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4th December 2012, 02:58 AM  #1 
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Join Date: Mar 2011
Location: Somewhere in Quebec

golden ratio. I dont get it
hi
my dimension for my bass (30 to 300hz) enclosure requirement is that the box is no more then 38cm wide and 82 heigt. I want to have around 110 liter. I dont know I to make the golden ratio, can anyone help thanks 
4th December 2012, 03:10 AM  #2 
frugalphile(tm)
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38 x 61.5 x 99.5 is golden ratio. If 18 mm ply, gross volume would be 191 litres,
If we start with 110 litre add 5 litre for bracing and back of driver then: 115 litre = 115,000 cm^3. Take the cube root = 48.6 48.6 x 1.618 = 78.7 48.6 / 1.618 = 30 So interior dimensions of 30 x 48.6 x 78.7 cm dave
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4th December 2012, 10:27 AM  #3 
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I don't get it either.
The golden ratio was originally for visually pleasing proportions. Put proper absorption in the cabinet (fiberglass) and don't worry about the dimension ratios. David 
4th December 2012, 10:33 AM  #4  
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4th December 2012, 10:35 AM  #5 
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The golden ratio spreads the internal standing waves in the frequency domain (ie they don't overlap, both the base and the harmonics). This is useful for midrange but not so much for bass as the wavelengths involved are usually much larger then the enclosure size.
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4th December 2012, 10:51 AM  #6  
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4th December 2012, 02:10 PM  #7 
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I've wondered about this, too. If you're just modeling a flat baffle for diffraction purposes (say for an OB), seems like the "golden ratio" doesn't produce an optimal response in sim. Might be fine to start there though.

4th December 2012, 02:21 PM  #8 
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When it comes to room acoustics, use of the GR to position speakers can be helpful.
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4th December 2012, 02:56 PM  #9 
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Wasn't it for concert halls? Unlike Victorian structures, such as the Albert Hall.

4th December 2012, 05:23 PM  #10 
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I always thought it was observed in ancient egyptian design, adopted by the greeks, and used visually to proportion windows, paintings etc. Ive never tested if it really works in acoustics. My favourite adaptation of GL is to halve the longest length, calculating for twice the volume. Its a nice way to get a more cubelike shape. Of course standing waves would be more bunched up, but i never heard a problem. GL is better than guesswork, or breaking the 'rules' i.e. W equally a third H for example.
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