I have no problem with the "growing out of" the M80s, as each individual has his own taste. The thing that bothers me a bit is when you speak about speaker clarity in a big space with cement walls and that seems to be untreated, JMO. Anyway, good luck with your auction and I hope you'll find the sound you're looking for.

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."