Amazon.com: Monolith THX Ultra Certified 2000 Watt Powered Subwoofer - 13-Inch, Massive Output, Low Distortion, for Studio and Home Theater Systems, Black Ash Finish : Electronics
Monoprice Monolith 13in THX Ultra Certified 2000 Watt Powered Subwoofer Massive Output, Low Distortion, For Studio and Home Theater Systems - Newegg.com
Monoprice Shakes Things Up With Two New Massive THX Subwoofers [Updated] - ecoustics.com
Monoprice Unveils New Monolith THX Ultra-Certified Powered Subwoofers | audioXpress