Sounds more like a speaker problem.
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I don't believe it is an amp problem. For the midrange to go, there must be changes in circuit bias which is dependant on only a few components. In other words, it is all or nothing as far as the amp is concerned.
Do you have any other speakers to try? It could be a driver problem IMO (although agreeing with Rwwear). Try good speaker cables too (MIT is what I have and love it) since you may be getting inductive voltage drops at certain midrange frequencies (specified by high generic cable capacitance). I think the amp is the last thing to suspect.
Budrew, I almost replied to your other thread on the 'fancy outlet'. I looked at the BC site and saw that they're selling ACME outlets. I've run in 8 of these in my system, and there are periods during break in where the ACMEs sound very dull and lifeless as you described. You may hear this again at some point. They took a little over a month to stabilize in my system. Hang in there. I've seen some threads where people have given up after trying the FIMs for just a few days. Both sound excellent once thoroughly run in, although both have very different characters sonically.
I have the non-cryo 20 amp version. The ACME IMS has a very quick and transparent sounding mid-bass, and presents a wealth of upfront detail. Not etched sounding, but you get the sense you're hearing everything in a very transparent space. I was quite happy with the ACMEs until I heard the FIMs in my system. The comparison made the ACME sound like its tonal balance was tilted up in the upper mids, and by comparison a very fine dry grainy quality became noticeable from the mids up. The FIM is slightly darker, but more natural and smoother sounding. Initial impression with the FIM is that there isn’t as much detail, although its all there, some details just have a more distant perspective. Just my take.