View Full Version : VRX932LA

06-03-2005, 05:02 PM
So I have finally got to get my hands on 2 of the VRX932LA's and I must say they are amazing. 100 x 15 dispersion, and you can mount two on a stand and get great coverage in a smaller room. I cant really put into words how impressed I was by them but the 2407 is what caught my eye. Very impressive for such a small driver. I am going to find out what the price is for the drivers over then next few days hopefully. It is definately sparking some interesting thoughts


06-03-2005, 05:06 PM
Looks great, I wan't aware of these, but you've sparked my interest. Let us know what you find. :applaud:

06-03-2005, 05:49 PM
I'm certain much of the audio quality has to do with the special waveguides the HF drivers play through, and there are 3 in a "slot" type of array configuration. I'd be willing it'd be hard to duplicate the HF performance with any type of standard horn arrangement on that driver...


06-03-2005, 06:29 PM
I'm VERY anxious to trial them. That same Differential Drive woofer is in the SRX line - I use their (stage) wedges now, to rave reviews from the artists. I mean RAVE reviews. No-one has ever heard so clearly and at lower gain.

What is the configuration you're running - EQ, xover, amps, etc.? Would love to know...

Jan Daugaard
06-04-2005, 01:40 AM
Is the 2407H compression driver available separately? I can only find it as a part of complete speaker systems.

06-04-2005, 11:50 PM
Im going to find out if it is obtainable i should be able to get my hands on a couple im not too sure though

06-04-2005, 11:53 PM
It's on the transducer list at JBL Pro, $199 ea. list. There's also a cheaper 2406H and H-1 at $133 ea., whatever they are....


Jan Daugaard
06-05-2005, 02:41 AM
The frequency response of the 2407 is found here: http://www.alphasound.dk/data/VRX932LA.pdf

There is some more information here: http://www.jblpro.com/pub/cspels/CBT4%205-5-03.pdf

The 2407 appears to be the successor to the 2426.

06-05-2005, 07:00 AM
It seems to me the 2407H is substantially different than the 2426H, in that it's a ring-radiator driver. That'd be a huge departure from JBL's convential compression driver technology, (except for their current ring radiators, the 2402H, 2404H, and 2405H).


Jan Daugaard
06-05-2005, 08:02 AM
Hi Johnaec,

in http://www.jblpro.com/pub/cspels/CBT4%205-5-03.pdf we are informed that the 2407H has a 'center-clamped' titanium diaphragm. What does 'center-clamped' mean?

Jan D.

06-05-2005, 08:39 AM
What does 'center-clamped' mean?Look at post #5 in this thread: http://www.audioheritage.org/vbulletin/showthread.php?t=4161 There you will see an opened up cener-clamped 077 ring-radiator. The 2402/075, 2403/076, and 2404 use the same method, but with different "center-clamps, also known as "phase plugs":

In the 077 picture shown, the clear part sits on top of and "clamps" down the center of the diaphragm - the radiating part of the diaphragm is the silver "ring" portion around the center "clamp" - this is why they're referred to as "ring-radiators". The blue portion is simply the outer mounting flange, ehich doesn't move. The silver inner ring portion is the only part that moves - it's "clamped" down in the center and the outside.

This thread shows what the phase plug looks like for the 2403/076 and 2404H: http://www.audioheritage.org/vbulletin/showthread.php?t=4629&highlight=076 This style is conical because of the horn design, but it functions exactly the same, to hold the center of the diaphragm down and also assure correct phasing/dispersion of the sound waves through the horns mounted to the front.


06-05-2005, 10:40 AM
The 2407 appears to be the successor to the 2426.HUH?

2407 is a tweeter.

If it can be said that there's a successor to 2426, it's 243x....

Jan Daugaard
06-05-2005, 12:48 PM
JBL is using the 2407H from 1.2 KHz; see e.g. http://www.alphasound.dk/data/VRX932LA.pdf

Jan Daugaard
06-06-2005, 01:53 PM
According to http://www.jblpro.com/ae/pdf/spec_shts/AM4215_95.pdf the 2407H/MTA is a 1.5" throat exit compression driver.

Is the MTA then a 1" to 1.5" throat adapter? Because elsewhere we learn that the 2407H has a 1" throat exit.

It would be nice to have the 2407H specification sheet ...

06-06-2005, 02:39 PM