w bin cab id/advice |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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Posted: 21 October 2020 at 3:17pm |
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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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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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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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AM55
Old Croc Joined: 16 August 2007 Location: Matlock Status: Offline Points: 1728 |
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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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Bams
Young Croc Joined: 08 April 2009 Status: Offline Points: 622 |
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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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APC321
Young Croc Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 680 |
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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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midas
Old Croc Joined: 27 October 2011 Location: Cumbria Status: Offline Points: 2117 |
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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.
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In bass no one can hear you scream!
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Aman Gebru
Registered User Joined: 01 February 2014 Location: Delhi Status: Offline Points: 350 |
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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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AM55
Old Croc Joined: 16 August 2007 Location: Matlock Status: Offline Points: 1728 |
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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.
Thanks for the tip Peter, I'll look at reinstating them.
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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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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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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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? |
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Be seeing you.
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AM55
Old Croc Joined: 16 August 2007 Location: Matlock Status: Offline Points: 1728 |
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Thanks for the info. Any idea of a decent substitute driver?
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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And yes,there was originally 2 ports in that front panel. Original drivers were 2x JBL E140.
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Be seeing you.
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