JBL 4622/4639 THX Certified Monitors - Techtalk Speaker Building, Audio, Video Discussion Forum
JBL 3.1 Professional Theater Speaker System 18" Subwoofer!! THX Certif – SkyFi Audio
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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