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Author Topic: Tunings for compression driver in JBL SR4722  (Read 949 times)

Peter Johnson 793

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Tunings for compression driver in JBL SR4722
« on: April 17, 2015, 10:06:49 am »

Hello,

I have an old set of JBL SR4722s (first series with 1/4" jacks) with 2206H woofers and 2416H compression drivers.   I am working on bi-amping them. 

I have a DBX driverack PA2 which has tunings loaded in it for the JBL SR4722X, but not the SR4722.  DBX has no tunings that I can find online for the SR4722 . 

The "X"  was basically the same box as mine, the same woofer, the same X-over point (1.2khz), the same horn, but a different compression driver - it uses a 2417H.

So I was thinking that I could load the tunings for the SR4722X and then maybe I would need to make adjustments on account of the different comp drivers.

But what adjustments would I make.    I've looked around and the only thing I've found seems to say that the  2417H was 5 db more efficient than the 2416H- due to a thinner diaphragm?

Any suggestions for me?

Thanks

Pete
 
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Tim McCulloch

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Re: Tunings for compression driver in JBL SR4722
« Reply #1 on: April 17, 2015, 01:09:14 pm »


Any suggestions for me?

Thanks

Pete

Contact JBL Professional.  They can give you the info you need or at least point you in the right direction.  Failing that, how about using the 4722 setting and using your ears?

Efficiency and sensitivity are different things in transducer design.  Efficiency is how much electricity gets converted into acoustic output; sensitivity is how much SPL is produced for a specified electrical input.
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Peter Johnson 793

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Re: Tunings for compression driver in JBL SR4722
« Reply #2 on: April 17, 2015, 04:12:34 pm »

Contact JBL Professional.  They can give you the info you need or at least point you in the right direction.  Failing that, how about using the 4722 setting and using your ears?

Efficiency and sensitivity are different things in transducer design.  Efficiency is how much electricity gets converted into acoustic output; sensitivity is how much SPL is produced for a specified electrical input.


Thanks Tim,

I've sent  an email to them.  I can try my ear, or use it to make fine adjustments, after getting as far as I can with the published tunings.   I may end up there.  Let's see if i get a response from JBL. 

My speakers are oldies but goodies  - I understand that nowadays all of this is built right in to the speakers.
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