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Knowles dynamic receivers

The receiver (also called hearing capsule) is the component in a telephone that is used near to the ear.

Seltech is the Worldwide Distributor and Key Account Agent of Knowles Sound Solutions for nearly 20 years in miniature speakers, receivers & multifunctionals.

knowles logoKnowles Sound Solutions facts & figures:

  • Global market and technology leader in dynamic speakers and receivers for cell phones for more than a decade
  • Customized acoustic solutions for the telecom, automotive and multimedia market
  • Over 5 billion products shipped to date
  • First to market with major innovations
  • Dedicated application support
  • Advanced automated manufacturing with highest production capacity worldwide
  • Best-in-class in-line measurement systems
  • Acoustic competence since 1929


Knowles’ dynamic receivers also combine outstanding performance vs size ratio.

Knowles’ dynamic receivers are rectangular (4.8 x 10 up to 8 x 15mm).
They can be used:

  • in low & high leak applications (low & high acoustic impedance)
  • and for standard and wide band frequency range


Most of Knowles’ dynamic receivers are Hearing Aid Compatible (HAC).

To view only wideband dynamic receivers and more generally Seltech's wideband acoustic products, please click here to download a pdf.

Below, Knowles receiver range:

Note 1: Contact system of all receivers is springs.
Note 2: Impedance of all receivers is typically 32 Ohms
*) average value measured in baffle, substract 10dB for value in dB/mW/0.1m
**) in typical application, at -3dB points after resonance peaks, without EQ correction
***) measured at 1kHz in 3.2 high leak adapter

 Receiver Model Picture Dimension (mm) Sensitivity* (W/m) Air pumping capacity f0 (hz) Frequency range**(Hz) Max sine power (mW) SPL max*** (@max sine power)
2403-260-00051 LEAN IPx8 waterproof 2403-260-00051 LEAN IPx8 waterproof 6 x 12 x 2 65 20 mm³ 350 300 - 7000 10 110 dB
 2403-262-00097 LEAN20 with mesh, HAC 2403-262-00097 LEAN20 with mesh, HAC 6 x 12 x 2 65 20 mm³ 350 300 - 7000 20 113 dB
 2403-260-00087 FRANKLIN HAC IPx8 waterproof 2403-260-00087 FRANKLIN HAC IPx8 waterproof 6 x 15 x 2 71 25 mm³ 400 300 - 7000 20 119.5 dB
 2403-263-00052 JULIA HAC 2403-263-00052 JULIA HAC 6 x 15 x 2.5 70 16 mm³ 450 400 - 4000 20 111.5 dB
 2403-260-00031 PETRA HAC 2403-260-00031 PETRA HAC 8 x 12 x 2 68 20 mm³ 350 300 - 7000 5 111 dB
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