The BOSE's L1 1S B1 portable PA system is designed to be clean, compact, and connection-free. This portable PA system may be used as a PA and monitoring system for solo artists and public speakers with up to 300 people in the audience. The upper array of the L1 Model 1S, the B1 Bass Modules, and the power stand are all designed to connect fast and conveniently without the use of speaker supports. For storage and transportation, all of the components fit into the provided carry bags. The B1 bass modules incorporate high-output, high-excursion speakers that are designed to deliver deep, powerful bass from a tiny enclosure.