Difference Between 2445J and 2446?

[Chas]

I have a chance to get a pair of 2445J. Is the difference in diaphragm material -i.e. Al in the 2445 and Ti in the 2446?

How would the 2445J compare to my beloved 2441's providing they had the same diapgragm materials?

I need drivers for an upcoming 2397 based project......:smthsail:

[Alex Lancaster]

:) They are both Ti; 2445J = 4", 2" throat, 2425/6 1.75", 1" throat; There are a lot of posts of preferences between Al and Ti, Alnico and Ferrite, good luck.

[Guido]

AFAIK there is no significant difference between 2445 and 2446.

[grumpy]

The only difference I've been able to find in the documents for these drivers is regarding
the phase plug design description, in that the 2446 uses what is termed a "Coherent
Wave" design:

http://www.jblpro.com/pages/pub/components/2446.pdf
http://www.jblpro.com/pub/components/2445J.pdf

Do they sound any different? I wish I had the resources to find out http://audioheritage.csdco.com/vbulletin/images/smilies/smile.gif

-grumpy

[Mike Caldwell]

Hello

The 2445 and 2446 are the same driver body. The difference is that the 2445 used a smooth dome titanium diaphragm with the diamond surround and the 2446 uses a diaphragm that has small ridges pressed into it making it stiffer.
The diaphragms are interchangeable so you can upgrade a 2445 to the 2446.
I guess at high frequency the original 2445 diaphragm would distort in physical shape and pressing ribs into the diaphragm helps eliminate the problem.

Mike Caldwell