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12 line array cab plan

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toastyghost View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 17 January 2019 at 5:20pm
I've shown what happens on the rest of the spectrum, there are broadband and multiple octave plots displayed as well. If there are issues present with the 'best of the best' of line arrays, you can be damn sure they're in 'lesser' boxes too.

I chose 2k because that is what is commonly used by most manufacturers and installers, because it is a central speech frequency, and should sit right within the waveguide pattern, so again, if it doesn't have good pattern control there, it's generally going to be worse everywhere else.

People are of course welcome to spend their own 2000+ euros on a copy of EASE to do their own sims
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MattStolton View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2019 at 10:52am
Have you ever heard/worked with any of the alcons audio boxes?

In theory, at least the HF, being a long ribbon, it should be trying to create a cylindrical wave-front from source. They deliberately "stack" the ribbons in LA hangs, as close as possible to each other, and claim this maintains coherence between adjacent HFs.

We all know what to think about manufacturer claims, but I can see some physics in the spiel.

Much as the HF claims to be sorted, your still left with bass/mid from conventional drivers so total line length will dictate LA behaviours in the lower frequencies. And Ribbons don't go that low, even the big Alcon's ones...

However, they have engineered in some durability and sensitivity, the normal flaws of ribbons, to make them at least as resilient/loud as traditional comp drivers, and they do an 18" ribbon which will go quite "low". They offer waterfall plots of the 6" doing 1-20KHz, so low enough? One area of suspicion is no reference anywhere, for any cabinet, at what frequency they cross to HF, that I can find.

However, as you mentioned about HF "doing -3db" where mid bass do "-6dB", they do publish Fresnel/Fraunhofer data clearly stating at what frequency, vs how long the line array is, the extent of breaking the inverse square law:

For their baby LR7/90 LA box, pdf here: https://www.alconsaudio.com/wp-content/plugins/download-attachments/includes/download.php?id=371

Refreshing honesty from a manufacturer, but also nice to see that unless the line is very long, you get no breaking of inverse square law, at relatively high frequencies. Given a single box offers some cylindrical wavefront from 2K, suggests HF crosses just below?
Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains"
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