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Loudspeaker coverage / dispersion

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rupture View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rupture Quote  Post ReplyReply Direct Link To This Post Topic: Loudspeaker coverage / dispersion
    Posted: 18 December 2007 at 11:06am
Tried this in the general forum with no luck:

Used to have some good links (but not any more) explaining how to calculate splay angles for cabs to achieve optimum coverage, based on dispersion angles.

Anyone care to point me in the right direction, or explain this is done?

Thanks

Julian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2007 at 3:03pm
Ideally unless you have very tight dispersion from each cabinet splaying is the ultimate sin, read this and see why

http://billfitzmaurice.com/phpBB2/viewtopic.php?t=1293
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

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Post Options Post Options   Thanks (0) Thanks(0)   Quote josh Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2007 at 3:17pm
Very interesting....what would you class as a tight enough dispersion to allow you to array cabinets
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2007 at 4:42pm
Void Stasys 3, Porn Horn probably no more than 30/40 degrees and controlled dispersion throughout the majority of the bandwidth which can only come from quite long horns

If you look at the Porn horns recommended splaying on the proaudioparts webpage link to it, it shows the sort of spacing you need from a narrow dispersion cabinet. Now translate that to a reflex cabinet which has variable dispersion throughout its entire bandwidth and you have a recipe for disaster!

Stu


All you need to know is:
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveAATW Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2007 at 5:49pm
Would back that up - you can only really do it with horn loaded cabs (F1 Resolution, Turbo Aspect, TMS, Martin H2/3 etc etc) and even then if you get the placement wrong up it can sound awful.

With reflex cans get one big enough to handle each side. Chances are if you are needing to push more out of a system than you can at the moment and thus are wanting to add more cabinets you should be looking at horn loaded cabs anyway - more efficient, longer 'throw' etc etc and in general will sound a lot nicer too
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boab Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2007 at 11:56pm
I much prefer columns, but here are a couple
look at Arcs
http://www.l-acoustics.com/anglais/produitsgb.htm
Not saying they sound mega, but
http://www.funktion-one.com/f88.htm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote josh Quote  Post ReplyReply Direct Link To This Post Posted: 22 December 2007 at 3:17pm
would you say that an mt122 has a tight enough dispersion to array them?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tallmike Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2007 at 6:31pm
I'm sorry, but Bill's wrong here for one reason - he's assuming you're splaying them tight to each other, which will create comb filtering etc. The cabs need to be angled (or splayed) further apart so as not to interfere with each other.
 
Just like this:
 
Meyer%20CQ-1s%20splayed
 
The only concession is that you will need decently powerful boxes.
And a decent set of ears to fine-tune the angles.
 
-Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2007 at 9:41pm
But thats assuming you have equal dispersion at every frequency, which aint the case

Those cabs look like they are around 30 degree dispersion the way they are setup, if you have a cab thats higher than that, they are going to be pointed to cover such a wide angle that they end up pointing back towards the stage somewhat

You also always end up with a hole in the middle at certain frequencies

Stu




Edited by Disco Stu - 23 December 2007 at 9:47pm
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

My acts:
www.myspace.com/thebowiexperience
www.myspace.com/scheisseelektronisches
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tallmike View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tallmike Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2007 at 9:58pm
Yeah, maybe we should follow bill's example.
 
We'll also build one of his cabs put 35 cheap motorola piezos in a box and call it a 'full range cab' although it has the most horrific frequency response...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2007 at 10:49pm
That doesnt exactly give a succinct answer to the question though does it?

Its fair enough that you can say things that you dont like about piezos, im well aware of their faults and despite that I still use them because I can hear that they do sound better set up properly than some mediocre compression drivers, notice I used the word mediocre.

The fact that he has overextended the range of some of his designs beyond what some people would call acceptable is clear to see as well but everything is a compromise and for what they were designed to do they arent half bad

Anyway with regards to placement, the fact remains that apart from splaying cabs further apart which can itself cause inherant problems if you set them up poorly, bill has come up with a solution that can be realised with a lot less margin for error, although as he says himself, NEITHER method is ideal, vertical stacking with a wider horizontal dispersion cabinet is what he recommends, which in itself has its issues.

Stu

Edited by Disco Stu - 23 December 2007 at 10:51pm
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

My acts:
www.myspace.com/thebowiexperience
www.myspace.com/scheisseelektronisches
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