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Old 22nd February 2012, 06:01 PM   #1
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Default Line array - correct spacing of drivers + focal curvature

hi,

is there a calculator for figuring out the correct spacing of drivers in a line array to avoid comb filter etc etc?

thanks for your help
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Old 22nd February 2012, 06:04 PM   #2
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do a search and read Jim Griffin's ecxelent paper on the subject!!
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Old 22nd February 2012, 06:12 PM   #3
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Originally Posted by Leonidas View Post
do a search and read Jim Griffin's ecxelent paper on the subject!!
what search string? i've already do lots of searches and only start threads and ask when i can't find what i need.
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Old 22nd February 2012, 06:22 PM   #4
Budgie is offline Budgie  United States
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http://www.diy-audio.narod.ru/litr/nflawp.pdf
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Old 22nd February 2012, 06:34 PM   #5
kctess5 is offline kctess5  United States
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The correct spacing is as close as you can possibly get them. This won't eliminate comb filtering just push it up in frequency. This is why smaller drivers are prefered. Most line arrays need tweeters for the upper ranges because of this
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Old 22nd February 2012, 06:58 PM   #6
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Originally Posted by kctess5 View Post
The correct spacing is as close as you can possibly get them. This won't eliminate comb filtering just push it up in frequency. This is why smaller drivers are prefered. Most line arrays need tweeters for the upper ranges because of this
well the driver i was looking at is a cheapy one that has most say has quite a lot of high end to it, so perhaps the comb filtering in the upper range would be a good thing?

as close together as possible makes that a bit simpler.
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Old 22nd February 2012, 06:59 PM   #7
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Originally Posted by Budgie View Post
thanks reading now.
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Old 22nd February 2012, 08:07 PM   #8
kctess5 is offline kctess5  United States
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It will be more clear when you read that but its not just overall attenuation. It's a combination of constructive and destuctive interference between the drivers making the response go up and down, almost like tines in a comb, hence the name
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Old 22nd February 2012, 09:42 PM   #9
adason is offline adason  United States
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see CBT (constant bamwidth transducer) by Don Keele on you tube, posted by parts express, it compares straight array with curved one and the effect on comb and directionality
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