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I have the same APC 15, but it’s in my living room system which is a 5.1 for television and movies. Have never tried in a 2-channel system. With this said, and from my recollection, this particular unit was made for media/HT systems. Long ago I tried many power conditioners and this was the only one that simply protected and didn’t kill dynamics.
Couldn’t hurt taking it outside of the equation to see what happens, though.