JBL L100, versions, crossovers and speakers

[santashooter]

Hi All
Danish JBL fan here - Please bear with any language-errors in the following

I am currently working on a set of L100's (non Century model) and I have a pair of L100 Century's coming up.
They are very beat up and with parts missing i am looking at a very big operation - (and looking forward to it as well)

Now, i know there are some different versions of the L100:
L100 century with LE20 tweeter and vertically aligned units on the baffle.
L100 Century with LE25 tweeter
L100 without Century and orange JBL Logo on the foilcal.

I have a couple of questions:
1. The LX12-10 crossover, is that used in both the L100 Century models, or just the Alnico one?
2. The L100 (not century) as that what is referred to as a L100A ?
3. I have seen a post here about a user finding an L100 (not century) with a LE26 tweeters which were originally LE25-2's, would it be common to see LE26 OR LE25-2 tweeters in later L100 model runs?
(Post here: http://www.audioheritage.org/vbullet...00-with-LE26-! )
4. What is the difference, apart from looks, on the LE25, LE25-2 and LE26 tweeters?

Thanks for the help, in advance!
and thanks for a fantastic forum, as well
Best regards
Soren ki

[LRBacon]

Howdy santashooter,

On the forum main page scroll down to and click on "Links" in the "Technical Reference - Read Only " category and then click on "JBL Consumer Tech Sheet Links," or just go to this link: http://www.audioheritage.org/vbullet...891#post121891

Once there scroll down to the several L100 links. These should help with identifying which version had which components.

Larry

[santashooter]

Howdy santashooter,

On the forum main page scroll down to and click on "Links" in the "Technical Reference - Read Only " category and then click on "JBL Consumer Tech Sheet Links," or just go to this link: http://www.audioheritage.org/vbullet...891#post121891

Once there scroll down to the several L100 links. These should help with identifying which version had which components.

Larry

Hi Larry
Thanks - that cleared up a lot.
I still, however i am unclear about the different tweeters.
Based on a couple of comments and posts in this forum, it seems some people have found L100A Late models with LE26 or LE25-2's mounted in them, though the tech sheets specify LE25 (or LE20's for the first L100 century).
I know the "correct" L100 is with a LE25, but would you consider a L100 with LE25-2 or LE26 to be wrong, or could it be that JBL assembled it like that from the factory, in the most end of the L100 run?

[LRBacon]

Howdy santashooter,
More than likely those L100s with either LE25-2 or LE26 tweeters were installed after they were originally manufactured. Check out these links: http://www.troelsgravesen.dk/JBL_LE20-25.htm
http://www.troelsgravesen.dk/JBL_LE26.htm
You might have a pair that have been updated with his components.

Larry

[santashooter]

Howdy santashooter,
More than likely those L100s with either LE25-2 or LE26 tweeters were installed after they were originally manufactured. Check out these links: http://www.troelsgravesen.dk/JBL_LE20-25.htm
http://www.troelsgravesen.dk/JBL_LE26.htm
You might have a pair that have been updated with his components.

Larry

Okay, thanks for the links - no mine are not with Troels Gravesen filters, but both with the L100a crossovers (2 caps, 2 lpads).
The reason for me asking, is that i got a pair up for restoration without the original LE25's and I need to source a pair, and i was simply wondering to what degree it would be incorrect to use LE25-2's as I have those on the shelves

[LRBacon]

Visually the LE25-2 is pretty much the same as an LE25 and I would imagine they are very similar sounding, so I personally wouldn't make the effort to find a pair of LE25s. I searched for an LE20-LE25 matrix like the one for the LE5-2 midrange family but couldn't find one. Getting back to LE25-2 usage, it was used in the L36 and crossed over at the same frequency as the LE25 in the L100 with a 4uF capacitor.

Larry

[santashooter]

Visually the LE25-2 is pretty much the same as an LE25 and I would imagine they are very similar sounding, so I personally wouldn't make the effort to find a pair of LE25s. I searched for an LE20-LE25 matrix like the one for the LE5-2 midrange family but couldn't find one. Getting back to LE25-2 usage, it was used in the L36 and crossed over at the same frequency as the LE25 in the L100 with a 4uF capacitor.

Larry

Thank you!
I will try and put a pair of LE25-2's in my L100's, and keep my LE25's in the L100 centuries, they have the same crossover, so i should be able to hear any differences, if there are any
Thank you very much for your feedback and help here Larry, it is much appreciated!

[santashooter]

btw, am i right in assuming the tweeters in this image is LE25-2's? (based on the non-red surround of the cone)

[LRBacon]

Santashooter, I tend to agree with your assumption. I had a pair of L36s and the tweeters in them looked just like those in that pair of 4311s.

Larry