FreeSpace 3 Series II Acoustimass Bass Module (Black)

Our Part Number: 3-S-FMBM-B
Manufacturers Part Number: 40148
  • Single unit
  • Flush mount 5.5" woofer
  • For indoor applications only

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Designed to provide flush-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.


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

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

Designed to work with the FreeSpace 3 flush and surface 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

Plenum rated for use in air handling spaces (with optional plenum cover)

Selectable 70/100V or low impedance with transformer tap adjustment under speaker grille


  • Retail stores
  • Restaurants and bars
  • Lobbies and conference rooms
Data sheet
Frequency Response50 Hz - 230 kHz
Sensitivity (spl)Per channel: 76 dB SPL (Mono: 79 dB SPL)
Maximum SPLPer channel: 96 dB SPL (102 dB SPL peak) Mono: 102 dB SPL (108 dB SPL peak)
Power Handling70/100 V: 200 W (800 W peak) mono Low impedance: 50 W (200 W peak) per channel stereo or 100 W (400 W peak) mono
DispersonOmni-directional below 200 Hz
ConnectorsMulti-position screw-type barriers
Input Impedance6 Ω mono direct (transformer bypassed)
Product Weight14 lb (6.4 kg)
Shipping Weight20 lb (9.1 kg)
ProtectionOverload Protection: PTC

3 Series II Tech Data Sheet

Technical Data Sheet for the Bose 3 Series II Acoustimass Bass Module

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