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Anyone one seen these before?

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dlyxover View Drop Down
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    Posted: 21 July 2017 at 12:22pm
Anyone seen these before?

In the Truth there is no news, and in the News there is no truth
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madboffin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote madboffin Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2017 at 9:04pm
It looks a lot like a JBL 4660. The original "differential dispersion horn" design, later adopted by various other manufacturers.
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_djk_ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2017 at 9:43pm
I own a pair (in black).

Horn also used in the original Everest.



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dylan-penguinmedia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dylan-penguinmedia Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2017 at 10:33pm
^^ Holy shit look at those bad boys!
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all bass View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote all bass Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2017 at 8:50am
Originally posted by _djk_ _djk_ wrote:

I own a pair (in black).

Horn also used in the original Everest.





Drool...
https://www.instagram.com/my_modular_journey/
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2017 at 1:30pm
Biblically expensive when new...and still worth fortunes today.


Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2017 at 3:41pm
Darth Vader's home hifi.
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_djk_ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2017 at 8:52pm
The woofer is a 150-4H, a variant of the E145 (underhung coil), 077 (2405) tweeter, and a 2426 compression driver on that wild horn.

Some have been able to upgrade the mid horn to a 1.5" throat, allowing the use of a Be driver (2435).

I bought four E145 woofers and was thinking of making a right-angle plenum and mounting the drivers push-pull (for lowest distortion).

One of my donor 4660 horns came out of a church install where it had fallen (fortunately not killing anyone). The 4660 usually had the 2225 woofer.


Edited by _djk_ - 22 July 2017 at 9:00pm
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JonB67 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB67 Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2017 at 11:12pm
whats the advantage of the asymmetric horn? Presumably better distribution in which case why arent they more common?
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matty w View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty w Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2017 at 3:37am
So how good do they sound ? What's the verdict djk ??
Black to black , red to red , blue to bits ....

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tv00 Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2017 at 9:20am
Whow I get seasick from that top picture, could you please turn it :-)
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madboffin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote madboffin Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2017 at 8:04pm
Originally posted by JonB67 JonB67 wrote:

whats the advantage of the asymmetric horn? Presumably better distribution in which case why arent they more common?


If you look carefully at one of these horns you will see that at one end, it looks like a short, wide dispersion horn. Whilst at the other end, it looks like a long, narrow dispersion horn. The profile gradually changes from one to the other.

The 4660 was originally developed to give even coverage of a room from a position on the ceiling near the front wall. The wide angle end of the horn is aimed downwards at the front rows of seats and the coverage gradually gets narrower as you go further back in the the room, keeping the sound level reasonably constant at floor level. It was very innovative at the time and I'm sure JBL wrote a technical paper with a full description, try a Google search for it.

A few other manufacturers have used the same technique. The first was probably Martin Audio in the early 1990's with the LE700 wedge monitor. In that system the wide coverage was at the top, for a musician very close to the the monitor, and the narrow coverage at the bottom. The result is that as you go further upstage (away from the wedge) the HF level doesn't change very much and the horizontal coverage remains fairly narrow so the monitor covers a well defined section of the stage. EAW were also an early adopter with some of their installation products.

Martin still make extensive use of these horn designs and it's one reason why the DD6 is such a useful box for Speaker On Stick, Frontfill, and Mini Wedge applications. You can turn the horn round, without the use of tools, depending on how the speaker is to be used.


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