Loudspeaker coverage / dispersion |
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rupture
Registered User Joined: 15 August 2005 Status: Offline Points: 25 |
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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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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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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 |
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Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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josh
Registered User Joined: 03 December 2006 Status: Offline Points: 682 |
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Very interesting....what would you class as a tight enough dispersion to allow you to array cabinets
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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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 |
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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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SteveAATW
Young Croc Joined: 04 September 2007 Status: Offline Points: 1173 |
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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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boab
Registered User Joined: 21 June 2004 Location: Busby Status: Offline Points: 484 |
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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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josh
Registered User Joined: 03 December 2006 Status: Offline Points: 682 |
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would you say that an mt122 has a tight enough dispersion to array them?
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tallmike
Old Croc Joined: 18 September 2007 Status: Offline Points: 2684 |
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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:
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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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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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 |
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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
Old Croc Joined: 18 September 2007 Status: Offline Points: 2684 |
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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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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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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 |
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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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