ODS123
Super Member
I just installed mine and it took me about 5 minutes. The install is literally two screws, pull it out, slide the new one in - there is what looks like an RS232 plug on the back (for all the old schoolers on here). I am not sure about installing one on an MA6600, though, since it didn't already have a tuner. Worst case is you might need a re-flash. I would ask McIntosh directly - I sent a question to them about installing it in my 6700 (online form on their website), and they responded the next day.
-Geoff
Thanks Geoff!!