Hello i rebuilt the S2600
now i mounted the driver on my horn!
my first impression wasn't very well..
is this an orginal JBL 2426h driver ?? or a unknown rebuilt?
Hello i rebuilt the S2600
now i mounted the driver on my horn!
my first impression wasn't very well..
is this an orginal JBL 2426h driver ?? or a unknown rebuilt?
greetings matthias
- Yes, that looks to be a JBL 2425 , the predecessor to the 2426 .
- Make sure it's the 8 ohm type by measuring the DC impedance ( DCR ) with a multimeter . DCR for the 8 ohm 2425H will be in the 3.2 to 4 ohm range . If it is twice that number then you have a 16 ohm 2425J . If you have a 2425J , the impedance mismatch with your present crossover values will throw the sound of the hipass all out of whack .
its the 8 ohm version
ok but is that the right driver for the S2600 ?
habe you the spec sheet of both drivers? 2426h and 2425h?
anyone from belgium sold me this driver as the 2426h!!!
Hi Matthias,
- Well, it's good the drivers are the correct impedance. That will save you from having to rebuild your crossovers.
- The performance of the 2425 and the 2426 is virtually identical .
- The changes that JBL introduced to the 2426 were just about all cosmetic. The 2426 has a removable, threaded, adapter plate / while the 2425 doesn't.
- Here's a link to the 2426 pdf among some other JBL drivers.
- Click this link to download the 2425 product sheet.
- In the meantime, Bernard is correct, you must listen to the woofer in the box along with the horn before any meaningful subjective evaluations can be made.
- I recommend against anyone opening up any compression driver if the person doing the "opening" doesn't know how to clean the gap of derbis & then recenter the diaphragm during reassembly . For instance ; It's quite easy to ruin a diaphragm by keeping those leads attached to the backcap and then lifting it out . The reason ? Those thick wires act like a third pair of hands, generally misguiding and hindering proper recentering & replacement of the coil into the gap.
thank you very much ! now its all ok !
ive testet the woofer + the horn !
its the same volume!
greetings matthias
That's good advice Earl.
Do you have a procedure for cleaning the gap and re-centering the voice coil when a diapragm is removed? The question has probably been answered before so maybe someone can send a link.
Cheers, Ralph.
Here's a pretty decent link on the subject .Gap Cleaning & Diaphragm Centering : The question has probably been answered before so maybe someone can send a link.
Ralph, did you ever purchase the 275nd diaphragms that you inquired about some time ago ?
Thanks for the link Earl! It's exactly what I needed to know.
I made some enquiries here on the forum but couldn't get any inside deals on the 275nd's. I then got a price from JBL in Australia but the price was way too high. Finally I got talking to Mike at Vintage Audio Sales and we worked out a deal for some used 2426's he has available. I figured that even if I didn't like them better than the original diaphragms in my 2420's, I could always sell them again. So now I'm keenly awaiting their arrival in the post. They should be here anytime now! Then I hope to have a solution to the uneven midrange response problems I have been experiencing. I'll keep you posted when I get some results.
Cheers, Ralph.
Hello! ive a question
ive opened the driver and took the diaphragma out
i took it in the hole back and close the driver - its sounds good
is this the right methode ?
i know i ve to work exactly but what can i do wrong by replacing?
greetings
- No, it was not the right method .ive opened the driver and took the diaphragma out
i took it in the hole back and close the driver - its sounds good
is this the right methode ?
- To find out about the correct installation procedures, read the posts from the thread that I posted a link to .
- The fact that it sounds good is somewhat beside the point.
- You just got lucky .
- The tolerances are extremely tight between the coil and the metal forming the gap. They can't touch . If the coil even just barely contacts the surrounding metal / the frequency repsonse curve is thrown off along with a substantial increase in distortion products .i know i ve to work exactly but what can i do wrong by replacing?
ok i checked this ! its all ok !
Matthias!Originally Posted by MatthiasA
You are crazy remove the dia without a clue!
Next time be careful with the screwdriver. If this gets into the magnetic field you need a new dia. 150 Euro.....
into the magnetic field?Next time be careful with the screwdriver. If this gets into the magnetic field you need a new dia. 150 Euro.....
you mean the dia?
if this gets into the dia? then i need a new dia.... ?
or how can i understand this?
There are currently 1 users browsing this thread. (0 members and 1 guests)