The "pop" is normal on some ARC SS amps - don't know about the arc. Call ARC and ask them. They will give you a straight answer. I'm betting it's normal.
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A response only "tangentially" related to your question: the 150.2 sounds better if you just leave it on all the time, rather than turning it on and off; since it draws 40 watts at idle, there isn't much penalty to leaving it on 24/7. This was recommended in reviews of the 150.2 & its "big brother" the 300.2, as well as the dealer who was the previous owner of my 150.2; I follow that advice (which is why I don't have the direct experience to answer your question).