The clicking you hear is probably coming from the fancy stepped attenuator volume control your M3 is equipped with. I just sold an M3 that I had for a year and mine did the same thing and is considered normal. The BAT integrated I have now does the same thing because it has the same type of volume control-the clicking is actually louder on the BAT than it was on the M3. The benefit of a stepped attenuator is potentially better sound because only one resistor of the volume control is in the circuit at a time-or something like that, I'm not a techie. The click occurs when your volume control switches from one resistor to the next. Read up on your M3's volume control in reviews and NAD literature and then maybe you'll appreciate the clicking. Great amp, by the way. Enjoy it.
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