Troy:

What kind of SPLs are you getting at your MPL when you are playing your music? How far back is your MPL from the M80s?

Perhaps you are just driving them to their limits at very high SPLs. Not to preach, but anything over 90 DBs will be eventually detrimental to one's hearing.

I find that 80 to 90 DBs (as measured with my RS SPL Meter) at my MLP (10' back) using M2s + a pair of EP400s is about all that I can handle these days unless I'm into the sauce, ha!

TAM