Balanced Armature Products

  • Precision crafting for clear, high-quality audio
  • Low-mass diaphragm for precise sound reproduction
  • Specialized reeds that enable true-to-recording sound, regardless of sound type
  • Separation of instruments for a concert-hall or vinyl-record listening experience
  • Ability to use multiple drivers in each earphone, with each driver delivering sound for specified musical range
  • Small in-ear footprint for added design flexibility
  • Extremely low power consumption
  • More output per cubic millimeter (mm3)

Knowles balanced armature drivers are offered in several configurations, offering maximum flexibility to the designer:

Full-range single drivers (some of which can be used as part of a multi-way assembly)
Pre-assembled multi-way drivers
Tweeters
Woofers

Full-range drivers

  • Knowles full-range Balanced Armature drivers set the standard for bandwidth and clarity in premium earphones and in-ear wearables.
  • The most popular models are represented below. Not seeing what you need? Discuss your requirements with a Knowles field Engineer.
  • Some full-range drivers can also be used as woofer-midrange or midrange-tweeter in a multi-way configuration as indicated in the table.
Model ID Description Imp @ 1kHz (ohms) Sensitivity to 100mV (dB SPL) @ 1kHz Sensitivity to 1mW (dB SPL) @ 1kHz Max SPL 10% THD (dB SPL) @ 1kHz THD @ 94dB SPL @ 1kHz THD @ 100dB SPL @ 1kHz Vented Additional Applications Downloads
BK-26824-000 High output driver especially suited for use with external EQ tuning. 22 114 118 127 0.2 0.2 Yes Midrange-woofer
Download Datasheet Datasheet

(952.92 kB)

Download PDF Tech specs

(197.71 kB)

Download 3D Model 3D models

(1.39 MB)

DWFK-31785-000 Bass-oriented version of TWFK. 30 106 111 120 0.4 0.5 Yes
Download Datasheet Datasheet

(985.12 kB)

Download PDF Tech specs

(152.90 kB)

Download 3D Model 3D models

(4.84 MB)

ED-26805-000 Level sound with high output for its size. 28 109 113 123 0.3 0.3 Yes Midrange-tweeter
Download Datasheet Datasheet

(959.63 kB)

Download PDF Tech specs

(149.06 kB)

Download 3D Model 3D models

(1.17 MB)

ED-31305-163 High impedance driver with warm bass. 84 102 111 119 2.8 3.9 Yes Midrange-woofer
Download Datasheet Datasheet

(839.39 kB)

Download PDF Tech specs

(122.41 kB)

Download 3D Model 3D models

(1.55 MB)

RAB-32033-000 Our smallest full-range driver with open vent, ideal for use with external EQ tuning. 48 104 110 118 1.4 2.0 Yes
Download Datasheet Datasheet

(791.14 kB)

Download PDF Tech specs

(122.05 kB)

Download 3D Model 3D models

(1.55 MB)

RAB-32063-000 Our smallest full-range driver with level response. 41 101 108 116 0.3 0.4 Midrange-tweeter
Download Datasheet Datasheet

(832.21 kB)

Download PDF Tech specs

(158.33 kB)

Download 3D Model 3D models

(2.53 MB)

RAB-32257-000 Our smallest full-range driver with tuned vent for warm, distinct bass and crystal clear treble. 46 103 110 118 0.3 0.4 Yes
Download Datasheet Datasheet

(903.03 kB)

Download PDF Tech specs

(123.32 kB)

Download 3D Model 3D models

(1.73 MB)

SR-32453-000 4th-generation cylindrical balanced armature driver with new precision vent for improved bass response. 50 104 111 118 0.3 0.4 Yes
Download Datasheet Datasheet

(1.16 MB)

Download PDF Tech specs

(120.62 kB)

Download 3D Model 3D models

(137.02 kB)

TWFK-30017-000 Small dual driver with exceptional bandwidth & clarity, level response. 43 106 112 117 0.5 0.6 Yes Midrange-tweeter
Download Datasheet Datasheet

(941.66 kB)

Download PDF Tech specs

(156.26 kB)

Download 3D Model 3D models

(4.05 MB)



Pre-assembled multi-way full-range drivers

  • Speed premium earphone time-to-market by using Knowles preassembled Balanced Armature drivers.
  • The models below represent popular configurations. 
  • Want a different response? Knowles can customize their performance to meet your goals.
Model ID Description Imp @ 1kHz (ohms) Sensitivity to 100mV (dB SPL) @ 1kHz Sensitivity to 1mW (dB SPL) @ 1kHz Max SPL 10% THD (dB SPL) @ 1kHz THD @ 94dB SPL @ 1kHz THD @ 100dB SPL @ 1kHz Vented Additional Applications Downloads
GK-31732-000 Crystal-clear 3-way combination with level sound, wide bandwidth and extremely low THD. Customizable crossover, damping for profile tuning. 11 113 113 131 0.1 0.2 No
Download Datasheet Datasheet

(1.15 MB)

Download PDF Tech specs

(173.60 kB)

Download 3D Model 3D models

(9.25 MB)

GQ-30783-000 Small 2-way combination with warm bass and excellent high frequency extension. Extremely low THD. 38 111 116 125 0.1 0.5 Yes
Download Datasheet Datasheet

(1.23 MB)

Download PDF Tech specs

(136.40 kB)

Download 3D Model 3D models

(7.35 MB)

HE-31751-000 High output 2-way combination with level sound, wide bandwidth and extremely low THD. Customizable crossover, damping for profile tuning. 112 112 123 132 0.1 0.2 No
Download Datasheet Datasheet

(1.25 MB)

Download PDF Tech specs

(158.07 kB)

Download 3D Model 3D models

(5.12 MB)



Tweeters

  • Knowles tweeters are known for their exceptional clarity and high frequency extension in either hybrid or multi-way Balanced Armature earphones.
  • Their small size makes them ideal for ear tube mounting.
  • Demonstrated output to 40kHz to meet the JAS "Hi-Res Audio" initiative.
Model ID Description Imp @ 1kHz (ohms) Sensitivity to 100mV (dB SPL) @ 1kHz Sensitivity to 1mW (dB SPL) @ 1kHz Max SPL 10% THD (dB SPL) @ 1kHz THD @ 94dB SPL @ 1kHz THD @ 100dB SPL @ 1kHz Vented Additional Applications Downloads
SWFK-31736-000 High-output dual tweeter 6.9 102 100 114 0.2 0.2 No
Download Datasheet Datasheet

(919.34 kB)

Download PDF Tech specs

(166.80 kB)

Download 3D Model 3D models

(1.56 MB)

WBFK-30095-000 Ultra-small single tweeter 13.8 96 97 106 0.4 0.7 No
Download Datasheet Datasheet

(1.04 MB)

Download PDF Tech specs

(168.18 kB)

Download 3D Model 3D models

(2.33 MB)



Woofers

  • Featuring high output capability and exceptionally low THD, Knowles woofers provide unparalleled bass clarity at typical listening levels.
Model ID Description Imp @ 1kHz (ohms) Sensitivity to 100mV (dB SPL) @ 1kHz Sensitivity to 1mW (dB SPL) @ 1kHz Max SPL 10% THD (dB SPL) @ 1kHz THD @ 94dB SPL @ 1kHz THD @ 100dB SPL @ 1kHz Vented Additional Applications Downloads
CI-22955-000 High output single woofer 80 112 122 133 0.1 0.1 No
Download Datasheet Datasheet

(778.08 kB)

Download PDF Tech specs

(130.81 kB)

Download 3D Model 3D models

(632.06 kB)

HODVTEC-31618-000 Very high output dual woofer 48 123 130 141 0.1 0.1 Yes
Download Datasheet Datasheet

(974.14 kB)

Download PDF Tech specs

(130.85 kB)

Download 3D Model 3D models

(2.73 MB)



Select a product category to view features, benefits, documents and performance details

Image Series Features
Full-range drivers Full-range drivers
  • Knowles full-range Balanced Armature drivers set the standard for bandwidth and clarity in premium earphones and in-ear wearables.
  • The most popular models are represented below. Not seeing what you need? Discuss your requirements with a Knowles field Engineer.
Pre-assembled multi-way full-range drivers
Tweeters
Woofers