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MultiWay Conventional loudspeakers with crossovers 

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4th December 2012, 07:06 PM  #11 
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Join Date: Feb 2010
Location: in half space

Another skeptic, here.
As Mark said, the theory is, the standing wave harmonics will be evenly distributed, but this merely means they will retain the maximum possible energy. I think a more sophisticated cabinet design would cause the standing waves to cancel each other. I think there's nothing special about 1.6180339..... I think any irrational number will do. I also think if you were to try to design a box where the standing waves reinforced each other, you would find it quite difficult, and due to braces and battens, etc., you would not end up with 1' x 2' x 4'. 
4th December 2012, 08:21 PM  #12 
frugalphile(tm)
diyAudio Moderator

Just don't use it twice or you end up with the long dimension twice the smallest one.
I don't hold fast to the golden ratio, but do use irrational numbers to determine aspect ratios of rectangular boes. dave
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4th December 2012, 08:34 PM  #13 
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Here is a neat calculator. Just give a desired midvalue and you'll get the smaller and bigger numbers
Golden Ratio Calculator
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4th December 2012, 08:46 PM  #14 
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GR is so much more...
...than just visually appealing. It's defined as
GR:=[1 +/ (5)^3]/2 Our bodies are formed using this ratio, as well as most everything in nature. Strictly speaking, it is the one "perfect ratio". The Fibanicci series becomes this at the limit as x>0 (IIRC). P10's statement regarding the use of irrational numbers as ratios is for all practical purposes suitable.
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4th December 2012, 09:20 PM  #15  
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Quote:
Again, with enclosures, it only makes sense to worry about the distribution of resonances if you plan to do nothing about them. Since internal stuffing can do a good job of damping I wouldn't worry about exact dimension ratios. David S. 

4th December 2012, 09:26 PM  #16  
frugalphile(tm)
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Quote:
dave
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4th December 2012, 09:36 PM  #17 
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Join Date: Nov 2009
Location: The Mountain, Framingham

It doesn't hurt in a "belt and suspenders" sort of way (braces for the Brits). Still, the only time I've seen standing waves that defied treatment was with very tall towers, i.e. with extreme aspect ratios. With cabinets close to the usual 2 cubes high ratios I find good absorptive material (FG and Rock Wool) do a pretty good job, even as linings.
David S. 
4th December 2012, 11:18 PM  #18 
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5th December 2012, 12:24 AM  #19 
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Join Date: Feb 2010
Location: in half space

Given my carpentry skills, the numbers are going to be irrational no matter what I do.

5th December 2012, 12:28 AM  #20  
frugalphile(tm)
diyAudio Moderator

Quote:
And if you have a tower with an extreme aspect ratio you need to treat it as an MLTL not a BR, and you usually want to take advantage of the 1/4 wave resonance to get more/lower bass extension. dave
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