description Directivity Supply Voltage Sensitivity @1kHz Output Maximum
(min-max) RF Immunity (dB re1V/1Pa) Impedance Current
(Ohms) Drain (mA)
SPM0404HD5H Unity Gain Omni 1.5 to 3.6v Standard -42.0 <100 <0.25
SPM0406HE3H Differential Omni 1.5 to 5.5v Enhanced -22.0 <500 <0.50
SPM0407HE3H Switchable Gain Omni 1.5 to 5.5v Enhanced -22.0 <300 <0.37
SPM0408HD5H Amplified Omni 1.5 to 3.6v Standard -22.0 <100 <0.35
SPM0404HE5H Unity Gain Omni 1.5 to 3.6v Enhanced -42.0 <200 <0.25
SPM0405HD4H Digital Omni 1.6 to 3.6v Digital -26.0 (dBFS/1Pa) 100pf <0.60
Standard Maximum Load
SPM0408HE5H Amplified Omni 1.5 to 3.6v Enhanced -22.0 <200 <0.35
SPM0410HR5H Unity Gain Omni 1.5 to 3.6v Max-RF -42.0 <400 <0.25
MICROPHONES – MEMS
TYPICAL SENSITIVITY RELATIVE TO 1 kHz (dB)
FREQUENCY (Hz)
20
15
10
5
0
-5
-10
-15
-20
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
1k 10k100
TYPICAL SENSITIVITY RELATIVE TO 1 kHz (dB)
FREQUENCY (Hz)
20
15
10
5
0
-5
-10
-15
-20
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
1k 10k100
7
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.
•Compact size providing superior fit rates (2mm x 2mm x 4mm)
•Excellent sensitivity and noise performance for package
•Integral RFI suppression
•Exceptionally low vibration sensitivity
•Multiple acoustic port placement versions
SPECIALTY TRANSDUCERS – Microphones
The Specialty Transducer (ST) product line consists of miniature microphones,
speakers, and assemblies. Hundreds of design possibilities can be applied to
your product challenge with our high-performance 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.
ST components and assemblies are unique in fit, form and function. Our products
are designed into high value applications in markets such as the following:
•Communications – headsets, handsets, earpieces, telephony, voice recognition, emergency services,
military, surveillance
•Pro audio – in-ear speakers, lapel microphones, boom microphones
•Medical and more – sensors, audiometers, medical implants
Model Sensitivity @ 1kHz DC Supply (Vdc) Max. Amplifier Max. “A” Weighted Nominal Output
(dB re1V/0.1Pa) Current Drain (uA) Noise (1 kHz Impedance (Ohms) Comments
Equivalent SPL)
GA38-30774-000 -53.0±3 1.3 nom. 1.6 max 25 24.0 dB 4400 Tubeless, Port on Bottom,
Terminal Pads on Cover
GA38-30775-000 -53.0±3 1.3 nom. 1.6 max 25 25.0 dB 4400 Tubeless, Port on End,
Terminal Pads on End
GA38-30776-000 -53.0±3 1.3 nom. 1.6 max 25 25.0 dB 4400 Tube Version
(0.8mm x 0.74mm ID),
Terminal Pads on End
Specialty Transducer Microphones
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Note: All performance curves are typical
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
-40dB
-45
-50
-55
-60
-65
-70
-75
-80
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
8
SPECIALTY TRANSDUCERS – Microphones
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Note: All performance curves are typical
FG/DFG SERIES
– Microphone
Omni-Directional (FG), Directional (DFG) 2.56 DIA x 2.56 (mm)
The FG Series microphone is the world’s smallest electret condenser microphone.
Its cylindrical shape and compact size facilitate compact designs. The FG can
also be used in directional applications as a matched omni-directional pair.
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.
•Smallest microphone option
•High resistance to mechanical shock
•Exceptionally low vibration sensitivity
•Various responses available
•Integral RFI suppression
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
•High resistance to mechanical shock
•Improved RFI and EMI
•Undamped, screen damped, and internally damped responses
•Numerous port locations
•Wide range of frequency responses
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
Sensitivity @ 1kHz Max. Amplifier “A” Weighted Noise Nominal Output
Model (dB re1V/0.1Pa) DC Supply (Vdc) Current Drain (uA) * 1kHz Equivalent SPL Impedance (Ohms) Comments
** re 1Vrms
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
-40
-50
-60
-70
-80 2 3 4 5 6 7 8 9
100 10k
1k
2 3 4 5 6 7 8 9
-40
-50
-60
-70
-80
2 3 4 5 6 7 8 9
100 1k 10k
2 3 4 5 6 7 8 9
Sensitivity @ 1kHz Max. Amplifier “A” Weighted Noise Nominal Output
Model (dB re1V/0.1Pa) DC Supply (Vdc) Current Drain (uA) * 1kHz Equivalent SPL Impedance (Ohms) Comments
** re 1Vrms
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
SPECIALTY TRANSDUCERS – Microphones
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Note: All performance curves are typical
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.)
•Integral FET amplifier
•Diaphragm responds to pressure differential giving
high rejection of background noise
•Withstands severe environmental conditions
•Low vibration sensitivity
•High electoacoustical sensitivity
•Superior noise canceling performance
•Lead attachment available
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
•High resistance to mechanical shock
•Available with RFI suppression
•Various port locations available
•Wide range of frequency responses
•High S/N performance
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
Model Sensitivity @ 1kHz DC Supply (Vdc) Max. Amplifier Max. “A” Weighted Nominal Output
(dB re1V/0.1Pa) Current Drain (uA) Noise (dBV) 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
-40
-50
-60
-70
-80
2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
56789
-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 DC Supply (Vdc) Max. Amplifier “A” Weighted Noise Nominal Output
(dB re1V/0.1Pa) Current Drain (uA) * 1kHz Equivalent SPL Impedance (Ohms) Comments
** re 1Vrms
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
SPECIALTY TRANSDUCERS – Microphones
10 www.knowles.com
Note: All performance curves are typical
BJ SERIES
– 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
– Omni-Directional Microphone
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.
•Balanced armature technology
•High efficiency, stability and reliability
•Self-shielded against external magnetic fields
•Face and edge ports
•Diaphragm responds to pressure differential giving high
rejection of background noise
•Short distance between front and back ports resulting in
improved noise rejection up to higher frequencies
•High sensitivity
•Wide frequency range
•Integral FET amplifier
•High resistance to mechanical shock
•Various responses
•Two case sizes available
Model Dimensions Sensitivity @ 1kHz DC Supply Max. Amplifier Nominal Output
(mm) (dB re1V/0.1Pa) (Vdc) Current Drain (uA) “A” Weighted Noise 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
Model Directivity Port Location Nominal Impedance Nominal DC Resistance
at 1kHz (Ohms) at 20° C (Ohms)
BJ-21590-000 Omni-Directional OJn 3900 900
BJ-28411-000 Noise Canceling Dual 300 75.5
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
10k100 1k
2 3 4 5 6 7 8 9
11www.knowles.com
Note: All performance curves are typical
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 and
PNR/PWP 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.
•Highly waterproof – no loss of performance after immersion
in 15-20 m water
•Corrosion resistant
•Withstands explosive decompression
•Design proven in rugged environments
•Cable wire attached
•High resistance to mechanical shock
•Acoustically transparent bellows
•Resists effects of mud, sand, and salt encrustation
•Waterproofed to submersion in 1m water
•Close-talking (noise-canceling)
•Corrosion resistant
•Withstands explosive decompression
•Excellent environmental performance
•High resistance to mechanical shock
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa
FREQUENCY (Hz)
Model Sensitivity @ 1kHz Directivity DC Supply (Vdc) Max. Amplifier “A” Weighted Noise Nominal Output
(dB re1V/0.1Pa) Current Drain (uA) * 1kHz Equivalent SPL Impedance (Ohms) Comments
** re 1Vrms
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
-35
-45
-55
-65
-75
2 3 4 5 6 7 8 9
10k
100 1k
2 3 4 5 6 7 8 9
-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 Sensitivity @ 1kHz DC Supply Max. Amplifier Nominal Output
(mm) (dB re1V/0.1Pa) (Vdc) Current Drain (uA) “A” Weighted Noise 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 1.3 100 31.0 dB 2500 3-Wire, 201mm Leads
MR-28406-000 22.12 DIA x 7.6 -60.0±3 1.3 50 30.0 dB 3500 3-Wire, 202mm Leads
SPECIALTY TRANSDUCERS – Microphones
12 www.knowles.com
Note: All performance curves are typical
SPECIALTY TRANSDUCERS – Booms & Sensors
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 are customized to meet your
application needs. Marketers of headsets and audio systems often seek Knowles boom
designs. Collaboration with commercial, governmental and industrial designers is
producing new helmet applications for aircraft, military, first responder and high-noise
manufacturing environments.
•Standard and waterproof
•Flexible and rigid styles
•Boom housing available in plastic and metal
•Customized 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: Original Housing
U: FG/DFG Micro Housing
W: Plastic Housing w/ Sinter Disc
4
Model #
Knowles Internal
Reference Only
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 Fixed Housing
H: ESD Shielded Plastic
4
Model #
Knowles Internal
Reference Only
3 412
13
www.knowles.com
Note: All performance curves are typical
SPECIALTY TRANSDUCERS – Booms & Sensors
• Designed for military customers who are looking for a noise canceling non-power element in robust platform with
waterproofing options from 1m down to 10m (based on IP67 rating)
– Also available in Omni-Directional
– Meets MIL-STD-810F standards
• Plastic head design with metal flexible boom
– Available in 5.9mm down to 4.2mm diameter metal flexible boom
•Military forces, Special Operations, Security and Police and other military communication headsets
– Mounted and un-mounted ground forces, armor units
• Designed for the BJ series elements
Model *Rating Microphone Directivity Boom Length Exit Wire Nominal Boom Microphone
Tip-To-Tip (mm) Length (mm) Diameter (mm) Configuration
Element
FB-EI-30026-000 1m BJ-28471-000 Noise Canceling 172 60 5.4 2-Wire
(150ΩImpedance)
FB-EI-30426-000 1m BJ-28486-000 Noise Canceling 172 60 5.4 2-Wire
(30ΩImpedance)
I SERIES
• Designed for military 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 and MIL-STD-810F)
• Plastic head design with metal flexible boom
– Available in 6.0mm down to 2.7mm diameter metal flexible boom
• Military forces, Special Operations, Security, Fire and Police and other high end communication headsets
– Over the ear, earcup or helmet designs for mounted and non-mounted ground forces
• Designed for EK, NR and WP series elements
Model *Rating †Microphone Directivity Boom Length Exit Wire Nominal Boom Microphone
Tip-To-Tip (mm) Length (mm) Diameter (mm) Configuration
Element
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
M SERIES
*Rating done to IP67 test criteria
*Rating done to IP67 test criteria † WP-Series elements are waterproof
SPECIALTY TRANSDUCERS – Booms & Sensors
14 www.knowles.com
Note: All performance curves are typical
•Designed for military 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
•Metal head design with metal flexible boom
– Available in 8.0mm down to 4.2mm diameter metal flexible boom
•Military forces, Special Operations, Security, Fire and Police and other communication headsets
– Over the ear, earcup or helmet designs for mounted and non-mounted ground forces
• Designed for the EK, NR and WP elements series
Model *Rating †Microphone Directivity Boom Length Exit Wire Nominal Boom Microphone
Tip-To-Tip (mm) Length (mm) Diameter (mm) Configuration
Element
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
O SERIES
*Rating done to IP67 test criteria † WP-Series elements are waterproof
Model Rating Microphone Directivity Boom Length Exit Wire Nominal Boom Microphone
Tip-To-Tip (mm) Length (mm) Diameter (mm) Configuration
Element
FB-MU-30774-000 IP51 DFG-30445-000 Uni-Directional 115 18 1.0 2-Wire
(Super-Cardioid)
FB-MU-31024-000 IP51 DFG-30851-000 Noise Canceling 115 18 1.0 2-Wire
FB-MU-31025-000 IP57 VFG-30747-000 Omni-Directional 115 18 1.0 2-Wire
• Designed for Pro-Audio and performance customers who are looking for the lightest directional microphone in an ultra slim housing
• Available in Uni-Directional design
•Metal head design with metal position-able boom
• New 1.0mm diameter design available in multiple colors (flesh tones, black, tan, brown, etc…)
• News Anchors, Referees, professional presenters, performance artists and other high-end communication headsets
• In-ear ultra light design
•Designed for the DFG, VFG & FG elements series
U SERIES
• Designed for customers who are looking for small footprint and lightweight platform with waterproofing to 1m (based on IP67 rating)
• Plastic head design with metal flexible boom
– Available in 4.2mm down to 2.7mm diameter metal flexible boom
• Security, Police, Fire dispatchers and other lightweight communication headsets
– SWAT, SRT, HRT, Bike Patrol, Motorcycle Patrol, Mounted and Marine Patrol, K9 Officer
• Designed for the NR and WP elements, but can also accommodate EK and EA series
W SERIES
Model *Rating †Microphone Directivity Boom Length Exit Wire Nominal Boom Microphone
Tip-To-Tip (mm) Length (mm) Diameter (mm) Configuration
Element
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 140 60 4.2 3-Wire
*Rating done to IP67 test criteria † WP-Series elements are waterproof ‡ Splashproof meeting IP54 test criteria
SPECIALTY TRANSDUCERS – Booms & Sensors
15
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Note: All performance curves are typical
•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 and MIL-STD-810F)
• Police and Military forces, Special Operations, personalized shot detection systems
– Sensor arrays for vibration acoustic signatures and triangulation systems
• Designed for the EK, NR and WP elements series
F SERIES
• Designed for ruggedized fixed position and mounted applications for outdoor sensor arrays for vibration, acoustic signatures and
triangulation systems
– Available in Omni Directional
– Waterproof options from 1m down to 20m (per IP67, IP68 and MIL-STD-810F)
• Conductive plastic housing designed to pass MIL-STD-810F EMI shielding housing with shielded cable assembly
– Available with extra high SPL circuit design
– Custom PCBA options available within the housing cavity
• Military, homeland security, border patrol, Police and local municipality applications
– Electronic fence, ground sensor / vibration sensor technology, human, light and heavy armored vehicle, helicopter sensors
• Designed for EK, NR, GH and WP series elements
Model *Rating †Microphone Directivity Sensor Sensor Exit Wire Microphone
Length (mm) Diameter (mm) Length (mm) Configuration
Element
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-H-30108-000 1m EK-26899-P03 Omni-Directional 21 12.7 211 3-Wire
Model *Rating Microphone Directivity Exit Wire Sensor Microphone
Length (mm) Diameter (mm) Configuration
Element
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
VEK-F-30470-000 1m EK-26899-P58 Omni-Directional 174 (Shielded) 16 3-Wire
H SERIES
*Rating done to IP67 test criteria
*Rating done to IP67 test criteria † WP-Series elements are waterproof
16 www.knowles.com
Note: All performance curves are typical
•Ceramic vibration transducer
•High vibration sensitivity
•Small size
•Wide frequency range
•Integral FET amplifier
•High resistance to mechanical shock
•Withstands severe environmental conditions
SENSITIVITY IN dB RELATIVE TO 1.0V/G ACCELERATION
FREQUENCY (Hz)
Model Thickness Sensitivity @ DC Supply (V) Max. Current Nominal “A” Weighted
1KHz (dB re 1V/g) Drain (uA) Output Impedance Noise (dBre. 1V)
@1 KHz (Ohms)
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
-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
Model Color Nominal Acoustic PLUG (mm) SCREEN (mm)
Resistance (Ohms)
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
•Smoothen and shape frequency response
•Various acoustical resistances and sizes
SPECIALTY TRANSDUCERS – Accelerometers & Acoustic Dampers
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 such as firefighting or combat.
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.
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Note: All performance curves are typical
SPECIALTY TRANSDUCERS – Speakers
TWFK SERIES –
Dual Balanced Armature Speaker 5.00 x 2.73 x 3.86 (mm)
The world’s smallest dual balanced armature speaker, 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.
•High efficiency, stability and reliability
•Customizable performance and port locations
•Ideal for premium in-ear designs
•Component and subassembly solutions
Specialty Transducer Speakers
•Single sound port for simplified earphone design
•Extreme wideband frequency response
•Unique woofer/tweeter combination
•Enables leading-edge earphone designs for miniature size
and performance
Sensitivity @ Sensitivity @ Max SPL @ DC Resistance Impedance @ 500 Hz
Model Port Location 1 kHz (dB SPL) 1st Peak (dB SPL) 1st Peak (dB SPL) (Ohms) (Ohms)
TWFK-30017-000 12S 95 103 113 25 31
2 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20µPa
FREQUENCY (Hz)
110
105
100
95
90
85
80
75
70
10k100 1k
2 3 4 5 6 7 8 9
•Two-terminal zero-bias configuration
•Undamped, screen damped, and internally damped responses
•Wide range of coil impedances
•DFK model is a dual FK
Sensitivity @ Sensitivity @ Max SPL @ DC Resistance Impedance @ 500 Hz
Model Port Location 1 kHz (dB SPL) 1st Peak (dB SPL) 1st Peak (dB SPL) (Ohms) (Ohms)
FK-23451-000 12S 95.5 108.5 118.5 360 450
FK-23466-000 12S 95.5 108.5 118.5 360 450
FK-26260-000 12S 96 105 115.5 135 180
DFK-30041-000 12S 99.7 105.5 115.5 100 133
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)
The world’s smallest balanced-armature speaker, the FK Series is designed
for applications where size is the most important design concern.
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.
18 www.knowles.com
Note: All performance curves are typical
•Undamped, screen damped, internally damped, and Ferrofluid
™
damped responses
•Various port locations, coil impedances, damping options,
termination configurations, and frequency responses available
•Maximum SPL output of 123dB at resonance peak, 109dB
at midband (500Hz)*
Sensitivity @ Sensitivity @ Max SPL @ DC Resistance Impedance @ 500 Hz
Model Port Location 1 kHz (dB SPL) 1st Peak (dB SPL) 1st Peak (dB SPL) (Ohms) (Ohms)
FH-23371-000 12S 100 113 123 60 90
FH-23375-000 12S 100 113 123 240 335
FH-23377-000 12S 100 113 123 515 685
FH-23821-000 12S 100 113 123 125 174
FH-26553-000 12S 100 113 123 60 90
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
10000100 100
SPECIALTY TRANSDUCERS – Speakers
•Lower low/mid-band sensitivity compared to FK Series
•Best high frequency response of any Knowles element
•Combine with low/mid-range speaker for
extended frequency response
•TWFK pairs WBFK with low frequency FK
Sensitivity @ Sensitivity @ Max SPL @ DC Resistance Impedance @ 500 Hz
Model Port Location 1 kHz (dB SPL) 1st Peak (dB SPL) 1st Peak (dB SPL) (Ohms) (Ohms)
WBFK-30000-000 12S 95 105 114 100 111
WBFK-30095-000 12S 91 105 114 12.5 13.5
2 3 4 5 6 7 8 92 3 4 5 6 7 8 9
SENSITIVITY IN dB RELATIVE TO 20µPa
FREQUENCY (Hz)
110
105
100
95
90
85
80
75
70
10k100 1k
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.