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Why is everyone building cube subwoofers? Why not proportioned on the golden ratio for a speaker cabinet .62:1:1.62 ?
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Re: 20" cube, 3.2 CuFt sealed 15" Dayton Titanic MKIII

The golden ratio doesn't apply to "most" subwoofers. The golden ratio applies to speaker building where an internal dimension is one half a frequencies wavelength and standing waves can form. In a sub the shortest wave length would be 100 hz which is 11 feet. If one dimension is 5.5 feet then theoretically it could be a problem. But in a cabinet that size lots of bracing would be used which would break up the standing wave. Plus it's usually recommended on really large sub cabinets to apply 3 or 4 inches of compressed insulation on one end of the long side to ensure no standing waves are formed.

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My opinion is that the golden ratio is more applicable the the shape of the listening room than the speaker box. My assumption is based upon sound studies that were conducted over 25 years ago, but I believe they are still valid...
 
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