Speaker Asylum

Re: I have no anti-utilitarian bias

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In Reply to: Re: I have no anti-utilitarian bias posted by Tom Brennan on February 23, 2007 at 15:27:00:

Phase/time coherent and PA systems do not go together, for true time/phase alignment can come only by using a 1st order crossover. I know of no PA speaker systems that utilize 1st oder crossovers. It would be counterproductive to do so, as PA speaker systems need to be designed for very high power handling capacities, and generally use high order filters to achive this. Can you show me a 1st order crossover PA system? Give me a link.

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Re: I have no anti-utilitarian bias - Tom Brennan 17:08:08 02/23/07 (3)
"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.
Go over and talk to Tom.
- Re: I have no anti-utilitarian bias - mauimusicman 19:13:19 02/23/07 (1)
  Steep slope filters are what cause the majority of phase shift in loudspeakers, be it digital or analog filters.
  - Re: I have no anti-utilitarian bias - Ben P 21:32:04 02/23/07 (0)
    The Dolby Lake processor has linear phase filters. Linear phase digital filters is probably what Tom is referring to with digital filters.
- His designs are most intruiging - E-Stat 18:22:58 02/23/07 (0)
  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.
  rw

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