Monoprice Monolith M-215 THX Dual 15 inch Subwoofer |Unboxing, BASS Test & Overview - YouTube
I want to buy this but not many reviews. Anyone have one? : r/hometheater
Monolith THX Tower Speakers & Dual 15" Sub On Sale - HomeTheaterReview
Amazon.com: Monolith THX Certified 8in 150-watt Powered Subwoofer, Deep and Powerful Bass, Compact Design, Quick and Easy to Setup, for Home Theater or Gaming Systems : Electronics