Bose L1 Model 1S, B1 Bass Module, and ToneMatch System - Sweetwater Sound - YouTube
Bose® B1 Bass module for L1 speaker system at Crutchfield
Standard B1 slip cover
Bose B1 Bass Module
Bose B1 Bass Module - EZEE.com : High-end made ezee!
Bose B1 Bass Module 351964-0010 B&H Photo Video
Bose® L1 Model II System with B1 Bass Module Package Portable PA system with two-part 24-speaker array, bass module, power stand with amps, cover, and carrying bags at Crutchfield
Bose L1B1 Bass Module For the L1 Line Array System