Amazon.com: Monolith THX-275IW THX Certified Ultra 3-Way in-Wall Speaker - 6.5 Inch Woofers, Silk Dome Midrange and Tweeter, 4 Ohm Nominal Impedance, 3.7 Inch Mounting Depth, Easy Install, for Home Theater : Electronics
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Amazon.com: Monolith M518HT THX Certified 5.1 Channel Home Theater System, 150‑Watt 8 Inch Powered Subwoofer, Built-in Keyhole for Mounting, for Home Audio Systems or Gaming Systems, Easy to Connect : Electronics
M&K Sound unveils new line of THX Certified® reference subwoofers
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Enclave THX Certified CineHome Pro 5.1 CineHub Edition Wireless Audio Home Theater Surround Sound System 24 Bit Dolby Digital & DTS, WiSA Certified - Newegg.com
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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
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Amazon.com: Monolith THX-365C Ultra Center Channel Speaker (Each) THX Certified, Premium Drivers, Premium Built Cabinet,Black : Electronics
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
Monoprice Monolith THX-465IW THX Certified Ultra 3-Way In-Wall Speaker, 37Hz ~ 20kHz Frequency Response, Easy Install, For Home Theater - Walmart.com