Robb, I was just re-iterating what Axiom has stated as being the reason Yamaha is on the not for use list with M80s, because in the past during their testing, from year to year Yamaha would make P/S changes in certain models which would cause problems even though the previous version worked with out any problems.
And Robb if you haven't noticed you don't own M80s so you can continue using Yamaha
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As I said the O/P should try the 663 before panicing, most people are not having problems, but I do recall somone with the 1800 had some sort of problem or was that just the YPAO and the center channel?
