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Dr.db
11-22-2009, 03:21 PM
Dr.db
Hi folks,


Im a huge JBL-Vintage fan and just can't get off this georgious stuff :)
I got several K-Series and Tweets...
My current midrange is a 2470 with phenolic-diaphragm. Now I know this is not the first choice when you go for nice sound.
The drivers will be running at home, so no big punishing and extraordinous levels... But thou the K`s aren`t quiet either :D

So right now I`m wondering which drivers to look out for.
I actually don`t even know if I shell go for the 1-inches or the 2-inches...!?
They will be running from bout ~700hz to aprox. 15khz!?
I`m not shure yet bout the 15khz, but they have to arrange with my 2405 at top. ;)


I would believe that a 1-inch Driver will sound better in the higher mids.!?
So the only advantage of a 2-inch is the freq.range from 500hz to 1000hz where it simply has more power...
But above lets say 1500hz most 1-inch drivers will perform better ?
Or is any 2-inch driver even the best choice?


At this point I would reckon that the JBL 2420 would be the best sounding Alnico-Driver.
Would you go with me...?

But somehow LE-175 and LE-85 score way higher prices.... Do they sound better?
Which driver would be your first choice?


How does a 2420 compare to a 2441 ?




Thanks a lot for your help, I really do appreciate this!! :)

Regards Olaf

speakerdave
11-22-2009, 03:49 PM
What horn are you using?

Dr.db
11-22-2009, 03:54 PM
Hi Dave,


I currently have no horn for 1-inch or 2-inch....
(The 2470 are mounted on old, dented aftermarket-horns)

speakerdave
11-22-2009, 04:01 PM
I would characterize the difference between the 1" and 2" outlet drivers as being less distortion and more ease, more body in the larger drivers, particularly in frequencies below 1200 Hz, but the differences are easily discernible above that as well. Either one can be used to 9 or 10 K with no problem. The 2405 can handle it from there on up.

JBL at one point decided to have a separate line of professional components and renamed some of the drivers it had been selling for decades as consumer/professional with four-digit model numbers. Do some reading in the library to get the drift of that.

speakerdave
11-22-2009, 04:08 PM
You need a horn. In my opinion you would do yourself a favor by starting with a pair of 2370's or 2345's. Either should come well below $200. I have heard the 2470 with the 2345, and I think the combination is quite listenable. The weak link in your system is what you should address first. It's your horn.

Also, the 2470 dies at 9k, and if you do not have your 2405's running now you are not getting any UHF.

Clone the high-pass only portion of the 2405 part of the 3107 and it will blend in pretty well, I think. For not too much money you could get a big improvement without starting all over from the beginning. I would even do that before replacing the horns.

You also need the correct crossover for either the 2370 or 2345.

4313B
11-22-2009, 04:17 PM
I actually don`t even know if I shell go for the 1-inches or the 2-inches...!?

JBL Technical Notes Volume 1 Number 8 (http://audioheritage.org/vbulletin/showthread.php?t=4410)

speakerdave
11-22-2009, 04:20 PM
The best midrange will consist of a driver, a horn, and appropriate crossover. It's one unified package, and there is no point in considering only one part of it.

Dr.db
11-22-2009, 04:21 PM
Hi Dave,

thanks a lot for your well thought and helpfuly answer!



Did I get you right whith the following; the 2441 is even above 1khz "better" than the smaller 2420 ?
(right horn and crossover for both...)
I thought the 2"-drivers would be less accurate in the high mids....




The 2470 will be mounted to a small PA, so it simply won't be around in future ;)
That's why I am looking for an alternative and upgrade.

speakerdave
11-22-2009, 04:24 PM
Read the referenced technical note.

dino
11-22-2009, 04:28 PM
I love the jbl le 175 sound. If u know some one who have those drivers u are looking to install in your cabs. ask could u use them to try out which one sound the best to your ears .

speakerdave
11-22-2009, 04:36 PM
. . . . I thought the 2"-drivers would be less accurate in the high mids....

It's just not that simple

Dr.db
11-22-2009, 04:38 PM
I just had a look at the referenced technical note and believe a 2"-driver is what I will go for!


So which horns & lenses would fit the best...!?

Does a difraction lens falsify the sound?

speakerdave
11-22-2009, 04:53 PM
To honor your original request--from my experience.

For me personally, TAD TD4003 on Th4003.

By reputation the JBL 476 is every bit the equal of the TAD, but I have not heard it, and it is not available separate from the Everest II anyway.

As to what is worth checking out--

In JBL I've heard the 2450 with SL diaphragms in the 4345, and it is very good.

Also the 2450 with SL diaphragms on an Emilar EH500 with an active crossover, but just briefly. I made a mental note to check it out more thoroughly.

I suspect, because it has been recommended to me, that I would like the 2440/41 with SL diaphragms even better.

The non-beryllium capper in JBL may be the 2452SL, a very modern driver, on the 2352, but I have not tried it yet.

You may soon discover that budget must be decided upon.

speakerdave
11-22-2009, 04:54 PM
. . . . Does a difraction lens falsify the sound?


No

jcrobso
11-23-2009, 12:25 PM
"My current mid range is a 2470 with phenolic-diaphragm."
I have both LE175s and 2470s, I swapped out one of the LE175s with a 2470 in my 3 way system. I could not tell the difference, between the two crossing over at 4.5Khz to the HF driver.
You could get 2420 diaphragms for the 2470s and this will give you a better high end.
Yes 2" divers will handle down to 500hz, but 2" horns tend to big!
http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=294-425&ctab=2#Tabs

The lens does not color the sound, at least to my ears. The used market tends to be the about the only way to get them.
McCauley and Beyma used to make clones of the JBL H/L systems.
What "Ks" do you have?

Dr.db
11-23-2009, 01:12 PM
The 2470 will be mounted into a PA, not into my homesystem. So they`re gone ;)


I got a pair nos K-110 and K-120, both 8ohms...

Ian Mackenzie
11-23-2009, 05:01 PM
The 2470 will be mounted into a PA, not into my homesystem. So they`re gone ;)


I got a pair nos K-110 and K-120, both 8ohms...

In that case you would be wise to consider a 2397 (plenty on Ebay) and a 2 inch JBL driver. That combination is easy to get working in diy project

I have heard the K-110 with a JBL 2397/ 2441 in hi end club system with 3 K-110 stacked vertically below the 2397 and dual 2226 and it was superior to the likes of a 4350. See Drew's clues in the library.