Analog bass managed subwoofer The KH 810 has a bypassable 7.1 High Definition Bass Manager with remote volume control, four routing modes, fourth order crossovers and adaptable acoustical controls. From Mono to 3D, there are uses for the KH 810 in many different system configurations. Features: - 7.1 High Definition Bass Management (remote) - Very deep bass response (18 Hz) - High maximum SPL (110.7 dB)