Monster Home Theater StreamLine THX 100 Subwoofer (10") (Discontinued by Manufacturer) THX certified for movie theater quality sound in the comfort of your own home. Long throw 10" woofer with large double magnet for deep bass extension. Absolutely flat response 35-200Hz with accuracy +/-1dB for optimum acoustic room coupling. Special amplifier design of real 120-Watt RMS with THX equalization for optimum matching with Streamline satellite speakers Dimensions DxHxW (in):18.5 x 12.2 x 18.5