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Also, these box sizes are H, W, D and are based on the Golden Ratio. If you want the Acoustic Ratio, the multipliers are: 1.2599, 1.0, 0.7937 where the common measurement between both ratios is the Width (x 1.0).
The difference between the two can be likened to old style (70’s era) generic box speakers and the newer, fatter, style speakers. While the Acoustic Ratio is supposed to be a bit better sounding, the Golden Ratio works better when your space is depth challenged.