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Knowles micro-size speakers

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’ speakers (also called miniature speakers or micro-speakers) combine outstanding performance vs size ratio.

Knowles’ speakers are available in different shapes:

  • rectangular (9 x 16 mm, 11 x 15 mm and 13 x 18 mm)
  • round (Ø16.4 mm to Ø28 mm)

with spring contacts.

To view only wideband micro-size speakers and more generally Seltech’s wideband acoustic products, please click here to download a pdf.

Below, Knowles’ speaker portfolio:

Note 1: Contact system of all speakers is springs.
Note 2: Impedance of all speakers is typically 8 Ohms
*) 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
****) @max sine power. Average value measured in baffle in 0.1 meter distance at max sine power, in typical backvolume

 Speaker Model Picture Dimension (mm) Sensitivity* (W/m) Air pumping capacity Typical backvol. (total) f0 in typ. backvol. (Hz) Frequency range** (Hz) Nominal power*** (mW) SPL max****
2403-260-00165 WILDCAT S9 IPx8 waterproof 2403-260-00165 WILDCAT S9 IPx8 waterproof 9 x 16 x 3 75 NA 1 cm³ 950 900 - 12000 700 93 dB
2406-263-00301 DONAU SLIM IPx8 waterproof 2406-263-00301 DONAU SLIM IPx8 waterproof 11 x 15 x 3 73 NA 1 cm³ 800 650 - 12000 600 90.5 dB
2403-260-00091 COBRA IPx7 waterproof 2403-260-00091 COBRA IPx7 waterproof 11 x 15 x 3.5 74 81mm³ 1cm³ (1.57cm³) 850 700 - 20000 1000 94dB 1000 / 700 mW
2403-260-00001 DONAU 2403-260-00001 DONAU 11 x 15 x 3.5 73 69mm³ 1cm³ (1.57cm³) 800 650 - 16000 500 89dB (350mW)
2403-260-00071 GRAND 2403-260-00071 GRAND 13 x 18 x 2.5 73 82mm³ 1cm³ (1.59cm³) 750 600 - 16000 600 90.5 dB (600 mW)
HPFS 28x6 HPFS 28x6 Ø 28 x 6 86.5 390 mm³ open 700 450 - 8000 500 102.5 dB (500mW)
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