sure 2024 power supply

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I use an old 300 watt ATX computer supply with a jumper between ground and a wire. I forget what it is called. Without that jumper it works just as you described. Also very important to have the ground wire to the amp be short and fat to cut down on noise due to voltage difference from input ground. I cut off the molex and used two of the ground wires to connect. Also the same for the 12 volt lines although that is not as important.
 
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