Well, that's what I'm trying to understand. Say I have the typical "minimum component" circuit with a gain of 20. With a supply voltage of 12v the ideal output bias is generally 6v though certainly if I know the headphones will never use more than 2v peak-to-peak and the chip can't drive closer than 0.3v from the negative rail then a 1.3v output bias is acceptable.
Anyways, say I need a 6v output bias- does this chip just work off a straight DC gain, in which case I need to give the noninverting input a DC bias of 6v/20, or does it set the bias itself? I didn't see where the example circuits made any effort to set bias externally like that.