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Re: From the Cardas site:

Posted by Mart (B) on November 19, 2004 at 12:14:10

In Reply to: From the Cardas site: posted by Al Sekela on November 19, 2004 at 09:58:23:

Yeah, that side wave dipolar cancelation was my unstanding. I maximized it by toing-in the speakers to position the null at the 1st reflection point. I still don't grasp the application of the classic golden 0.618:1:1.618 cube ratio being employed by dipolars. It is the speaker enclosure interior acoustic space ratio to overlap 3D standing-waves to flatten response. FWIW, the actual equation is (Sqrt[5] ± 1)/2

The reason for the equal spacing for rear walls is to cancel the 1st principle reflections. That is, ideally, the out-of-phase sound "reflected off the rear wall behind the speakers" cancels the in-phase sound "reflected off the rear wall behind the listener". It's another null. The equidistance translates into a time-aligned, equal & opposite signals.

PS: Your ratios are quite well suited for narrow rather than wide rooms (IE: short wall vs long wall) positioning.

... just my 2¢

♪ moderate Mart £ ♫

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