KEF Q Series 150W, 200mm Ultra Thin Bezel In Ceiling / Wall THX Certified Ultra2 Subwoofer - CI200Qsb-THX
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KEF R Series 3x160mm Ultra Thin Bezel THX Certified Ultra II In Wall Subwoofer - Ci3160RLB
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Monolith Powered Subwoofer - 15 Inch with 1,000 Watt Amplifier, THX Certified, I - The ICT University