4340 & 4341 references thread

[hjames]

This thread is an index to various other threads and references on the early JBL 4-way monitors.
The 4340 was design to be biAmped.
The 4341 had a conventional crossover.
These monitors were built for roughly 2 years (1973-75) and were followed (1976) by the larger and now better known 4343 and later the 4345 monitor (18" woofers).

(Below photo credits: upper 2 pix courtesy of Anthony L100 and lower 2 pix courtesy of Riessen)


This is designed to be a longer term references to other resources here and outside on the web.

I'm trying very hard to keep the thread "on topic" so please give me the next few days before posting ANY replies or comments here.
Your PMs are most welcome.

[script56]

Can we reference some grille frame dimensions for the 4341? I need dimensions and hopefully someone has some pictures of grilles that show their construction. Also blue grille cloth for walnut cabs and black cloth for gray, right?

[koshan]

hi every one
I have paire of altec 9849. and I want completely rebuild the crossover. where should I contact. or which frum should discuss.
thank for answering

[hjames]

hi every one
I have paire of altec 9849. and I want completely rebuild the crossover. where should I contact. or which frum should discuss.
thank for answering

Not this one -
you are COMPLETELY off topic in a JBL Studio Monitor thread ...
Look a little more ...

[hjames]

In a previous thread, Giskard posted this information -

The 4340 is the bi-amp only predecessor to the 4343.
The 4341 is the passive only predecessor to the 4343.

The oldest Pro price list I have only goes back to April of 1977 -
http://audioheritage.csdco.com/vbull...tor+price+list

Thanks, Giskard!
Here is a Link to 1974 4340/4341 brochure in Library section of this website

The drivers specified for the model 4340 & 4341 are listed in the graphic excerpt posted below (chart posted courtesy of JBL)
Note that the Model 4343 (see brochure) which replaced the 4340/41 used the same drivers and a somewhat larger cabinet.


3140 - crossover used in 4340 (biamp config)
3141 - crossover used in 4341

3143 - crossover used in 4343
3145 - crossover used in 4345 (final version of the 4 way crossover used in this series)

Here's a picture of the 3141 crossover in a 4341 - its bolted the bottom just behind the woofer and is normally covered with soundproofing material
The grey cable runs up to the L-pad assembly, and the paired lines go to the individual drivers and the rear terminal panel.

Below this is page 3 from the JBL Professional Studio Monitor reference chart listing the components of various monitors.

[hjames]

Examples of some immaculate restoration

Anthony L100 has a very clean original set in the UK - http://audioheritage.org/vbulletin/s...highlight=4341(images midthread)

Riessen's 1st 4341 system - 8/05 - 01/06 - 4341 Back to Life (white cones and all!)

Riessen's 4341s - more pix (Feb 2006) - http://audioheritage.org/vbulletin/s...highlight=4341

[hjames]

Some recent sales of 4341 monitors

LHS Forum Ad - May 07 - Long Branch, NJ - s/n 10083 and 10105
surrounds gone on 15"s and 10", 1 grill damaged, scratches

Ebay #290105113709 - May 07 - Columbia, PA - (no bids) s/n 10009 and no s/n
wrong 15s and 10s (2234s and 2123s), bad lPad on 2405. no grilles, cabinets very very good.

Ebay #250089231148 - Mar 07 - Philadelphia, PA - sold for $2400
All correct drivers - appear good, have grills, bad surrounds on 15s

LHS Forum Ad - Jan 07 - Detroit, MI
Look to be very clean and complete, and had the rare white coned 15" woofer.

Ebay #320047984198 - Nov 06 - Tucson, AZ - sold for $1500.
The pictures are now gone. The original ad read:
"This pair of Monitors are huge and must be picked up or trucking arranged by buyer. They are sold as is, but I will describe them honestly.The speakers need to be re-coned. The higher frequency components are perfect. Even in this condition they sound Incredible. The cabinets are rough in the back but fair in front. Some chips in the wood I posted a lot of photos if you need more ask.Don't forget the Buy It Now option disappears after the first bid !!!Just the JBL 2405 Ultra HF Slot Tweeters are worth $400.00 These are extremely rare and have been considered among the finest Monitors ever built. Drivers with pure silver impedance controlling rings etc. etc. A very rare opportunity."


Ebay #9721369094 - May 06 - Emigrant Gap, CA, s/n 11521 & 11557
Sold for $1750 - pictures now gone. The original ad read:
"a good working pair of studio monitors ,They contain the following components 2405 slot tweeter ,2420 driver with horns and lens,2121 10 inch mid-range speaker lans-a-loy surrounds need replacing soon hard but not cracked. ,2225h woofer .SERIAL NUMBERS ARE 11521 AND 11557.Cabinets could use some restoration ,no major damage, plant spot on one top ring but not raised very repairable .Shipping weight is 390 pounds each speakers 175 pounds each .Grills are missing .Grill can be bought at the speakers works in tulsa ok. Dave makes great grills.WILL SHIP OVERSEAS FOR $500.00 INCLUDES GREAT PACKING JOB AND DELIVERY TO PORT . I USE SHIPPING INTERNATIONAL AND NNR They sound better than any altec lansing ,all they need is grills and 2231a's to be correct ! New foam on the 10 inches and they are killer control monitors ,great for mixing ...TRUE SOUND REPRODUCTION!"

[hjames]

March 2007 - ebay 4341 sale: Philly

[hjames]

April 2007 - ebay 4341 sale: York, PA

After watching the previous pair sell in Philly, I was amazed to see another pair pop up near York PA just a few weeks later. In the ad, the seller said the original woofers had been changed out for a pair of 2234s, and the 2121 10" Midbass drivers had been changed out for a pair of 2123s. Something was wrong with the crossovers (or lPads of 2405s - buyer beware), one of the foilcals was gone, there were no grills or lenses, and it was stated that they had scratches etc.
But with all the listed flaws the starting price was $2000, which seemed high to me.
I wrote the seller and got some more blurry pictures via email - he was very busy and didn't really have time to sell them properly. I offered a buy it now price a few hundred less than his offer - but he decided to let the auction run its course.
No one bid.
After that, I wrote again with my offer and was persistent for two weeks, we managed to finally agree on a price and a week later I was bringing them home.
When I oiled them up I found the cabinets are in VERY fine condition. I have a spare set of lenses from an earlier project, and a few spare 2420 7 2405 drivers just in case I need them.

But even now they sound great and I feel VERY lucky and am grateful to have them ...
For me, the journey has just begun.