PJPro:Integrated Amp = Pre Amp + Power Amp. Nothing to do with DACs.
Guh! Yeah, hands up, I'm an idiot, I've only ever dealt with integrated AV amps, which pretty much always have digital inputs (for DVD etc), and I made an assumption that whatever amp Nervous Pete got would include a pre-amp stage, just for flexibilty of connections (ie I'd have been surprised if he went straight from the PC to a power amp).
Anyway the point is the same, if he's using an external DAC the pre/power amp doesn't care if the signal was originally digital or not.