X15+ Subwoofer New product - M&K Sound® | Official Site
Monoprice 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 - Newegg.com
Monolith Thx Certified 8in 150w Powered Subwoofer, Deep And Powerful Bass, Compact Design, Quick And Easy To Setup, For Home Theater Or Gaming Systems : Target
Klipsch KW-120-THX Ultra2 Subwoofer — Home Entertainment by D-Tronics
THX-1200-SW Subwoofer | Klipsch
THX-1200-SW Subwoofer | Klipsch
Klipsch THX-1200-SW Black Subwoofer
Klipsch KW-120-THX THX® certified passive subwoofer with matching amplifier at Crutchfield