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Author Topic: Recommend some horn loaded long throw boxes  (Read 21246 times)

Jeff Bankston

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Re: Recommend some horn loaded long throw boxes
« Reply #30 on: May 24, 2017, 05:50:34 pm »

Wouldn't that mean at 1m it was roughly 155dB?
probably. but it was a lot of boxes so the spl would have been very high at 1m. and they were very high above people heads. and the wind didnt blow against them. i have heard loud car stereos from over 300 feet.
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Ivan Beaver

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Re: Recommend some horn loaded long throw boxes
« Reply #31 on: May 24, 2017, 07:10:40 pm »

Wouldn't that mean at 1m it was roughly 155dB?
No.

It "could" mean that-IF all of the sound came from one place.

But as you can see, the sources of sound were spread out quite a bit.

So the individual sources were much lower in level.

At a far distance the distances between the sources
This of course does not mean it sounded good at that distance, only that they measured that level of TOTAL sound at that location (PA plus outside noise)

Once again, the "Simple numbers" don't tell the whole story and can lead to wrong answers.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
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Jim McKeveny

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Re: Recommend some horn loaded long throw boxes
« Reply #32 on: May 25, 2017, 08:25:11 am »

Can we please retire the expression "Long Throw"?
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Craig Hauber

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Re: Recommend some horn loaded long throw boxes
« Reply #33 on: May 25, 2017, 09:33:52 am »

1990 called... they want their audio systems back.


Sent from my iPhone using Tapatalk Pro

The "74" in the name Caljam was the year.  You are off by a couple decades.

I do think that Tycobrae design was (and still is) one of the most popular configurations of PA boxes though, even through all those decades.  Who here hasn't ran or mixed on a dual-15 JBL-loaded box sometime in their life?
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Craig Hauber
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Scott Olewiler

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Re: Recommend some horn loaded long throw boxes
« Reply #34 on: May 25, 2017, 09:55:59 am »

Can we please retire the expression "Long Throw"?

Playing Devils Advocate - Are not some speakers louder at distance then others with the same startng SPL?  Or just more coherent sounding?

If we put a SRM450 beside an SM80 playing the same source material at the same SPL at 1 meter, is the SM80 louder at 50 meters, or is it just more coherent and thus sounds louder?
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Casey McDonald

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Re: Recommend some horn loaded long throw boxes
« Reply #35 on: May 25, 2017, 10:52:59 am »

Fulcrum Acoustic AH96 or AH65 depending on dispersion required. 

A football field is 300', so if you lose 6 db per doubling, you will lose around 40 db at 300' vs the 1M rating. That's not taking into account wind or hf absorption loss.

Yes exactly - or to put that in absolute terms for the source to be heard clearly at one end - say 80dB (??) it would be around 120dB at the source, which seems like a fairly formal sound level for the people up close.  You may end up with a no-mans land close to the PA and lose a bunch of square footage.  This is what a person would be asking from a single style cabinet covering the length of the field, no matter what it is... although a better sounding speaker at 1m may make the high levels less offensive (??) and more intelligible at distance (??)

Another idea on the outside chance, if the site and the organizers are conducive, set up on the wide end and use the 4x speakers you already have for a short and wide coverage.

Casey



« Last Edit: May 25, 2017, 10:56:09 am by Casey McDonald »
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Mark Wilkinson

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Re: Recommend some horn loaded long throw boxes
« Reply #36 on: May 25, 2017, 02:40:47 pm »

Are not some speakers louder at distance then others with the same startng SPL? 


On axis for both....my 'understanding' is no, one speaker will not be louder than another with the same starting spl taken at the same distance.
(provided starting spl is from equal frequency ranges with relatively flat magnitude response thru the ranges, and that the chosen starting distance is past the nearfield for both speakers...)
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Tom Danley

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Re: Recommend some horn loaded long throw boxes
« Reply #37 on: May 25, 2017, 04:55:47 pm »

Playing Devils Advocate - Are not some speakers louder at distance then others with the same startng SPL?  Or just more coherent sounding?

If we put a SRM450 beside an SM80 playing the same source material at the same SPL at 1 meter, is the SM80 louder at 50 meters, or is it just more coherent and thus sounds louder?

Hi
A loudspeaker that radiates an interference pattern (exhibits destructive interference) does normally change its timber or spectral balance as a function of distance and position and is strongly affected by wind moving the interference pattern around.     

A single acoustic source like an sm-80 sounds essentially the same at any distance sans excess hf absorption and SPL fall off from inverse square law and is MUCH less affected by wind..  Reaching the far end of a foot ball field with great sound is no problem, happens all the time.
Tom
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Stephen Kirby

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Re: Recommend some horn loaded long throw boxes
« Reply #38 on: May 25, 2017, 06:40:34 pm »

Playing Devils Advocate - Are not some speakers louder at distance then others with the same startng SPL?  Or just more coherent sounding?

If we put a SRM450 beside an SM80 playing the same source material at the same SPL at 1 meter, is the SM80 louder at 50 meters, or is it just more coherent and thus sounds louder?
The coax will be more coherent.  The SM80 will have better pattern control.  So that above a frequency dictated by the horn angle and mouth size the energy radiated will primarily be within that pattern.  A 15" two way with a high crossover point will have very inconsistent pattern so that at distance the apparent frequency response will be different than up close.  Which will affect intelligibility.

My understanding is that a large horn with a narrower pattern will contain the energy within a smaller area, meaning that it will appear to have more energy at a distance than something that distributes the same energy over a wider area.
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Jonathan Betts

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Re: Recommend some horn loaded long throw boxes
« Reply #39 on: May 25, 2017, 06:47:06 pm »

The coax will be more coherent.  The SM80 will have better pattern control.  So that above a frequency dictated by the horn angle and mouth size the energy radiated will primarily be within that pattern.  A 15" two way with a high crossover point will have very inconsistent pattern so that at distance the apparent frequency response will be different than up close.  Which will affect intelligibility.

My understanding is that a large horn with a narrower pattern will contain the energy within a smaller area, meaning that it will appear to have more energy at a distance than something that distributes the same energy over a wider area.


Pile a whole bunch of subs underneath one and you have a quality, easy to deploy,  high output system. I don't miss my KF 650's at all.
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ProSoundWeb Community

Re: Recommend some horn loaded long throw boxes
« Reply #39 on: May 25, 2017, 06:47:06 pm »


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