Crossover of 4343

[audiophile.1963]

Hi, I'm writing from Italy and I'm looking for a pair of crossover of the JBL 4343, someone can help me?
or someone know shops of vintage JBL in USA?
Thanks for all and good day
Giuseppe

[audiophile.1963]

The crossovers are for this set of speakers: woofer 2231h, mid bass 2118h, mid high 2105h and tweeter 2403. Is there someone who can help me?
Giuseppe

[FE3T]

I have seen the xovers go for 1000$ a pair on Ebay, so maybe it would be better to build them yourself?

[Odd]

The crossovers are for this set of speakers: woofer 2231h, mid bass 2118h, mid high 2105h and tweeter 2403. Is there someone who can help me?
Giuseppe

The crossover for 4343 will not be good for your selected speaker elements.
STUDIO MONITOR REFERENCE CHART. (http://www.jblproservice.com/pdf/Systems%20Reference%20Charts/Studio%20Monitor%20Series.pdf)

If you want a crossover for the selected items, you must have help from a pro. With the right tools.

[Earl K]

LHF member Guido ( in Germany ), is a pro .

He could make you up a set of stock 4315 crossovers ( which in their stock form ought to be quite close at working ) .
Of course, you could also wait for a set of 4315 crossovers to appear on eBay ( or from another member ) .

If you want a design thats better / then ship a set of your components to him so that he can fine tune the basic 4315 topology .

<. EarlK

[audiophile.1963]

LHF member Guido ( in Germany ), is a pro .

He can make you up a set of stock 4315 crossovers ( which in their stock form will be quite close at working ) . Of course ,you can also wait for a set of 4315 crossovers to appear on eBay ( or from another member ) .

If you want a bit better design /then ship a set of those components to him so that he can fine tune the basic 4315 topology .

<. EarlK

Do you think that the right crossover is the 3114A mounted in 4315? How I can find Guido? How much cost a pair of these crossovers?
Regards
Giuseppe

[speakerdave]

Do you think that the right crossover is the 3114A mounted in 4315? How I can find Guido? How much cost a pair of these crossovers?
Regards
Giuseppe

Reread all the above responses. It seems you are not getting what you are being told.

What needs to be said more explicitly is that you have a random set of components. There is no crossover in existence that will unite them into a system anyone would want to listen to for very long. Crossovers are designed for a specific set of components in a certain cabinet. Earl's idea about adapting the 3114A may work, but the crossovers are very rare and it will take some expert (expensive) help to make them useable for your set of components. Besides, they should be preserved for people trying to rebuild or clone the 4315. The schematic of the 3114A could be a guide for someone who can design for the differences of frequency response and sensitivity of the 2108 and the 2118. I couldn't do it, myself.

Building speakers is like tearing down and rebuilding an engine in that males tend to think they can do it just because they are willing. It is true in neither case without a lot of expert assistance on location with the parts and the necessary tools and TEST EQUIPMENT. Better to copy a specific design for which you know all of the components are available and a crossover schematic is available and all the parts needed for that are available (this last is not true of the 3114A, by the way). Your proposed project does not meet these criterion, and if you pursue it, will very likely mean a series of headaches and disappointment in the end. The JBL speakers that meet those criterion are discussed frequently in these forums. Several weeks of reading and asking questions will get you the background you need to undertake a JBL speaker building project. Right now, it's a non-starter.


Do you think that the right crossover is the 3114A mounted in 4315? . . . . .

No.


. . . . How I can find Guido? . . . .

He's a member here. Send him a PM.


. . . . How much cost a pair of these crossovers? . . . .

No longer in production, so cost is hard to predict, since you will no doubt find them nowhere but ebay--and when is a huge question. Be ready to spend some money.

[speakerdave]

Actually, second thought, you might consider looking into the L220.

[hjames]

If you want to build a pair of 4343, you will need to sell some of your drivers and get the right ones that were actually used in the 4343 systems. Putting a mixed set of drivers with a 3143 crossover will not work correctly.

[audiophile.1963]

...and if I should find a set of 3115a + 3120a + 3105a?

[speakerdave]

...and if I should find a set of 3115a + 3120a + 3105a?

You would have some crossovers. Try to find a pair of crossovers for the L220. You cannot build them because they use a tapped inductor that is not available. They show up on ebay sometimes because people tear the speaker apart for the cat's eye tweeter, which you already have. You could try the 2231 in the LE14a position; it might work.

[speakerdave]

There's a pair of those crossovers on ebay right now.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170665171891&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en#ht_2087wt_1010

[audiophile.1963]

You would have some crossovers. Try to find a pair of crossovers for the L220. You cannot build them because they use a tapped inductor that is not available. They show up on ebay sometimes because people tear the speaker apart for the cat's eye tweeter, which you already have. You could try the 2231 in the LE14a position; it might work.

Thank you very much for your reply
But I have four loudspeakers and the cabinet is builted for these set: there is the JBL 2118h between 2231h and 2105h used like a mid bass
Regards
Giuseppe

[speakerdave]

Thank you very much for your reply
But I have four loudspeakers and the cabinet is builted for these set: there is the JBL 2118h between 2231h and 2105h used like a mid bass
Regards
Giuseppe

Well, I have no further suggestions.

[Guido]

To add even more confusion:

Find a pair of 2122 or 2123
Find a pair of 2425 or 2426 with 2307 horns
Build or have build nice cc 4344 crossovers.................

and go the 4344 route.

You won't be dissapointed.

Well we are talkin about a bunch of money here but see yourself:

http://www.audioheritage.org/vbulletin/showthread.php?30514

[hjames]

Thank you very much for your reply
But I have four loudspeakers and the cabinet is builted for these set: there is the JBL 2118h between 2231h and 2105h used like a mid bass
Regards
Giuseppe

Ok, so take photos of these cabinets that you already have and show us what you've got ...

You were the one that started this thread and said you wanted crossover of 4343 - if that is what you want, you need to use the right drivers if you want them to play well together.

[audiophile.1963]

The cabinets are builted with walnut strips 4 cm, they simply amazing, the dimensions are:
132 cm high
60 cm large
45 cm deep
the volumes of the loudspeakers are:
woofer 2231h 80 lt with 4 holes diameter 7,5 cm long 30,5 cm
mid bass 2118h 10 lt
mid high 2105h 3 lt

http://imageshack.us/photo/my-images/402/crossoverke.jpg/
http://imageshack.us/photo/my-images/839/jbll250.jpg/
Thanks for all
Giuseppe

[Earl K]

http://img839.imageshack.us/img839/6391/jbll250.jpg

Nice looking cabinets Giuseppe !

http://img402.imageshack.us/img402/2641/crossoverke.jpg

How does the existing crossover disappoint you ?

ie ; Why do you want a new crossover ?

<> EarlK

[audiophile.1963]

http://img839.imageshack.us/img839/6391/jbll250.jpg

Nice looking cabinets Giuseppe !

http://img402.imageshack.us/img402/2641/crossoverke.jpg

How does the existing crossover disappoint you ?

ie ; Why do you want a new crossover ?

<> EarlK


The crossovers are a disaster! The picture does not rapresent really the status: the components are different between the two crossovers and they are nailed with caos. If you could see and listen my loudspeakers you could understand my choice.
Giuseppe

[grumpy]

a full-on custom crossover does seem warranted with the stated components, although
the box volume does seem to be on the small side for the 2231A. As it is, I would expect
a fairly 'tight' sounding bass with limited low end, possibly assisted by moving the cabinets
toward a wall or corner. If that area is not a problem for you or suits your listening
preferences, then you could start moving up the driver chain and make decisions about
what crossover topologies might suit this mish-mash of components.

That cat-eye tweeter does look nice in the 044 hole.

[Earl K]

a full-on custom crossover does seem warranted with the stated components, although
the box volume does seem to be on the small side for the 2231A. As it is, I would expect
a fairly 'tight' sounding bass with limited low end, possibly assisted by moving the cabinets
toward a wall or corner. If that area is not a problem for you or suits your listening
preferences, then you could start moving up the driver chain and make decisions about
what crossover topologies might suit this mish-mash of components.

That cat-eye tweeter does look nice in the 044 hole.

Here's the schematic for Giuseppes' current network ( a "failed" , "full-on custom crossover " ) .

FYI, this was posted in an older "Help Me" thread called Help for ( the ) right volume ( for the ) 2231H . (http://www.audioheritage.org/vbulletin/showthread.php?27675-Help-for-right-volume-2231H&p=279118&highlight=#post279118)

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=44237&stc=1&d=1265652999



Hi,

I have this set of loudspeakers: woofer 2231h, mid bass 2118h, mid high 2105h and 2403h tweeter. A 3143 or 3144 crossover should be ok with this set? Or there is someone who can help me in this "enterprise"?
Thanks
Giuseppe



That's a custom driver load.
The only way to do it is in box measurements transfered into LEAP or another suitable program. None of the generic crossovers will work right out of the box. The closest would be the crossover used in the 4315.


http://www.lansingheritage.org/html/.../1977-4315.htm (http://www.lansingheritage.org/html/jbl/specs/pro-speakers/1977-4315.htm)

Rob:)


A Summary ( of sorts ) :

- One point is that a lot of this is previously traveled territory ( advice wise ) .
- One constant is Giuseppes' dissatisfaction with the status quo ( & his continuing idea that the stock 3143 is a suitable substitute, which it is not ) .

- Giuseppe now needs to decide whether or not to hire someone for another custom network ( keeping in mind that the first one didn't work out to his satisfaction ) or buy something "off-the-shelf" such as the 4315 network ( which BTW, has Zobels on both the woofer & mid-bass sections that will help somewhat "force" the different transducers to play nicer with the stock LCs ) .

- Guido doesn't seem interested in designing a network for this custom one-off ( which is unfortunate ) .

<> EarlK

[audiophile.1963]

This moorning I contacted my laboratory of hi fi service repair and probably they will help me in this enterprise. The measurements have done these frequency cuts: 400Hz, 1200Hz and 5000KHz. There will be the problem of the phase rotations... I will inform you about news
Ciao
Giuseppe

[grumpy]

Sorry, I had forgotten about the previous query.

I hope your local hi-fi lab is as enthusiastic about your project
as you are :) A custom 4-way is quite a challenge!

[audiophile.1963]

Sorry, I had forgotten about the previous query.

I hope your local hi-fi lab is as enthusiastic about your project
as you are :) A custom 4-way is quite a challenge!

I have another fear... the volume of bass too small, It should be a grat problem to resolve!
I will inform
Thanks for all
Giuseppe

[speakerdave]

You could have an adapter plate made and use a 14" woofer, preferably the LE14-1 or -3, or even the 1400nd if you can find them, but even the LE14A would do. Any one of them will work in that space. The LE14A is ubiquitous over here and not very expensive these days. The others are rare and rarer.

And then maybe you could track down the midbass driver for the L250. You should biamp at the woofer/midbass handoff.

[speakerdave]

. . . . That cat-eye tweeter does look nice in the 044 hole.

Yeah--it's a nice touch.

[Robh3606]

And then maybe you could track down the mid-bass driver for the L250. You should bi-amp at the woofer/mid-bass hand-off.

Yes good idea but not without some work. Really need to sim it with the active crossover curve and the voltage drive on the mid-bass, 108H needs the network tweaked. It's another custom job unless he goes passive.

Rob:)