Pair the Bose B1 bass module with your L1 Model I or L1 Model II system, to fill out the low end. You'll find that the B1's compact-yet-powerful design enhances the sound of low-pitched instruments, such as bass guitars, drums, and male vocalists. What's more, the B1 bass module subwoofer will add dimension to guitar and keyboard sources. Included with the Bose B1 bass module are a 4-pin Speakon cable and a convenient slip cover. A top-mounted handle makes it easy to travel with the Bose B1 bass module.