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Room Modes

If I calculate by using the ceiling's average height (110"), these are axial room modes I came up with:

33.7, 52.2, 61.6, 75.3, 104.3, 123.3, 150.7, 208.6, 246.6, 301.3, 417.2, 493.1

The percentage difference of each room mode from its neighbor is:

38%, 18%, 22%, 38%, 18%, 22%, 38%, 18%, 22%, 38%, 18%, 22%

In my calculated ideal room, the percentage difference of each room mode from its neighbor is:

62%, 24%, 31%, 24%, 24%, 31%, 24%, 24%, 31%, 24%, 24%, 31%

I think the greatest separation overall is best to avoid uneven bass buildup at certain frequencies, but of course as the distance between some increases, the distance between others decreases. Overall, I think the room in the home I am considering is pretty well balanced. There aren't any under 5% difference from a nearby frequency, not even close.

Opinions?

Anyone know a way to calculate and appropriately weight tangential and oblique modes as well?

Does anyone know how to more accurately calculate room modes for slanted ceilings?

On the other hand, you have five fingers.


Edits: 05/11/12
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