Marcus_C, I'm certainly no authority on this matter. And my onboard coax out could be the reason of the difference. But the gamma2 with asrc sounded much better than my opus+ballsie combo. In fact listening to the gamma2 (+mini3+hd595) was the first time I was really happy with my setup. There might be other reasons for this, but the main difference was the asrc.
I'd be happy if someone else has any insights on this.