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Multi-Way Conventional loudspeakers with crossovers

JBL D2 dual concentric compression driver
JBL D2 dual concentric compression driver
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Old 16th August 2013, 08:14 AM   #1
hasselbaink is offline hasselbaink  Denmark
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Default JBL D2 dual concentric compression driver

Hi,

Has anyone tried this driver or listened to it?
JBL-D2

There is a lengthy discussion on the Lansing Heritage forum about the M2 monitor that uses the D2: JBL Master Reference Monitor

I would sure like to know if it is available for purchase.

Best
Kris
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Old 16th August 2013, 01:29 PM   #2
1audiohack is offline 1audiohack  United States
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They are available. They are also used in the VTX series array systems.
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Old 18th August 2013, 05:27 AM   #3
ewgrosschris is offline ewgrosschris  United States
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Cant say much other than, I think they make a night and day difference in the VTX compared to the Vt4889's. I'd love to see what some forum members can do with these.
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Old 18th August 2013, 06:17 AM   #4
NEO Dan is offline NEO Dan  United States
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While I can't comment directly on the D2 I do see the 2408H mentioned in the article, I have those and they are pretty amazing. Here is a LOUD three tone distortion sweep at 100w, the cabinet is tuned to ~93Hz. Not bad for a "small" driver IMO. WAY WAY more output capability than needed for domestic HiFi.
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Old 18th August 2013, 06:36 PM   #5
LineSource is offline LineSource  United States
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How low in frequency should a horn directivity pattern go for home audio?

The latest home audio high efficiency options:
coaxial ring radiator compression driver vs.
single Beryllium diaphragm compression driver vs.
Synergy Horn

JBL: two identical annular diaphragms combining in one common exit chamber.

BMS: one large annular midrange diaphragm combining with one ultra light high frequency diaphragm into a common exit chamber
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Old 18th August 2013, 07:36 PM   #6
NEO Dan is offline NEO Dan  United States
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If you are thinking of the speaker as a whole you'll want directivity to extend below the mid hi horn and so the limitation is really in the bass section.
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Old 19th August 2013, 02:19 AM   #7
mayhem13 is offline mayhem13  United States
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Had a change to listen to the M2 at an industry event......as I indicated in the JBL horn thread, best speaker I've listened to yet. There's a real magic in that waveguide/driver combo.
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Old 19th August 2013, 03:26 AM   #8
LineSource is offline LineSource  United States
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Quote:
Originally Posted by mayhem13 View Post
There's a real magic in that waveguide/driver combo.
The avsforum has a few threads on using BMS coaxial compression drivers with the "you can buy it now" SEOS 24 waveguide.


just another seos 24 build
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File Type: jpg seos_24d_1.jpg (66.9 KB, 616 views)
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Old 19th August 2013, 04:15 AM   #9
NEO Dan is offline NEO Dan  United States
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You've been able to buy good medium format stuff for quite some time now... For less...

3722/4722 PTWG
Click the image to open in full size.

I think there should be some distinction between what the M2 is as a system and what a DIY'r can do with the waveguide and compression driver. There is a gap there, and that gap is filled with $$$$ IMO.
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Old 19th August 2013, 09:10 AM   #10
hasselbaink is offline hasselbaink  Denmark
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Thanks for the replies guys.

I really would like to see the raw measurements of this driver, both diaphragms, to see how easy/hard this driver is to work with.

BTW, this will be for home use and I would try it on a few different horns as well.
My motivation is that I would very much like to see a driver that combines a large format diaphragm with a tweeter AND sound great at the same time. If we could knock path differences and lobing issues in the head, wouldn't that be fabulous!

PS. Who is selling these? (please provide a link)

Best
Kris
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