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Author Topic: The science of line arrays...  (Read 6879 times)

John Roberts {JR}

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Re: The science of line arrays...
« Reply #20 on: October 12, 2015, 01:39:06 pm »

  You can't get deep sleep from 5 minute naps.  It takes a much larger waveguide...
There are at least two different things occurring while we sleep.

#1 the brain recharges sugar stores. This occurs whenever the brain can take in more than it is burning so brief cat naps can be very helpful.

#2 the brain organizes (re-organizes?) new data. This is when daily lessons get burned into memory like students learning new topics. Extraneous data also gets discarded while sleeping. The brain's attempt to make sense of random discarded data is the raw material for dreams.

Surely more than just these two but dream sleep requires longer uninterrupted rest periods to properly process (at least a couple hours). Inability to clear the decks of discarded data could clog the cognition machinery.

JR
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When in doubt do what's right.

Ivan Beaver

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Re: The science of line arrays...
« Reply #21 on: October 13, 2015, 07:52:52 am »

Two ways I can think of.  If the frequency is divided by ten, the length is multiplied by ten. e.g. about ten feet.

Or pretend it's the length of organ pipes (or strings) and go down in octaves:

1000Hz = 1'
500Hz = 2'
250Hz = 4'
125Hz = 8'

So guess 100Hz to be about 10'


Steve.

Yeah- you just remember 1 number and then divide or multiply as needed to get "close enough".
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Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

Scott.Sugden

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Re: The science of line arrays...
« Reply #22 on: October 13, 2015, 01:42:17 pm »

As I've been taught over the years about how intensity shading is bad for line arrays, what about fixed angles? I've read how most manufactures created a "fixed" angle line array to take out the calculations (aka dumb-a-fy) of doing a proper line array. But two boxes doesn't make a line array, as well as fixed angles. So why have portable line array's that are fixed angles? Just so you can offer a line array?

Your thoughts?

Great question Al,

There are several reasons that inter array gain shading is a bad idea. In no particular order.

The stability of the cancellation off axis (generally above and below) of the array. Generally speaking one of the significant advantages to a line source array is the stability in the coverage zone and the consistent rejection in the non-coverage zone.

The way a line source array works is that the further you move away the more of the line you get to hear. By gain shading the array you reduce the total potential of the array when you need it the most. This difference in potential offsets some of the local advantages (reduction in SPL) experienced in the targeted reduction zone. 

These two trade offs (and a few more) need to be considered when choosing to shade the array. With any speaker the difference between the short and long throw is always of significant concern.

Like fire if you get to close it gets hot.

Scott Sugden
Head of Applications, Touring
USA + CANADA

L-Acoustics
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Re: The science of line arrays...
« Reply #22 on: October 13, 2015, 01:42:17 pm »


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