Pro Audio Asylum

Posted by tomservo (M) on November 10, 2004 at 13:51:54

In Reply to: Technical Coupling Q's posted by Cuppa Joe on November 08, 2004 at 21:51:49:

Hi

If has a program which predicts the dispersion pattern then one can see that ideal coupling happens when the center to center distance from two point sources are less than 1/4 wl apart. Mutual coupling of woofer is limited to this region for example.
At 1/3 wl CC one see's a forward lobe, at 1/2 wl one has a figure eight pattern. Greater separations result in spider like polar measurements and as the wavelength spacing increases, the number of legs increase.

Fwiw, this 1/4 wl CC requirement is half that cited by one of the big manufactures of concert line arrays, good thing they didn't model or measure the assertion.
Cheers

Tom Danley