Bose L1B1 Bass Module For the L1 Line Array SystemDelivers The Audio Fidelity Expected From Bose!! Connects to L1 Model I & Model II Adds Depth and Low End The Bose B1 Bass Module is a passive low frequency, portable speaker intended for use with the Bose L1 Model I & Model II Systems. The speaker enhances the low frequency response, adding depth and bass to musical instruments, DJ rigs and other sound reinforcement applications. The B1 may be connected to the power stand of the L1 Model I and L1