Monoprice Monolith THX Subwoofers Shake the Foundation - ecoustics.com
Monolith 15in THX Ultra Certified 1000-Watt Subwoofer Dealer Ad - Canuck Audio Mart
Amazon.com: Monolith 16in THX Certified Ultra 2000 Watt Powered Subwoofer (Matte Black/Painted) Low Distortion, for Studio and Home Theater Systems : Electronics
Monoprice Monolith 10, 12 and 15-inch Subwoofer Review | Audio Science Review (ASR) Forum