What is your budget? That is a fairly large room, and possibly the EP125 won't be able to move enough air to satisfy that space. You may want to consider one of Axiom's newer 350's or 400, that will give you better performance, even at lower volumes.

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