I owned m60's for 4 years before my m80's, there is very little difference. The m80's are a little more efficient, so they will play a little louder at the same volume level. If you have all your speakers calibrated with an spl meter to the same dB level, you would be hard pressed to tell much difference. Something just seem wrong with what your saying.

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