Z99, welcome. As others indicated, you, not the speakers, are in control of the volume level. One point would be that in a room that size it'd be likely that the trim control on the EP600 would likely be best set at "Full", to better balance the boost in very low frequency response that occurs in a small room. As far as positioning of the 600, the strongest and smoothest response would likely be in the corner behind the M80s which was farther from a large opening in the wall.

-----------------------------------

Enjoy the music, not the equipment.