I think this is a quite rare issue. I've only seen it brought up twice. I've had the iha-6 for about 6 months now, and I've had absolutely no issues so far. Edit: I'm running with an Audiolab M-DAC and the Cayin iha-6, fully balanced all the way through. And usually with either HD650 or HE-400i's

I have the iHA-6 standing on my desk paired with a CA DacMagic Plus running fully balanced. I'm not disappointed. And the build quality of the iHA-6 is not bad at all. It's heavy and sturdy little amp.

Does anyone know how the IHA-6 is powered? (Class A, Class D etc.) I've already got it standing on my desk, but that's pretty much the only spec I don't know about it :) By the way, I'm quite impressed with the IHA-6. Probably one of the best balanced headphone amps for its pricerange.