Imagine a subwoofer that actually uses the walls of your listening room to radiate bass frequencies. Then open your eyes to the S88. We've positioned two 8" woofers at 90o angles and paired them to a 250-watt amplifier and precision crossover network. Put the S88 in a corner, and be prepared to go deep.     System Configuration: Compact Powered Subwoofer Woofer: Dual 8" Long Excursion treated paper cone woofer with butyl surround Port: None, Sealed Box design Frequency Response: 28Hz-150Hz Power: 250 Watts RMS Hook Ups: RCA Line Level & Speaker Level Additional Features: Auto On/Off, Variable Low Pass Crossover, Bass Boost, Phase Control, Built-in High Pass Crossover User accessible Fuse Cabinet: Black Vinyl with Black double-knit grille Dimensions: 12 1/16 " x 12 1/2 " x 13 1/2 "(+ 1 ¼" for feet) Weight: 30 lbs. Warranty: Limited 2-year