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Nice build - an innovative solution - although I can't say I had the hissing problem you described. Instead, my sound quality was quite low, to the point where I thought I had a defective speaker which I ended up replacing.

The sound on mine sounds very low quality - like it's being clipped or reproduced at a lower sampling rate (like < 11khz).

This combined with your problem makes me wonder if that amplifier board is any good.