I have an NAD2200, which I was told on this forum isn't common ground. So, I built an AI-1. The NAD is solid, but I'd like to go back to the plain cable. You loose something with the transformer.
From what I can tell, wheather an amp is common ground or not is never published. Does anyone know if the other NAD amps 2600, 2700, 2400, c270, etc.. are common ground? I'm worried it might be a design feature of NAD in all their amps.
Are 99.9% of the amps out there common ground? Or is non-common ground fairly common. (no pun intended)