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Monoprice 141287 Monolith THX Certified 5.1 Home Theater System, with 150‑Watt Powered Subwoofer
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Klipsch ProMedia Active Speaker System - 2.1 Channel, 2 Speakers, Subwoofer, 100 Watt, 35 - 22000Hz Frequency, Integrated Amplifier, 2x 3.5 mm, THX Certified - 1067415 at TigerDirect.com
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M&K Sound unveils new X+ Series line of THX Certified® reference subwoofers - M&K Sound® | Official Site