Also check your settings after running Audyssey for speaker size/crossover. If speakers show large, you should change that setting to small. For ex, the M80's might be set to large with a lower crossover of 40hz. Change to small, and then maybe bump up the crossover to 60 or 80.

This is normal, and recommended by Audyssey company, and the users guide many follow on AVSforum.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85