JBL 2445J + beryllium diaphragms - feedback?

[gafhenderson]

Has anyone got experience with JBL 2445J compression drivers, with or without beryllium diaphragms ?

Are they worth picking up 2nd hand vs some new Radians?

 

[fpitas]

This may be a helpful link:

Beryllium upgrade for JBL compression

 

[ORNJ]

I have not heard the 2445J with the Be diaphram but I have heard the 2446. I would say it is a solid upgrade.

 

[fpitas]

What is your upper crossover frequency? And, pro audio or home use?

 

[weltersys]

I have not heard the 2445J with the Be diaphram but I have heard the 2446. I would say it is a solid upgrade.

The 2446 has an "upgrade" to the phasing plug design over the 2445, but still uses a titanium diaphragm.

I have not heard a 2445 with a beryllium diaphragm, but I doubt that pushing the breakup modes slightly higher would eliminate the hashy upper end that the driver has above 5000 Hz.

 

[Robh3606]

If you are looking at JBL cores you might want to consider a 1.5 or 2" with their latest phase plug design. You also should consider what horn's/waveguides you like vs. the throat size. The newer drivers all use the same phase plug only difference being the throat size.

Rob

 

[gafhenderson]

The 2446 has an "upgrade" to the phasing plug design over the 2445, but still uses a titanium diaphragm.

I have not heard a 2445 with a beryllium diaphragm, but I doubt that pushing the breakup modes slightly higher would eliminate the hashy upper end that the driver has above 5000 Hz.

thats what i was looking to hear. is this the regarded opinion of the 2445?

 

[weltersys]

thats what i was looking to hear. is this the regarded opinion of the 2445?

I used a lot of them in floor monitors (500 Hz up) and PA (1200-5000 Hz) from around 1982 until 1992.

They could be equalized to have flat response up to 16 kHz, but the HF response was quite distorted, put in a 6 kHz tone, and get out a 6 and 12kHz tone near the same level.

That is what I meant by "hashy", "esses" and cymbals just don't sound right.
Crossed at 5 kHz with a tweeter above, no problem.

The later 4" diaphragm JBL drivers seem cleaner, but for going all the way up without a tweeter, I prefer 3" (or smaller) diaphragms.