THX - How the Outlaw Ultra X-13 subwoofer brings big sound to bigger spaces
KEF Ci3160RLb-THX EACH In-Wall Subwoofer | Accessories4less
Klipsch KW-120-THX THX® certified passive subwoofer with matching amplifier at Crutchfield
Ci200QSb-THX | KEF USA
M&K Sound unveils new line of THX Certified® reference subwoofers
THX-1200-SW Subwoofer | Klipsch
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
Amazon.com: Monolith THX Certified Ultra 2000 Watt Powered Subwoofer - 16-Inch, Low Distortion, RCA and XLR Inputs, for Studio and Home Theater Systems, Matte Black : Electronics
Ci250RRb-THX | KEF USA
KEF Ci200QSb-THX Subwoofer PAIR – House Of Stereo
Sonance The Sub 12" THX subwoofer THE SUB (A) | eBay
Monoprice Monolith THX Subwoofers Shake the Foundation - ecoustics.com