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SMP300 500W Mono Subwoofer Amplifier | Whole House Audio
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Class D Subwoofer Amplifier Module TPA3116 1x50W 8 Ohm - Audiophonics
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Amazon.com: D'Amore Mono Subwoofer Amplifier, 1000 Watt Amp, 1 Ohm Stable, Clean D Technology & MOSFET Power Supply, Subwoofer Control Included (E1000.1) : Electronics