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Amazon.com: Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp 50 Watt x2+100 Watt for Home Outdoor Passive Speakers/Subwoofer Powered Subwoofer : Electronics
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TDA7377 Amplifier Board 2.1 Channels Audio Power Amplifiers Bass Treble Volume controller DIY 3 Channel Amplifier System
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Bluetooth 5 0 Power Amplifier Module 2 1 Channel Stereo Sound Digital Audio Amplifier Board - AliExpress
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