Bose Sub1 Bass Module for L1 Pro Portable PA Systems | Sweetwater
Bose B1 Bass Module
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 B1 Bass Module for L1 Portable PA Systems Reviews | Sweetwater
Bose L1 Model 1S, B1 Bass Module, and ToneMatch System - Sweetwater Sound - YouTube