I use room treatments and eq extensively in my listening room. I have thick pad under the carpet, acoustical panels on the side walls, and a acoustical cloud(diffusion panels) on the ceiling. Whatever cannot be correct acoustically, I have three 1/3.octave eq's for each of the six channels that deal with the remaining problems electronically. At the listening position(center seat on a leather sofa) the overall frequency response deviates no more than 1.5db. To the left and right, no more than 2.5db. My room looks like a recording studio, but I don't really care. I have no wife to worry about those things.