Peter Lyndorf said the floor is the biggest problem causing area with regards to reflections(based on real testing) -Acoustics Forum-Acoustic Fields Forum

Peter Lyngdorf: I’ve done a lot of testing on the effects of reflections in rooms, and there was a big, big project in Denmark about twelve years ago, with a lot of companies involved in investigating effects of reflections in rooms. I had the pleasure of being a test person, where we could actually simulate the audible effect of the floor reflection, sidewall reflection, ceiling reflection, and so on independently. The single most disturbing reflection in the room is the floor reflection. That is what makes the speaker sound like a radio and not like the actual event. The second worse reflection is the ceiling reflection. Sidewall reflections, if they are sufficiently delayed (more than about five milliseconds) and are left/right symmetrical, can be actually beneficial to the sound. But if your speakers are very close to the sidewalls, you have to kill the side reflections. But do not be too concerned about the sidewall reflections. The floor reflection absolutely must be handled, followed by the ceiling reflection, either by absorption or diffusion.

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