Aiyima A07...
I bought one of these last year based on the review at Audio Science Review....Used it for a week and it was just plain horrible sounding. Maybe the one I received was bad.....It went back....
I'm surprised you like the mini amp over your NAD amp.
So am I!....Not a matter of liking it better, it easily sounds better with thos Sony speakers. Not even close!
This is my second adventure with Class D. I built an ICE Module Class D amp last year also.....Great little amplifier for around $300 USD.... http://rvbprecision.com/stereo/ice-power-amplifier-build.html