Bose 40146 Surface-mount Bass Module 70/100V Selectable | Color: BlackThis surface mount bass module adds low frequency reinforcement to commercial sound systems where additional bass is needed. It uses a 5. 25 inch low frequency driver and is designed to deliver non localized bass response down to 40 Hz. The configuration supports selectable 70 100V or low impedance operation and allows parallel connection of multiple modules. Each bass module can accommodate two or four FreeSpace 3 satellites, making it suitable for