Ok this is getting weirder by the minute. I swapped the Left and Right RCA cables at the input and powered up the amplifier again and the whine was gone. I swapped the inputs again and the whine is still gone. I will need to do further testing. Also, I hear "clean" audio from both channels and also bridged. Maybe I need to plug in a higher load since the speaker I am using is 8 ohms and I am using a small power supply. Either that or maybe leaving it on for a while.
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