Amazon.com: 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 : Electronics
THX products finder –THX Certified, THX AAA, THX Spatial Audio
Monolith by Monoprice THX-365C THX Certified Ultra Center Channel Speaker (Each) - Monoprice.com
Amazon.com: Monolith THX-365C Ultra Center Channel Speaker (Each) THX Certified, Premium Drivers, Premium Built Cabinet : Electronics
Amazon.com: Monolith THX Certified Satellite Speakers (Pair) Compact Form Factor, Wall Mounting Keyhole, MDF Enclosures, Easy to Connect, for Home Theater or Gaming Systems : Electronics
Logitech Z625 2.1 Speaker System 200w/RMS Black THX w/Subwoofer & Optical Input - Walmart.com
KEF Ci4100QL-THX Speaker White CI4100QL-THX IN-WALL THX SELEC - Best Buy