Originally Posted by

**1audiohack**
I only did a quick read on Audyssey and can not argue it's strengths or limitations. I doubt it's execution is bullet proof however.

That said, if we are considering a reasonably standard acoustical space that does not have dimensions with severe aspect ratios or major openings into other rooms, the region where a room is mode dominated can be calculated easily as follows;

Multiply the speed of sound by three, divide the answer by the rooms smallest dimension, eg 344 X 3 = 1032 / 2.44m = 422.9Hz

Divide the speed of sound by two, divide the answer by the rooms largest dimension, eg 344 / 2 = 172 / 5.8m = 29.6Hz

In the above example the region between 30Hz through 423Hz is where modes dominate and cannot be controlled by EQ. Lowering certain offending bands of energy put into the room can only help by not aggravating the beast, but you then have limited the dynamics of the system.

RTA cannot give you good information in this region and EQ really can't help. Do the math and see if this is the region that you don't like what Audyssey is doing.