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Old 19th December 2013, 10:00 AM   #1
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Default JBL 2445J + beryllium diaphragms - feedback?

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?
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Old 19th December 2013, 01:29 PM   #2
fpitas is offline fpitas  United States
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This may be a helpful link:

Beryllium upgrade for JBL compression
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Old 19th December 2013, 02:39 PM   #3
ORNJ is offline ORNJ  United States
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I have not heard the 2445J with the Be diaphram but I have heard the 2446. I would say it is a solid upgrade.
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Old 19th December 2013, 05:24 PM   #4
fpitas is offline fpitas  United States
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What is your upper crossover frequency? And, pro audio or home use?
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Old 19th December 2013, 05:30 PM   #5
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Originally Posted by ORNJ View Post
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.
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Old 19th December 2013, 05:32 PM   #6
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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.

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Old 19th December 2013, 05:48 PM   #7
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Originally Posted by weltersys View Post
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?
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Old 19th December 2013, 06:04 PM   #8
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Originally Posted by gafhenderson View Post
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.
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