This is not the main issue, but its annoying and disturbing that McIntosh hasni't helped. I need to point out that I have contacted them about issues with my 352 and they have never responded. I was in the market for Mac seperates and had questions that they never respnded to. It may be why I decided NOT to get the $20,000 C53 and matching unit. Not good that we spend this much money on audio equipment and they have no customer service.