View Full Version : 2312 in 4345 instead of 2307

02-03-2012, 04:48 AM
Hi all, I am currently building a pair of JBL 4345 speakers, but in my gathering of drivers i find myself with a pair of 2307 and a pair of 2312.
I have heard both in other systems, and i have found the longer horn more pleasant in general (not so "harsh") but I guess the longer horn would mean a difference in phasing?:blink:
has anyone in here ever tried a pair of 2312 in the 4345 or know how it would perform and what I should choose.
the reason I ask, is to sell off the pair I don't need, in order to buy a pair of 2405's that I still need.

Of course, it probably ends up with me keeping both, and doing the experiment myself;)

all response is greatly appreciated
Best Regards
Soren from Denmark.

edit: I have tried the search function, but with no luck - though I am aware that it might be my ability to use the search function and not the available information on the site.:dont-know:

Mr. Widget
02-03-2012, 06:43 PM
I don't know if anyone has tried this... I'd be inclined to experiment myself. If you do, please let us know what you find out.


02-04-2012, 11:46 AM
If you find the 2312 superior to the 2307 I'll be happy to become your customer.

02-11-2012, 08:52 AM
In order to test the horns, i have to finish my project (obviously), and that is going to take some time.
I am thinking of parting with the 2312 horns, just to finance the 2405 drivers. (got a pair waiting for me)
I must admit i haven't thought it would be so easy to find all the components in europe - has taken me 2 months so far.
and all i need is the 2405 drivers, and they will be mine in the start of march.

But thank you everybody for the response - really love this forum!

best Regards
Soren from Denmark

02-11-2012, 10:20 AM
I think you would be better off going the other way. Use a 2" compression driver and the much shorter 2311. I was able to do this in my factory 4345's using the 2450, although I used the stock crossover and all my evaluation was by ear. 4313B did it in his build using the 2445 and a modified dog box for the 2122. Read his 4345 build thread--he may have modified the crossover also.

02-11-2012, 11:25 AM
I'm not real wild about the longer delay caused by the longer horn. It sounds smoother in the L300/4333 and that's about the extent of it.

02-11-2012, 02:56 PM
I have decided to stick with the original components, along with the original design.
The reason for this is, that originality and JBL's workmanship is really what I try to achieve.
I would like to call the finished product a JBL 4345 - I can't do that if it isn't the original components.
Along with that, I am building these because of a fascination of the stock 4345 - then modification is, for me, just a way to use money.
No intent to pass judgement on other modifiers - I guess its just the way one enjoys his hobby - i am not interested in squeezing the last out of my speakers - but more, I am interested in copying a pair of speakers because I just adore the workmanship and devotion, JBL put into their products.
It's like building a Jaguar E-type - one wouldn't put servo-steering in such a project.;)
On the other hand, It could be fun to see, how fast you can make a Jaguar E-type go.

It is just two different things and two different projects.

So I am parting with my JBL 2312 Horns, and buying the last pieces I need to finish the project.

02-16-2012, 05:52 AM
I'm not real wild about the longer delay caused by the longer horn. It sounds smoother in the L300/4333 and that's about the extent of it.

As I can remember, crossover point in 4333 is about 800Hz, while in 4345 is about 1300Hz,

so lower frequency=>longer horn(2312, L=11.5"=293mm ???),
while higher frequency=> shorter horn (2307, L=7.75"=197mm, or L=8.5"=216mm)

Just for reminder: 2311 ( 2" horn, L=4.625"=117mm) that was used in 4350/55 over 1200Hz

I was always puzzled about JBL mechanical dimensions....:




Pay attention the data about 2307 length (from 7.75" to 8.5", or 197mm to 216mm).

May the smaller value is so called "behind the baffle length", the difference is about 3/4"=19mm,

that is usual baffle thickness.

All above "small mouth horns" are used with 2308 Lenses.
I wonder is there any differences in the drivers impedance measured with and without the mentioned lenses-2308.:dont-know: