Horn dispersion arraying REALLY matter? HELP! |
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Lincoln1
Registered User Joined: 16 February 2009 Status: Offline Points: 251 |
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Posted: 30 March 2010 at 12:11am |
In seeing various pics on the net (including here) I have noticed that when stacking 2,3,4... a side midtop bins that they seem to appear to not stick to any proper 'strict' angle ratio between them. Now I know all HF horns have different dispersions but even then if more are used the angle between each one gets less just to direct the bulk of the sound in the general direction required. I have heard this not work so well with a 'phasey' HF thing going on, but do most people give a toss?
Reason is I have bought 4 x 2426 1" jbl comp drivers for an 'X15' project. Have another 2 or 4 N481K RCF 1" drivers which have a similar response and power handling to the JBL's. I have some 60x40 horns for them all but want to know when I need more power can I just put 4 boxes a side with minimum degrees between them? But when using 2 a side go for correct dispersion angle?
Just to make things more complicated I have been offered some JBL 2370a biradial horns which will remove much of the HF boost required for my 60x40 horns. However they are a 90x40 dispersion, meaning THEORETICALLY I can't array them in narrow'ish controlled angles making matters worse (IN THEORY). I know that 90DEG horiz isnt a given and will require listening to determine a the degrees to array them at.
Any help on this area would be awesome, as I really would like the flexibilty to use from 1 midtop a side to 4 a side. If you made it this far thru my postCheers:)
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Centauri
Old Croc Joined: 29 November 2004 Location: Newcastle Aus Status: Offline Points: 1792 |
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When you need 4 boxes per side, stack the additional two upside down on top, and keep the correct angles.
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Lincoln1
Registered User Joined: 16 February 2009 Status: Offline Points: 251 |
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Wont be as pretty but will work, cheers. What about if I opt for the original jbl biradial horn with it's 90 deg dispersion...does this mean I can't put anymore than 2 per side, 1 on top of the other? (Else the coverage angle would be too great I'm guessing with 90 deg disp horns).
The JBL biradial would maybe be better since they need less HF boost and from what i have read lately some horns can increase cone breakup, and possibly piling on the usual EQ surely wont help either.
Sorry about 2 questions at once...just saving posts:)
Thanks for the help so far.
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nex_audio
Registered User Joined: 29 March 2010 Status: Offline Points: 19 |
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90 degree horns are designed for small format sound with only 1 speaker per side. You wouldn't really want more than than otherwise it will spill onto stage and cause all sorts of problems. That is why manufacturers spend £1000s designing narrow dispersion speakers. The only people that don't give a toss about it sounding 'phasey' are the ones that don't really know how to set it up properly, or just want it loud rather than quality. |
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NEX Audio - Hire & Sales
www.nexaudio.co.uk |
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VPAS
Registered User Joined: 05 December 2005 Status: Offline Points: 1203 |
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Some cabs array alot better then others...
Heres a balloon render for 2 Martin F12's. And heres 2 Res2s These are at 1KHz, cant remember the splay angles but they were the best i could find. |
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n^2 modulo -P = number wang
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FarmerWardy
Young Croc Joined: 05 April 2004 Location: United Kingdom Status: Offline Points: 647 |
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thats pretty cool, you can blatantly make out the spikes and dips on the martin image, where as the fk1 looks to be more rounded and covers more evenly.
wikkid stuff, kinda makes me wonder if those images are a real representation tho or its just over complicating/working something that is really much simpler......i dunno. |
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UnKnOwN Soundsystem
Void, Turbosound, Thunderridge Bristol, UK |
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rich, ind.st
Young Croc Joined: 14 January 2005 Location: United Kingdom Status: Offline Points: 1096 |
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the funktion image would be interesting from the same angle as the martin plot
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music is god
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VPAS
Registered User Joined: 05 December 2005 Status: Offline Points: 1203 |
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Il sort a screen shot of the res2's from the same angle, it is as smooth as it looks!... Anyone want to see any other cabs? Give me model numbers and splay angles and il stick them in. Most manufacturers have EASE data for their speakers, dont think void do though... |
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n^2 modulo -P = number wang
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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Smooooth...
how would one go about compiling EASE data for a particular horn? They look very useful indeed. |
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Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk Speaker Building Services |
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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to reply to myself...
http://www.auralisation.de/dir_dnl/speakerformats404.zip |
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Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk Speaker Building Services |
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burningbush
Old Croc Joined: 25 May 2009 Location: Pictland Status: Offline Points: 5897 |
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So, if you want more than one horn a side, then you should use narrow dispersion horns. Try a different horn, like a obvate spheroid as opposed to the square, angular types. If you have it so can rotate horn, then can adapt very easy to adding more.
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music is the message
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Lincoln1
Registered User Joined: 16 February 2009 Status: Offline Points: 251 |
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That's true burningbush, I thought that much. I am guess an obvate speroid is the rounded versions of the std horn? (bit of a newie here) I cant see this helping to do both jobs well either due to spilling over if disp is too wide. Do you mean will help with less cone breakup? or they dont require HF compensation?
I also have 4 spare big grunty JBL 2446's (2" throat 100-150W) which I could maybe fit a pair each to single large horns in a separate box and not power the horns in the mid-top boxes when I need more power. This way it'll be a point source of known dispersion.
Those ballon graphs look interesting. I'm guessing you'd need one for each frequency though...(as he goes back to confirm this is the case)
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