Logitech Z625 2.1 Speaker System 200w/RMS Black THX w/Subwoofer & Optical Input - Walmart.com
Logitech Z623 2.1 Speaker System with THX Certified Audio
Monolith by Monoprice M518HT THX Certified 5.1 Home Theater System - Monoprice.com
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 Certified | Arendal Sound
Monolith by Monoprice THX-365C THX Certified Ultra Center Channel Speaker (Each) - Monoprice.com
Amazon.com: Logitech Z625 Powerful THX® Certified 2.1 Speaker System with Optical Input, black : 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