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TDA2030 15W+15W 30W 2.1 Channel Subwoofer Amplifier Board DIY Finished Module
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TDA2030 15W+15W+30W 2.1 Channel Amplifier Audio Board Subwoofer Amplifier Bass Output for Speaker DIY Dual AC12-15V - Walmart.com
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Bluetooth Amplifier Board Mono Subwoofer Amp For 5-10 inch Bass Speakers DIY 30W | eBay
