This is from Acoustic Audio's line of Home Theater Series subwoofers. This powered sub features a 15" down-firing long throw subwoofer with a Poly-Zirconium cone, for 30% more controlled bass, and a built-in 600 watt Digital Drive high efficiency amplifier to deliver powerful, precise low frequencies for the ultimate movie and music experience. The advanced RFL bass reflex cabinet features a downward radiating slot port allowing it to produce dead accurate bass from 21Hz-200Hz. It has an adjustable gain control and a variable crossover so you can perfectly match the bass response with your speakers. It is equipped with both high/low level inputs and line outputs for adding additional subwoofers. The black ash cabinet fits with any decor.