Knowles Balanced Armature Resource Center

Knowles is the world leader in balanced armature solutions. We want you to understand the technology, it’s applications, and how it can work for you. Check back often for the latest information and insights into the future of pure, premium sound.

What is balanced armature?


Balanced Armature Advantage


The Future of Portable Audio


Learn how balanced armature drivers provide premium sound in a smaller, lighter package.
An overview of the benefits of balanced armature technology for today’s demanding devices.
See how balanced armature is poised as the driver of choice for the premium sound revolution in earphones and in-ear wearables.

Full-range drivers

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-26824-000High output driver especially suited for use with external EQ tuning.221141181270.20.2YesMidrange-woofer
Download DatasheetDatasheet (952.92 kB)
 Download PDFTech specs

(197.71 kB)

Download PDF3D models 

(1.39 MB)

DWFK-31785-000Bass-oriented version of TWFK.301061111200.40.5Yes
Download DatasheetDatasheet

(985.12 kB)

Download PDFTech specs

(152.90 kB)

Download PDF3D models 

(4.84 MB)

ED-26805-000Level sound with high output for its size.281091131230.30.3YesMidrange-tweeter
Download DatasheetDatasheet

(959.63 kB)

Download PDFTech specs

(149.06 kB)

Download PDF3D models

(1.17 MB)

ED-31305-163High impedance driver with warm bass.841021111192.83.9YesMidrange-woofer
Download DatasheetDatasheet

(839.39 kB)

Download PDFTech specs

(122.41 kB)

Download PDF3D models

(1.55 MB)

RAB-32033-000Our smallest full-range driver with open vent, ideal for use with external EQ tuning.481041101181.42.0Yes
Download DatasheetDatasheet

(791.14 kB)

Download PDFTech specs

(122.05 kB)

Download PDF3D models

(1.55MB)

RAB-32063-000Our smallest full-range driver with level response.411011081160.30.4Midrange-tweeter
Download DatasheetDatasheet

(314.24 kB)

Download PDFTech specs

(158.33 kB)

Download PDF3D models

(158.33 kB)

RAB-32257-000Our smallest full-range driver with tuned vent for warm, distinct bass and crystal clear treble.501051121180.30.5Yes
Download DatasheetDatasheet

(305.72 kB)

Download PDFTech specs

(123.32 kB)

Download PDF3D models

(2.53 MB)

RAF-32873-000Our smallest full-range driver with tuned vent for warm, distinct bass and crystal clear treble. Bottom terminals.501051121170.40.6Yes
Download DatasheetDatasheet

(397.96 kB)

Download PDFTech specs

(860.85 kB)

Download PDF3D models

(1.73 MB)

RAF-32902-000Our smallest full-range driver with level response. Bottom terminals.411021081180.40.6Midrange-tweeter
Download DatasheetDatasheet

(372.30 kB)

Download PDFTech specs

(856.69 kB)

Download PDF3D models

(2.25 MB)

SR-32453-0004th-generation cylindrical balanced armature driver with new precision vent for improved bass response.501041111180.30.4Yes
Download DatasheetDatasheet

(1.16 MB)

Download PDFTech specs

(120.62 kB)

Download PDF3D models

(2.20 MB

TWFK-30017-000Small dual driver with exceptional bandwidth & clarity, level response.431061121170.50.6YesMidrange-tweeter
Download DatasheetDatasheet

(293.05 kB)

Download DatasheetTech specs

(156.26 kB)

Download Datasheet3D models

(4.05 MB)

 

Pre-assembled multi-way full-range drivers

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-31732-000Crystal-clear 3-way combination with level sound, wide bandwidth and extremely low THD. Customizable crossover, damping for profile tuning.111131131310.10.2No
Download DatasheetDatasheet

(1.15 MB)

Download PDFTech specs

(173.60 kB)

Download PDF3D models

(9.25 MB)

GQ-30783-000Small 2-way combination with warm bass and excellent high frequency extension. Extremely low THD.381111161250.10.5Yes
Download DatasheetDatasheet

(1.23 MB)

Download PDFTech specs

(136.40 kB)

Download PDF3D models

(7.35 MB)

GU-32829-0002-way combination with excellent bass response and dynamic range171131161310.10.2Yes
Download DatasheetDatasheet

(222.65 kB)

Download PDFTech specs

(144.01 kB)

Download PDF3D models

(144.01 kB)

GV-32830-000High dyamic range/ low THD 4-way combination with rich bass and premium bandwidth281131161250.20.3Yes
Download DatasheetDatasheet

(247.35 kB)

Download PDFTech specs

(145.31 kB)

Download 3D Model3D models

(4.48 MB)

HE-31751-000High output 2-way combination with level sound, wide bandwidth and extremely low THD. Customizable crossover, damping for profile tuning.1121121231320.10.2No
Download DatasheetDatasheet

(1.25 MB)

Download PDFTech specs

(158.07 kB)

Download 3D Model3D models

(5.12 MB)

 

Tweeters

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-31736-000High-output dual tweeter6.91021001140.20.2No
Download DatasheetDatasheet

(919.34 kB)

Download PDFTech specs

(166.80 kB)

Download 3D Model3D models

(1.56 MB)

WBFK-30095-000Ultra-small single tweeter13.896971060.40.7No
Download DatasheetDatasheet

(1.04 MB)

Download PDFTech specs

(168.18 kB)

Download 3D Model3D models

(2.33 MB)

 

Woofers

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-22955-000High output single woofer801121221330.10.1No
Download DatasheetDatasheet

(778.08 kB)

Download PDFTech specs

(130.81 kB)

Download 3D Model3D models

(632.06 kB)

HODVTEC-31618-000Very high output dual woofer481231301410.10.1Yes
Download DatasheetDatasheet

(974.14 kB)

Download PDFTech specs

(130.85 kB)

Download 3D Model3D models

(2.73 MB)