The Mac has both balanced and unbalanced inputs. I assume you are running balanced interconnects. Have you tried switching to unbalanced RCAs between the Mac and the 9500? The reason I ask is that I wonder if you are observing a fault in the Mac, and the unbalanced and balanced inputs have somewhat different circuit paths that may avoid the fault. I'm just poking around trying to find a cause -- this is a toughy.
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