View Full Version : 2420 compression driver

07-24-2005, 07:17 PM
G'Day Fella's,
I have just come across a pair of JBL 2420 compression drivers without diaphragms. Would this be suitable for hi-fi use, and if so what horn (JBL or otherwise) would you recomend for 600hz cutoff.



07-25-2005, 05:12 AM
They would be very usable for hi-fi use. If you put in either d16r2421, or d16r2425 diaphragms you will have very good driver.

It is the same driver as the LE-85.

Search this forum for horn recommendations.

I believe it is crossed over at 500Hz in the S7R setup with H91 horn / L91 lens. Mostly you will find them crossed over from 1KHz and up.

07-25-2005, 09:38 AM
Put 8-Ohm aluminum diaphragms (D8R2421) in them and build 4430 clones crossed at 1 kHz using 2344A horns.

Mr. Widget
07-25-2005, 09:54 AM
I would use either of the 2421 diaphragms, but they are quite pricey. You will probably also be happy with the 2425 diaphragms at a far lower cost.

The driver was originally rated at 500Hz (back in the 60s), but later was considered to be best used above 800Hz. Personally I find it best used above 1200Hz. To me it can sound a bit strident in systems requiring a lower crossover.

Horn choice? It doesn't matter, any old piece of metal or plastic will do...NOT! The horn will color the sound more than diaphragm choice. It is a personal and subjective issue. The horn choice will determine the tonal quality of the driver as well as affect imaging, detail resolution, and just about every aspect of it's performance... picking a horn has been a long journey for me... have fun on your journey.


07-25-2005, 04:14 PM
Thanks Guys,
Looks like ill have to save some bucks to have a play!!!! I have been starting to have a play with higher efficiency speakers with my valve (tube!!!) amp, check out my web site home.iprimus.com.au/totaltech. To date i have some old H+H drivers, with fane compression drivers and medium size horns..... Although the sound is pretty good, im looking for something a bit better.