Quote:
Originally Posted by Wes Lachot  Nathan,
The 1 : 1.33 ratio is problematic. That's a 3 : 4 ratio, which makes it a perfect 4th, and perfect intervals are exactly what you don't want for room ratios (they're less than perfect, to say the least). You know how when you tune a guitar using 5th and 7th fret harmonics, you get the same tone from the two strings? (3rd harmonic of one string = 4th harmonic of the other.) It's the exact same thing here - your walls will be harmonizing in sympathy, making for a lot of reinforcement in one or two keys - in this case the keys of F and Bb - at the expense of all the other keys.
You're better off either shrinking down to a 1 : 1.26 ratio (Major 3rd) or going up to a 1 : 1.4 (Aug. 4th) Either will work okay with your length dimension. This way you'll be reinforcing the keys of either E or F#, both of which are a long way from Bb (the key of the height dimension). This is the sort of musical balance that will make your room sound even and true.
There's a bit of rounding in these numbers for the sake of simplicity.
--Wes |
Wes,
Thank you so much for taking time to respond to my post. I kind of see what you are saying, but could you break it down it detail for me? As far as the ratios being equal to pitch intervals, and why certain intervals are more desireable? You don't want the dimensions to harmonize with each other/ ie: have coincident modes or harmonics, right?
As for the 1:1.33:1.64 ratio, I plugged it into the bobgolds.com modecalc and I was amazed at the results. It seemed to have good distribution down to around 60Hz, it passed all the R. Walker BBC tests, the Bonello test looked great, and it was 2028cuft vol. I couldn't imagine it being much better! I see what you're saying about the coinciding harmonics, but why did they not show up on the modecalc as problems, and how could they be that big of an issue when all the tests look so good?
I really appreciate your time!
Nathan Webb