Acoustics matter most at low volumes, say I. The need and type of bass traps varies a great deal based on the dimensions of the room. The GIK soffit traps do an amazing job in the lowest octaves where most acoustic treatments won't do anything at all.
You might also want to look at the AM Acoustics room simulator, which will help you visualize your room modes and help you place your speakers and listening location outside the worst modes.