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w bin cab id/advice

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Peter Jan View Drop Down
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    Posted: 21 October 2020 at 3:17pm
Originally posted by madboffin madboffin wrote:

The Court bins were based on one of the standard designs published by speaker manufacturers in the 60's or 70's - JBL I think. Stephen Court (RIP) originally worked for the UK's JBL importer and his early systems were all built to plans freely provided by JBL, some with his own modifications and improvements.

All the driver manufacturers produced DIY cabinet designs as a way to encourage people to buy their components.



This dual 15 and single 18 W-bin design and spin-offs were published in a lot of loudspeaker build handbooks from Fane, Eminence, etc. in the 80's, 90's, ... On this French site Freeplans.fr, you find this too and I think that came straight out of one of those handbooks. Stage Accompany started with these designs, originally with JBL speakers and later with "their own" design speakers, because they were better ... mmm ... okay ;-). Well, they were good too, not better.
I have drawings somewhere from the mid/late 70's issued by JBL (Donald Keele) with K-151 18" speaker. All with response figures for different port tuning and so on. Don't remember what the 15" were, but probable also some K or E-series like E-140. Plans for 4520/4530/4550/4560 also, but they had different names back than, like n°33 (in that style, I have to look it up to know what it was).


Edited by Peter Jan - 21 October 2020 at 5:20pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote madboffin Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2020 at 2:07pm
The Court bins were based on one of the standard designs published by speaker manufacturers in the 60's or 70's - JBL I think. Stephen Court (RIP) originally worked for the UK's JBL importer and his early systems were all built to plans freely provided by JBL, some with his own modifications and improvements.

All the driver manufacturers produced DIY cabinet designs as a way to encourage people to buy their components.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote AM55 Quote  Post ReplyReply Direct Link To This Post Posted: 20 October 2020 at 10:01pm
Originally posted by Bams Bams wrote:


They were to be found everywhere but ended up in the freetekno/ravescene the last 10 years so travelled a lot.


These pair look like the horn throat has been purple at one point so highly likely they have been part of a sound system too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bams Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2020 at 7:18pm
Over here in the Netherlands Stage accompany is the usual suspect when it comes to these bins. https://www.stageaccompany.com/support/vintage/SA4515-4518.pdf

They were to be found everywhere but ended up in the freetekno/ravescene the last 10 years so travelled a lot. If not court SA would be my second guess. Just like when it comes to jbl4520/30s over here.


Edited by Bams - 19 October 2020 at 7:19pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote APC321 Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2020 at 5:21pm
I reckon that those are earlier versions (Based on handle positions). Not sure if original box or copy.

Shown in early Court brochure:

https://ibb.co/QjFb8nj


In a later Court brochure (the Court logo changed), the handles were in different places, and could also get a version with flying points. Couldn't find any photos with the grills removed:

https://ibb.co/t3XZM3m

https://ibb.co/mRXgcmf

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Post Options Post Options   Thanks (0) Thanks(0)   Quote midas Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2020 at 4:18pm
Did the original ones have the ports over the centre of the back of the drivers?

I had a pair like those above, I also had 4 PAudio es600's. So I tried them, they sounded fine. 
In bass no one can hear you scream!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Aman Gebru Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2020 at 9:01am
I tried many different drivers in Court back box mk2 and the best was RCF L15 554K. And you won't need massively powerful amps to get very high output from them in those cabs.

Looks like you have the mk2 Court black box cabs there. The mk1 had a slanted front, different port arrangement and couldn't use the single nylon grille that came with the mk2's.

After a closer look at the pics, I'm not sure they are real Court bins. I don't remember the bracing going around the front edge and the way the port panel attaches to the cab looks different. The flare rate looks different too. Most of the copies were out the back door cabs, so not really copies at all. They were the real thing, just not sold by Court. Looks like you have a copy, and one that was built not by measuring up a real one.


Edited by Aman Gebru - 19 October 2020 at 9:06am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AM55 Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2020 at 12:28pm
Originally posted by jbl_man jbl_man wrote:



Alternatively,why not just look for a second pair of used RCF's L15 /200's to match the two you already have?


That seems a good solution. I'll keep an eye out. It's not like i'll be getting them out on a gig any time soon.

Originally posted by Peter Jan Peter Jan wrote:


From memory : ports should be 10 cm in diameter and 20 cm long.

Thanks for the tip Peter, I'll look at reinstating them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2020 at 10:57am
I would also look for some RCF L15P200's.
From memory : ports should be 10 cm in diameter and 20 cm long.
I have seen lots of pictures of cabs with just the two holes and in a sense they are ports, but tuned waaay too high.
Good response from around 65Hz with the correct ports, though you can shift a tiny bit around with portlength, depending on the used speakers. Without ports it's rather 75-isch.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2020 at 10:23am
PD 1550 would be ideal, but four of those will be pricey....you would end up with a pair of free w-bins owing you £800.

Alternatively,why not just look for a second pair of used RCF's L15 /200's to match the two you already have?
Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AM55 Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2020 at 8:54am
Thanks for the info.

Any idea of a decent substitute driver?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2020 at 9:36pm
And yes,there was originally 2 ports in that front panel. Original drivers were 2x JBL E140. 
Be seeing you.
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