I do like my in/on wall M22's which have a bit better bass than the on-wall only equivalent, but they do totally need my EP500 backing them up.

With M5 on-wall's I could start using a 60Hz or better crossover setting and I'm sure the sound quality would improve.
Now to make my wife understand why it's in her best interest to let me upgrade the HT.... wink

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1