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Monoprice SWA-200 Subwoofer Amp - Black - 200 watt with Crossover, Phase Control, Cool Class D Amps - Walmart.com
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Amazon.com: Monoprice SWA-200 Subwoofer Amp - Black - 200 watt with Crossover, Phase Control, Cool Class D Amps : Electronics
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Amazon.com: BOSS Audio BX35 3-way Pre-Amp Electronic Crossover with Remote Subwoofer Control by BOSS Audio : Electronics
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