Hey Mojo, I see why. Smart postioning of the EP600 on that mid-sidewall alongside the length of the sofa. If you have a robust amp, I would suggest a 60hz crossover to get better deep response without compromising stereo imaging on the M80s. Your FR graph doesn't load by the way.
The other significant advantages of duals include less distortion,ringing and compression at high transients. Besides going dual, I would suggest you take a long look at acoustical treatments. Bass traps would really tighten up LF sound in that big irregulaur room.
