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64.12.116.7
In Reply to: Technical Coupling Q's posted by Cuppa Joe on November 08, 2004 at 21:51:49:
Perfect coupling tales place when either of two circumstances are present: the driver center to center is no more than 1 wavelength at the highest radiated frequency or the radiating area comprises at least 80% of the vertical plane. But practically speaking a wavelength to wavelength between radiating planes is usually adequate; integration may not take place until a wavelength or so from the radiating plane, but unless you're listening to it that close it matters little. Even when the radiating plane to radiating plane distance is over a wavelength integration takes place at some point.Because of driver frame widths perfect integration at 10 kHz, for example, is difficult with a 1.3 inch wavelength, but even if integration takes place 10 wavelengths from the radiating plane that's still only 13 inches.
Follow Ups:
Thanks, guys! The conclusions Bill cites are from an AES paper
by Christian Heil concerning the V-DOSC line array, if I'm not
mistaken. However, John Murphy of True Audio (creator of the
MacSpeakerz and WinSpeakerz programs) claims that true
coupling of two like drivers only occurs at 1/2 the wavelength.
Not being so well educated in engineering disciplines as I
should be for such a discussion, I sometimes allow opinion to sway my decisions. So, I guess that the real question is: What
occurs between the 1/2 WL and the full WL that divides the two
schools of thought? Both of you are welcome to take another
crack at it! -Cuppa Joe
"true coupling" takes place at the radiating plane with no null points between the sources. It's a nice thing to have at low frequencies, difficult to achieve at high frequencies,and all in all not worth losing sleep over in real world applications above 5kHz or so.
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