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Author Topic: Lime Arrays that advertise digital steering. How does this actually work ?  (Read 4265 times)

Mal Brown

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I'm just curious.

Thx!
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Jonathan Goodall

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That type of array works best in segments, it makes it easier to use digital manipulation to squeeze the output into a defined area (eg glass atrium).  :)
« Last Edit: April 25, 2020, 09:20:23 pm by Jonathan Goodall »
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Caleb Dueck

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I'm just curious.

Thx!

I believe it's a mix of all-pass filters, delay shading, gain shading, and some drivers out of phase to actively "kill" lobes. 
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Landon Lewsaw

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That type of array works best in segments, it makes it easier to use digital manipulation to squeeze the output into a defined area (eg glass atrium).  :)


Lemon arrays are the next big thing...
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Tim McCulloch

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I'm just curious.

Thx!

A whole lime would be a lime array, as the individual segments make up the whole. ;)

But there are 3 vertical arrays that use electronics to move things - EAW's ANYA/ANNA, Martin's MLA, and d&b's G/K SL series.  Each implements time, amplitude and equalization in different ways to achieve their end result.

I'm reasonably certain that all of the manufacturers have white papers or other discussion of their technology...
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David Sturzenbecher

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A whole lime would be a lime array, as the individual segments make up the whole. ;)

But there are 3 vertical arrays that use electronics to move things - EAW's ANYA/ANNA, Martin's MLA, and d&b's G/K SL series.  Each implements time, amplitude and equalization in different ways to achieve their end result.

I'm reasonably certain that all of the manufacturers have white papers or other discussion of their technology...

Donít forget nearly every steerable column speaker. Renkus Heinz Iconyx is the biggest player but there are many others.
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Tim McCulloch

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Donít forget nearly every steerable column speaker. Renkus Heinz Iconyx is the biggest player but there are many others.

Would those be the lemon arrays that Landon was mentioning? 8)

It's getting kind of citrus-y in here...
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"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Mike Caldwell

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Donít forget nearly every steerable column speaker. Renkus Heinz Iconyx is the biggest player but there are many others.

The steerable columns I have worked with (Tannoy & Intellavox) were only "steerable" in the vertical pattern, and the control software lets say needed some streamlining!

Helge A Bentsen

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Gsl/ksl is ęsteering on top of a connentional linearrayĽ. You can optimize it a bit, but it has itís limits. You still need to calculate and pin it as a conventional system.
MLA/WP from Martin can be used as a ęconventionalĽ line array, but can be optimimized with great results. Still have to calc an pin it as a conventional system, but you can optimize coverage afterwards with great results.
EAW Adaptive canít be used as a conventional line array, it has to be steered and has the most impressive performance Iíve ever used. Martin getís close, but Adaptive can do some coverage stuff thatís amazing. Adaptive goes up at 0 degrees, you can fly it and adjust coverage afterwards. Huge time saver, a qualified rigger and stage hands can fly a system hours before you arrive to adjust trim levels and set coverage.

A friend of mine did audience sound for a tv show, live bands in an aircraft hangar.
During rehersal the tv bus called him on coms and asked when heís going to turn on the PA. They couldnít hear the bleed like they used to.

Disclamer: I havenít personally used GSL/Anya, but Iíve used the other systems several times.
« Last Edit: April 26, 2020, 03:40:47 am by Helge A Bentsen »
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Peter Morris

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I'm just curious.

Thx!

In its simplest form beam steering is done with delay. It can provide a virtually curve to the array as shown below, hence steer the sound.

As I understand EAW Anaya works more or like this as does their first version of this technology the DSA250. They also included a lot of addition features to ensure even optimized coverage across the audience area.

Systems such as Martinís MLA, D&B array processing and AFMGís FIR maker are slightly different. They are not really beam steering protocols.

They require the array to be physically curved, but optimize the performance on the listening plane.  They look at the vectors that describe the 3D performance of the drivers/speaker at all frequencies.Ė see one set of 3kHz vectors represented graphically below.

By modifying the delay, amplitude and phase of individual drivers or speakers you can optimise the arrivals on the listening plain.  This is done with some cleaver mathematical optimization algorithms that eventually generate a set of FIR filter tap coefficients. These are loaded in to the systems processors.

Given this amount of control they have with this approach they can also do limited beam steering.

« Last Edit: May 16, 2020, 05:16:39 am by Peter Morris »
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ProSoundWeb Community

Re: Lime Arrays that advertise digital steering. How does this actually work ?
¬ę Reply #9 on: April 26, 2020, 04:35:02 am ¬Ľ


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