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In Reply to: Re: I have no anti-utilitarian bias posted by mauimusicman on February 23, 2007 at 16:51:56:
"Phase/time coherent and PA systems do not go together, for true time/phase alignment can come only by using a 1st order crossover."
A false premise. The use of digital crossovers allows the use of high order crossovers without the phase problems of high order analog crossovers.Ed Long and Doug Stax claimed phase coherency, or at least time alingment, with Long's Urei monitors and Stax's Mastering Lab crossovers for the Altec 604 coax, this was the setup in the Big Reds.
Tom Danley makes phase coherent PA gear and understands this issue on a level far over my head. There is some info from Tom over on the HE asylum right now about his take on this. If you want to go over there and question him, he can explain it far better than I.
Follow Ups:
Steep slope filters are what cause the majority of phase shift in loudspeakers, be it digital or analog filters.
The Dolby Lake processor has linear phase filters. Linear phase digital filters is probably what Tom is referring to with digital filters.
To utilize a horn enclosure containing all of the drivers in the same "mouth" intended to address the usual challenges of dissimilar radiation patterns and incoherency. And clever guy that he is, fashion the enclosure in a trapezoidal shape to easily accommodate multiple bins for large arrays.
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