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Bose FreeSpace Series 3 Acoustimass Bass Module

Designed to provide surface-mount bass augmentation for new and existing background music systems. Features one 5.25" (133 mm) woofer that delivers deep bass down to 40 Hz without audible distortion. For indoor applications only.


  • Retail stores

  • Restaurants and bars

  • Lobbies and conference rooms



Low-frequency loudspeaker featuring one 5.25" (133mm) woofer that delivers deep, non-localized bass down to 40 Hz without audible distortion. For surface-mount applications


Acoustimass speaker technology filters out audible distortion to deliver non-localized bass

Designed to work with the FreeSpace 3 surface and flush satellite speakers, or existing systems where additional bass reinforcement is desired


Module design allows parallel connection of multiple bass modules and can accommodate two or four FreeSpace 3 satellites per bass module


Selectable 70/100V or low impedance




Frequency Response (+/-3 dB) 
50 Hz - 230 Hz


Frequency Range (-10 dB) 
40 Hz - 315 Hz


Nominal Dispersion 
Omni-directional below 200 Hz


Long-Term Power Handling 
70/100 V: 200 W (800 W peak) mono

Low impedance: 50 W (200 W peak) per channel stereo or 100 W (400 W peak) mono


Sensitivity (SPL / 1 W @ 1 m) 
Per channel: 76 dB SPL (Mono: 79 dB SPL)


Maximum SPL @ 1 m 
Per channel: 96 dB SPL (102 dB SPL peak)
Mono: 102 dB SPL (108 dB SPL peak)


Nominal Impedance 
5 Ω mono direct (transformer bypassed)