Apart SubA165, Active Subwoofer for Installation, 8"" Basswoofer, 4 Ohm, 100 W AES/170 W Peak, Adjustable TP 40 - 160 Hz, Phase switch, Volume control, 89 db @ 1W / 1m, Frequency range: 30 - 180 Hz, RCA and Hi-level inputs, Colour: Black, Ideal in conjunction with MASK and SDQ loudspeaker series