Help with 4315

[Akira]

I just had a Bryston 4B go DC on me 20 minutes ago and it took out the woofer of one of my 4315's. I think the other 3 drivers are OK.
So here's my questions:
1) As the badge is missing off the 12" what is the model number of the 4315B bass driver (non alnico)
2) Can you still get original parts, if not is it possible to save the cone which is in perfect condition and just replace the coil/spyder assembly?
3) Does the above condition damage the cross/over section?

I could test everything out with the remaining good side of the Bryston but, that might be acting stupid twice! Right now I want to throw it in the gargage.

[4313B]

Just build new boxes and use LE14H-3's instead. They are better anyway. Four cubic footers tuned to 30 Hz.

That leaves the foam surround on the 112/2108 as the weakest link.

The 2203H / 124H recone kit is N.L.A.

You could also try 128H-1's in them. The 4315 volume is larger than an L112 or 120Ti and smaller than an L150/L150A.

Or guys like Gordon W could probably cook you up some drivers from parts.

[Robh3606]

That sucks

He's right just go for the new drivers. The originals were 2203's/124 which are no longer supported.

Rob

[BMWCCA]

(Is it my imagination or are posts disappearing from this thread? What is it about folks who make a comment and don't want it preserved for posterity? Are they unsure of themselves? Too good for the rest? Odd behavior seen quite often here and I'm a bit mystified.)

I was going to comment on the 128H-1 suggestion by asking if the LE120H-1 might help, though the mounting shape is a bit odd. Seems these are often sold from parted-out L7 systems and I've heard others suggest this might be a memorable 12". Would that re-cone kit (C8RLE120-1) perhaps fit? Or is it, too, NLA? Just a thought. Sorry for your predicament.

[John]

Just build new boxes and use LE14H-3's instead. They are better anyway. Four cubic footers tuned to 30 Hz.

That leaves the foam surround on the 112/2108 as the weakest link.

The 2203H / 124H recone kit is N.L.A.

You could also try 128H-1's in them. The 4315 volume is larger than an L112 or 120Ti and smaller than an L150/L150A.

Or guys like Gordon W could probably cook you up some drivers from parts.

What about a 121A kit ? Or for some real fun What about a 2235 coil mated to that cone in the 2203??? Just putting it out there, have no real knowledge if any of this can or will work.

[4313B]

The 121, 124, 2203, 136, and 2231 all use the same coil. The spider of the 121 is too stiff though.

The 4315 was always one of my favorite systems. It's too bad most of the kits are no longer available for it. The only driver still servicable is the 077/2405. I would imagine fully functional examples of the 4315 will probably start commanding higher prices.


This type of accident is a real bummer.
Very scary with legacy loudspeakers.

[Akira]

So is it possible to save the cone and rebuild it with a different coil/spyder assembly?

[Earl K]

So is it possible to save the cone and rebuild it with a different coil/spyder assembly?

- Anything is possible with enough knowledge, care & time spent . The limiting factor is always money .
- Across North America there are only a handfull of reconers who I would trust with the task of a "rescue & rebuild" / and none of them are in this area . An individual previously mentioned ( Gordon Waters ) , is one I would trust with the task .

- Call up any local reconer that you can think of ( in the Toronto area ) and ask if they have the means ( & know-how ) to match the BL , MMS , Xmax & other large-signal TS parameters and you'll just get a lot of waffling on the subject .


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ps ; too bad about that 4B , was it the original series 4B ? ( or the ST or SST )

- I too like the idea of using le14s as an upgrade .

[Akira]

Yeah it was an original 4B (20+ years old) Still think it is a good amp and thinking of having it rebuilt.

I may have a lead on an after market 2203 assembly. What is the difference between 2203, 2203A, 2203H

Also, hoping another forum member will sell me his remaining
pair of 2203H's. In a perfect world I'll take all three! But, right now I have a serious problem.
I do NOT want to embark on a speaker project and I just have to get these otherwise perfect 4315's back.

btw: Do you know Bob Santon? He has been the only serious PRO JBL reconer in Toronto for 40+ years.
He has done all of my work for 30 years when I had a sound company with over 60 multiway enclosures.
He also used to remag my drivers for $5.

[4313B]

So is it possible to save the cone and rebuild it with a different coil/spyder assembly?

It would probably be better to buy a 121 kit and then have someone like Gordon put the 124/2203 type spider on it. The 121, 124, and 2203 all use the same cone and surround, as well as coil. Send a PM to Gordon and ask him what he can, or will, do.

The 128H-1 would require network modification because that system isn't bi-ampable out of the shipping carton.

Oh, if I remember correctly the LE14H used the same coil too.


A is AlNiCo V and H is SFG ferrite.

Also, hoping another forum member will sell me his remaining
pair of 2203H's. In a perfect world I'll take all three!

That'd be great. At one point we actually had spares of those systems sitting around on shelves but over time they all went into use.

[Earl K]

btw: Do you know Bob Santon? He has been the only serious PRO JBL reconer in Toronto for 40+ years.
He has done all of my work for 30 years when I had a sound company with over 60 multiway enclosures.
He also used to remag my drivers for $5.

- Since you know Bob , ask him to make up for you a 2203H equivalent recone-kit ( one which, duplicates JBLs' published TS parameters ) .

- Then buy yourself WooferTester III ( from Parts Express ) to check the execution of his handiwork ( or for that matter, anyone elses custom work ) .






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[Robh3606]

It would probably be better to buy a 121 kit and then have someone like Gordon put the 124/2203 type spider on it.

What about mass ring?? Can you cut the 121's down??

Rob

[4313B]

No, you can't really cut it down, just use the 124/2203/136/2231/2235 mass ring instead. They are available separately. Or they used to be anyway. I have a ton of them if not. The 121 used the "100 gram" mass ring which is 95 grams and the 124/2203/136/2231/2235 used the "50 gram" mass ring which is 35 grams.

I'm actually aquaplasing a pair of 2235H kits right now instead of using mass rings because a certain someone needs the extra Xmech. The 128H-1, LE14H and 2245H used aquaplas instead of the mass ring.

[Earl K]

Hi Akira

The following info is courtesy of Giskard ( & found in the "Transducer" section ) .

- You'll want to have any transducer rebuilder, match the replacement voice-coil to these original JBL specs .
- ( Look up the rest of the 2203H TS specs so that you can advise your designated rebuilder, what you expect him to match to )



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[johnaec]

Is this worth checking out, or is that the wrong size foam? http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=013

John