Amazon Link - http://www.amazon.com/Pinnacle-Sp...B0015AB7U6
Don't let the size fool you.
Experience powerful, deep bass down to 30Hz with the Pinnacle PS SUB 225 powered subwoofer. This compact front-firing subwoofer delivers all of the explosive sound your movies, music and TV have and since it has its own amplifier, your other equipment is free to handle the rest of the frequency range.
Features anti-clipping circuit for high level bass, line-level input, phase switch and volume
12" heavyweight polypropylene woofer with 1.5" dual-layer voice coil
Includes high-quality gold-plated interconnect cable for easy hookup
Has line-level input, a phase switch and solid-brass isolation cones