Amazon.com: Monolith 16in THX Certified Ultra 2000 Watt Powered Subwoofer (Matte Black/Painted) Low Distortion, for Studio and Home Theater Systems : Electronics
THX products finder –THX Certified, THX AAA, THX Spatial Audio
X15+ Subwoofer New product - M&K Sound® | Official Site
Amazon.com: Monolith Powered Subwoofer - 15 Inch with 1,000 Watt Amplifier, THX Certified, Ideal for Professional Studio and Home Theater : Electronics
Monoprice Monolith M518HT THX Certified 5.1 Channel Home Theater System, 150‑Watt Powered Subwoofer, For Home Audio System or Gaming Systems, USB, HDTV Ultra HD, Home DVD, FM Radio - Walmart.com
Logitech Z623 THX 2.1 Speaker System with Subwoofer, THX Certified Audio, 400 Watts
THX products finder –THX Certified, THX AAA, THX Spatial Audio
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
Logitech Z623 THX 2.1 Speaker System with Subwoofer, THX Certified Audio, 400 Watts
NeweggBusiness - Logitech Z625 Powerful THX® Certified 2.1 Speaker System with Optical Input
New Line of THX Certified Dominus Reference Subwoofers by M&K Sound | audioXpress