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[Austin Parker]

Someone clue me in. While I'm out in some of the local watering holes I have seen many different types of speaker installs. Everything from 70v, to flying pa. One thing that gets my attention is that a few of these places use  EV speakers, and they have the speakers mounted in pairs all over the venue. To make things even a bit more interesting the pairs usually have one speaker mounted upside down in comparison to the other - that is to say instead of mounting parallel horn to horn, they are mounted parallel horn to woofer. Why? Is this a common attempt at combining horizontal and vertical pa hanging techniques? it seems like they are built as a 'parallel narrow long throw'

[Ivan Beaver]

Which models?  Are they hard packed?

I cannot think of any reason other than a particular installer trying to put a siguature look to their install-without regards to performance.

Chances are that by doing this (without knowing anything other thant he information given) you are creating lots of combfiltering.

But hey-you are talking about his install, maybe that was his plan all along?

It is so much more about looking cool than actually performing well isn't it?

[Austin Parker]

Ivan Beaver wrote on Sun, 28 May 2006 11:35

Which models?  Are they hard packed? I cannot think of any reason other than a particular installer trying to put a siguature look to their install-without regards to performance. Chances are that by doing this (without knowing anything other thant he information given) you are creating lots of combfiltering. But hey-you are talking about his install, maybe that was his plan all along? It is so much more about looking cool than actually performing well isn't it?

I wasn't able to catch the model, but they are your standard high frequency horn driver with a 15" woofer. Yes they are hard packed. Originally I thought that maybe it was done for better high frequency dispersion - with the horns being mounted in such a manner (but since they are mounted very high, almost on the ceiling, i dont think that would matter)

[Mac Kerr]

Austin Parker wrote on Sun, 28 May 2006 02:58

One thing that gets my attention is that a few of these places use  EV speakers, and they have the speakers mounted in pairs all over the venue. To make things even a bit more interesting the pairs usually have one speaker mounted upside down in comparison to the other - that is to say instead of mounting parallel horn to horn, they are mounted parallel horn to woofer. Why? Is this a common attempt at combining horizontal and vertical pa hanging techniques? it seems like they are built as a 'parallel narrow long throw'

It is a fairly common misguided attempt to eliminate the comb filtering where the horns and woofers combine. It doesn't eliminate it, it just moves it into a different plane.

Mac

[Ivan Beaver]

Yeah the problem is not just in the horizontal plane, but now both the vertical AND horizontal planes. Not to mention the diagional coverage.

Yes he probably did increase the vertical coverage a bit, about a foot or two.  I'm sure that made all the difference in coverage.

[Austin Parker]

So it's junk? Combining the horn and woofer to cancel comb filtering? That's new....

[Michael 'Bink' Knowles]

Ivan Beaver wrote on Sun, 28 May 2006 09:39

Yeah the problem is not just in the horizontal plane, but now both the vertical AND horizontal planes. Not to mention the diagional coverage...

A local guy I've worked with does exactly this with Meyer UPAs and Apogee AE-5s. Probably does it with other 2-way speakers as well. I would LOVE to see a CLF diagram of the resulting coverage pattern.

-Bink

[Mac Kerr]

Austin Parker wrote on Sun, 28 May 2006 12:43

So it's junk? Combining the horn and woofer to cancel comb filtering? That's new....

I don't know quite what you mean, but anytime the output 2 speakers producing the same audio combine there will be comb filtering due to the in phase, out of phase combining. People who turn one speaker upside down mistakenly think that they no longer combine. The different relationship of the horns to each other, and the woofers to each other, will change the way the comb filtering happens, but it will not eliminate it.

Mac

[Ivan Beaver]

Here is a pair of close packed UPA1's ( 1 upside down) at 2KHz modeled in EASE.

[Michael 'Bink' Knowles]

Nice pattern... kind of Art Deco or Streamline Moderne.  

-Bink