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Author Topic: Long vs short throw boxes  (Read 25240 times)

Mac Kerr

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Re: Long vs short throw boxes???
« Reply #20 on: March 27, 2011, 10:35:30 PM »

My original point for the original poster was that if the pattern was too tight and the targets too close, there would be hot and cold spots. Unless there are adequate tight coverage horns to be aimed to cover the targets. The install in question was a disaster, and a very expensive one. As I recall, the install was $140,000 about 1987. I don't remember the name of the contractor, but they were highly recommended for church installs at the time. This was their first shot at a concrete dome, and it didn't work. They had a couple of the shorter horns in that series aimed down at the stage for monitors. That also did not work at all.

And my original point was that the problem was not that the horns were too narrow, they were badly aimed. Those 10 40º horns can cover 360º with no gaps. There is no such thing as a long throw horn that does not work up close within its coverage pattern. Long throw horns do not "develop" at some theoretical distance.

Mac
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duane massey

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Re: Long vs short throw boxes
« Reply #21 on: March 28, 2011, 12:47:28 AM »

Houston has had a number of poorly designed and/or installed systems in churches and schools. It's probably no coincidence that most of the companies that pursued that market are out of business.
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Duane Massey
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David Parker

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Re: Long vs short throw boxes
« Reply #22 on: March 28, 2011, 06:35:16 AM »

Houston has had a number of poorly designed and/or installed systems in churches and schools. It's probably no coincidence that most of the companies that pursued that market are out of business.

When these horns were in their heyday http://www.jblpro.com/pub/obsolete/23606566.pdf I saw them in MANY churches, and nobody was happy with them. The typical install in a 400 seat auditorium was to have two of them mounted together up in the top of the steep V ceiling (basically up in the rafters), pointed down, one at the front and one aimed more to the rear. There would be a low frequency cab also located up at the top near them.
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Tim Weaver

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Re: Long vs short throw boxes
« Reply #23 on: March 29, 2011, 04:56:20 PM »


Back to the OP's question, the problem you are having is one of "suitable listening distance". It's the same problem faced by designers of studio monitors. There are nearfield monitors and farfield monitors. The largest Nearfields you see are usually 8" woofer two way systems. 2 way systems with larger low freq drivers are extremely difficult to design crossovers for due to the difference in radiation patterns between the LF and the HF.

You will also see that NF monitors use dome tweeters instead of horns in order to have a radiation pattern that matches the woofer better. The idea is to have (as much as possible) spherical radiation from both drive units at the frequencies they are playing. The small woofs will give you a much higher possible crossover point before they begin to narrow their radiation pattern.

How this all pertains to your drum monitor is that the drummer is sitting in the "nearfield" and you at the desk are not. The Eons are not designed with nearfield listening in mind. Therefore the drummer is getting a wildly skewed, lumpy frequecy response. To the credit of the eons, most 15" x 1" horn pro audio cabinets will have this same problem. A 15" woofer is a great compromise between acceptable freq response and high efficiency, but it typically makes a terrible low/mid for a 2 way cabinet.

My suggestion is to either back the monitor up several feet, or run a 3 way drum fill with a sub and a small 2 way cabinet. A 10/1" monitor on top of an 18" sub works pretty well, given that all the components are of decent quality. If you can find a small monitor with a conical wave guide you might be a little better off than one with a rectangular horn, but as always, give it a listen to see if it sounds good up close.
« Last Edit: March 29, 2011, 05:17:38 PM by Tim Weaver »
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Re: Long vs short throw boxes
« Reply #23 on: March 29, 2011, 04:56:20 PM »


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