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JBL 4512 |
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The Builder 
Old Croc 
Joined: 03 January 2010 Status: Offline Points: 3013 |
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 Topic: JBL 4512Posted: 28 April 2010 at 8:15pm |
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Got plans for these but not too good in detail.
Anybody got a pic of the back door off?
Not sure how far back port shelf goes ( to the baffle maybe)?
Thanks
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smithshorn
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Joined: 08 February 2007 Status: Offline Points: 172 |
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Posted: 15 May 2010 at 9:50pm |
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Are you referring to the JBL "4512" horn loaded enclosure that could use either a 12" or 15" speaker? Jbl recycled the number for a later speaker that looks nothing like the horn version.
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bitzo
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Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
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Posted: 16 May 2010 at 8:52am |
To me make sense. In that way port and horn are in phase. Am I right? |
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The Builder
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Posted: 16 May 2010 at 2:48pm |
I have two Rhineo, two ES18, some lips/bullet boxes and redundent Kappa Pro 12's. Box is nice dimensions for the stack..
@ Bitzo, the more I look, the better I get it..
Edited by The Builder - 16 May 2010 at 2:49pm |
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smithshorn
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Posted: 16 May 2010 at 8:07pm |
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If I got you right, the port boards go from the front of the cab to the baffle board. Which plans do you have. I got mine from the Michael Schnittger(?) site before it went down. Thank God for the "Wayback Machine", to try to at least have a chance of retrieving info not available with a Google search anymore, providing you still have the link available.
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The Builder
Old Croc
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Posted: 16 May 2010 at 8:12pm |
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It just is.
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smithshorn
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Posted: 16 May 2010 at 8:19pm |
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No Plans! BUT great info on these if you don't already have this.http://www.stageaccompany.com/vintage/docs/Sa4512.pdf
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The Builder
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Posted: 16 May 2010 at 8:26pm |
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Got that thanks.
French site good enough, seem like a good old cab!
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smithshorn
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Posted: 16 May 2010 at 8:32pm |
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Those are the same plans I built mine off of. GREAT cabs, I thought, and so did the crowd.
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The Builder
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Posted: 16 May 2010 at 8:49pm |
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It just is.
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rob.parkinson
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Joined: 25 June 2011 Location: Manchester UK Status: Offline Points: 3 |
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Posted: 11 June 2012 at 6:18am |
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Hello all. I know its been a while but id like to restart this thread if I may. Looking around on the net i have seen several images of the 4512 (3D models, photos, etc), some with a port extending to the baffle and other where the port base follows the line of the horn ( http://www.vandesteenoven.nl//s/4512.jpg - http://www.vandesteenoven.nl/html/images/4512.jpg ). This is, I think, probably due to the rather sketchy plan available on
hornplans.free.fr/4512.html .
Now I reckon we can make the educated assumption that it is the designers intention that the ports stretch back to the baffle, but this is not the only question left unanswered by this plan.
I'm looking to build a couple of these and the thing I want to know is, should the portions of the speaker not directly in the horn throat be blocked off by the baffle? In other words, should the baffle cut-out be a full circle or cropped to match the horn throat? Any ideas??? |
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smithshorn
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Posted: 11 June 2012 at 7:20pm |
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When I built mine I built them with the baffle hole round. Somewhere I have photos of the 4512's with the drivers removed and the holes were round, same as the altec a7's. When using 15's in the 4512 I added an extra gasket.
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The Builder wrote: