Pyle Active Down Firing Subwoofer - 10 Inches, Ported Design with High-to-Low Input Level Controller, Invisible Down-Firing Speaker, Color Black, Built-in Convenience - PSUB10A - Walmart.com
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FOCAL SUB1000F 12" 1000 Watt Powered Subwoofer Black | Accessories4less
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I built a subwoofer for my home theater! - YouTube
300W Subwoofer amplifier board low pass filter subwoofer pure home theater active subwoofer amplifier - AliExpress
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Focal Sub One Active Subwoofer Black - AV Luxury Group