[Sonnie]

Yeah... if you like bass then a system tuned to a flat frequency response will sound... well... flat. Almost dull to me. Most of us around here prefer a house curve which gives us more bass.

Another thing is from where in the room did they optimize for a flat response? Were you sitting in that optimized location? How do they even know that they got it flat? Did they measure the frequency response with a program like REW?

Even if you crank up the gain... if there is no room gain, if there are standing waves, if the system is not optimized correctly, and/or if you are not sitting/listening from the optimized location... all these can effect what you hear.