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Author Topic: JBL 2360 Horn Placement Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 01-29-2011 11:05 PM                     I just acquired some 2360 horns to mount on our 4648's and need to find out what is the proper placement of the bracket. This combination essentially makes a 4675A system. I found this diagram on JBL's site, but it doesn't show the bolt hole location specs. Judging by drawing, they look to be centered.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-30-2011 09:40 AM                        That is about right. See if there is a drawing for the 4648a, l.f. part of the 4675 that shows the dimensions of the top. Later models had nut-serts permanently installed. It won't matter much if you are bi-amped and the crossover has time delay. Louis  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 01-30-2011 04:13 PM                     Thanks Louis. I've looked at every drawing of the different versions of the 4675 and the related components that I could find and none have the bolt location specs. In particular though, the bracket these 2360's came with the wooden version. They will be on a 3160 network.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-31-2011 09:12 AM                        Wooden bracket is most commonly installed flush with the front using the passive crossover. yes, the horn is quite far "in front." In the old days, we used a "warble tone" (500hz with frequency modulation) to find the NULL, with the hf wiring reversed. then put back to normal. You will be time aligned at 500 hz. louis  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 02-13-2011 08:33 PM                     I have a screen that has 2 4648-8 (2 15" 16ohm 2225 drivers paralleled) and 1 4648 (2 15" 8ohm 2225 drivers paralleled) that I am mounting 2360A horns (2445J drivers) with the 3160 passive x-overs. What is the proper x-over configuration for these?  |  IP: Logged Lionel Fouillen Expert Film Handler Posts: 230 From: Belgium Registered: Nov 2002 posted 02-14-2011 01:53 AM                     This document from the JBL vintage website features "Recommended system settings" for the 3160 crossover with a 4675A speaker. 3105-3115A.pdf  |  IP: Logged Joshua Waaland Jedi Master Film Handler Posts: 800 From: Cleveland, Ohio Registered: Dec 1999 posted 02-14-2011 09:14 AM                     I have another new 2360 horn, three 3160 crossovers and three of the 2506B steel horn mounting brackets for sale if interested. I had the wooden brackets too and switched to the steel brackets. I had the original 4508 cabinets and they did not have the threaded inserts in them. The newer 4508A cabinets did so I switched to them.  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 02-14-2011 11:19 AM                     I see on the specs chart for the 3160 that it only specifies 4 ohm low frequency. Is it not compatible with the 8 ohm cabinets?  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 03-02-2011 05:37 PM                     I've been asked if a matching transformer will work to make the 4648-8's into 4648's (4 ohm version) so that the 3160 x-over will have the required 4 ohm load for the low frequency. If so, what would be a recommended transformer?  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 03-02-2011 07:07 PM                        Don't bother. It will work OK with only that small mismatch. The quality loss in the transformer is the greater of the two evils. Louis  |  IP: Logged

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