[C@ VOLUME SENSING BASS RESTORATION DEVICE. re-GE, the S-channel volume sensing bass restoration device, Is designed 16 restore bass wain adding aftermarket amplifiers to a factory audio system, Most OEM systems "roll off the bass to avoid clam aging the speakers at higher volume levels. While: this is acceptable when using stock speakers, its rot desired when acing amplifiers 3s it meets the low frequency cup of your system.