I used it to amplify the output of my USB sound card for my aviation headphones. The description says that the "minus" of the left and right channel output port cannot be connected together, otherwise the chip will be damaged. Yes, the speaker outputs are differential. But I needed an unbalanced output (common ground) for my headphones. The solution was to not use the (-) output side of the amp (I left it floating) but simply connect the (+) output side of the amp to the speaker (+) and the other side of the speaker to DC ground. Worked fine for me.
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