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from power supply to the switch and from the switch to Bluetooth 100 watt Amplifier Board
I made it too but mine i powerd by 12v and 1.5A powersupply and made of OSB plate its trendy look now in Norway the rat OSB look. And i have PIONEER TS-G1022I car speakers and I used the Bluetooth 100 watt Amplifier Board. It sounds amazing !TS-G1022I speakers