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RE: Mmmm "it already is phase-coherent resulting from the drivers all being on the same physical plane." ...

Posted by Satie (A) on April 3, 2015 at 07:09:25

In Reply to: RE: Mmmm "it already is phase-coherent resulting from the drivers all being on the same physical plane." ... posted by Davey on April 2, 2015 at 22:43:25:

I don't think there is a vertical component to the output of a line source as far as near field listening is concerned. Meaning that the contribution of the output from the top of the driver and the bottom of the driver does not reach the listener at significant contribution to SPL Those portions simply maintain the cylindrical waveform.

Griffin discussed this in a post here a decade ago.

http://www.audioasylum.com/cgi/t.mpl?f=mug&m=67308

Here is a live URL of his paper

http://www.diy-audio.narod.ru/litr/nflawp.pdf

This means that within the near field, which would be down to 500-600hz on a maggie at 10' there should be the possibility to obtain time coherence within the frequencies important for time domain perception (localization and thus imaging). If successful array extension by reflection off the ceiling and floor are contributing (which in most cases you don't have since the drivers have so little output in the vertical dimension) then you simply have a lower transition freq from near to far field.

As Helmhotz and Guitar Slim demonstrated with their DEQX time alignment of drivers to get rather nice time alignment with the impulse response within 0.1 ms for all the drivers together. The time smear of the line source is negligible and needs no correction by concave shaping of it. The departure from line to concave line produces more of a point source effect which works against image height rendition. One of the advantages of a line array over a box full of drivers covering different freq., time aligned or not

http://www.audioasylum.com/cgi/t.mpl?f=mug&m=192759

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