| Ethan is 100% right. Room size is critical! Especially with a small room. What you are looking to do is make sure the room does not have any dimensions that are equal to another (or a multiple of that number). A 2m(H) by 2m(W) by 2.5m(L) space will cause no end of modal problems.
What you are looking for is to use ratios (the one above is 1:1:1.25, bad) that fall into "Bolt's Area" (Bolt's Area is a graph that shows good rectangular room dimension ratios for uniform modal frequency dispersion)
Good ratios would be
H - W - L
1 - 1.14 - 1.39 (Sepmeyer)
1 - 1.28 - 1.54 (Louden)
1 - 1.5 - 2.5 (Volkmann)
If you use Sepmeyer's ratio, take your height and multiply it by 1.14, that is the width of the booth. Take the height again, and multiply it by 1.39, that is the length it should be based on Mr. Sepmeyer's work. There other ratios out there (I used Volkmann's). I would highly recommend you get "Master Handbook of Acoustics". There is so much valuable information in there, it is my "Bible" for acoustics.
Doc |