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Watts Up? A simple formula for recalculating the SPL at different power and distance

12 June 2025

Have you ever stared at a loudspeaker datasheet, scratching your head while trying to figure out what the actual Sound Pressure Level (SPL)…

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Home / News / NEW KNOWLES DUAL WOOFER: RDI-33438-000

NEW KNOWLES DUAL WOOFER: RDI-33438-000

Premium audio – Dual Woofer

  • Delivers warm, rich bass as part of a multi-driver system
  • Very high drive capability for low distortion at typical levels
  • Dual element construction for high efficiency and low mechanical vibration
  • Customization possible (impedance, damping, porting, etc.)
  • RoHS compiant

Typical Applications
Such as In-ear monitors or In-ear monitoring systems, True Wireless Stereo, Earphones, Hearables…

Key Parameters & Specs:

  • Impedance: 25 Ohms
  • Sensitivity to 100mV: 118 dB SPL
  • Sensitivity to 1mV: 122 dB SP
  • Max SPL*: 136 dB SPL
  • THD at 94dB SPL: 0.5%
  • THD at 100dB SPL: 0.3%

* SPL at 10% THD

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