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Guido
08-31-2003, 12:12 PM
In the spec sheets of the 4425, JBL write that they used a "All Pass Crossover Network".
What exactly means that?:confused:

Where can I get the Audio Eng. Soc. Article about it (vol28 pp575-584)?

Does anybody have the Audio Eng. Soc. Article about Bi-Radial monitor loudspeaker design (vol31 No. 6 June 1983)?

Thanks for help

4313B
08-31-2003, 02:00 PM
http://www.aes.org/search/

http://www.aes.org/journal/search.html

http://www.aes.org/publications/preprints/preprints_search.cfm

Improvements in Monitor Loudspeaker Systems
As the recording industry enjoys the benefits of both digital and advanced analog recording technology, attention is appropriately focused on the use of compression driver and horn designs which are some 25 to 30 years old.
Preprint Number: 1784 Convention: 69 1981-05
AES Journal Vol:Issue: 31:6 Page: 408 Year: 1983
Author: David Smith
Author: D. B. Keele, Jr.
Author: John Eargle
hard copy $4.00 AES Member | $5.00 Non-Member

All-Pass Crossover Systems
Vol. 28, Number 9 pp. 575 (1980)
Author: Peter Garde
Abstract: A complete series of all-pass crossover functions is derived. These functions are useful in the design of crossover systems for audio equipment such as loudspeakers and signal processors.

Robh3606
08-31-2003, 06:53 PM
Hello Quido

I have both of the AES reprints drop me a line if you want a PDF of either.

Rob:)

4313B
08-31-2003, 07:35 PM
D'oh! My bad for posting links to a pay site :D

I just thought posting the links to their site might be worthwhile since that is the source.

Any major Library should have the entire set anyway...

If you don't already have this one, you might find it helpful as well:

http://www.jblpro.com/pub/technote/tn_v3n01.pdf

Robh3606
08-31-2003, 09:10 PM
I just thought posting the links to their site might be worthwhile.

Any major Library should have the entire set anyway...

If you don't already have this one, you might find it helpful as well:

It was a good idea and worthwhile. It is a good idea to look at the tech notes. They are a very good references and point the way with the referenced AES papers.


So what ever happened with the DMS-1?? It seems to be a milestone no one wanted or appreciated. Anyone actually hear a pair??

Rob :)

Rudy Kleimann
01-17-2006, 04:49 PM
I read a comment about the DMS-1 in another thread here that went something like, "You don't want to know what the JBL engineers really thought of the DMS-1."

Not certain what was meant by this comment; perhaps :barf:?

I think it was by a former employee of JBL, or maybe Giskard or Don McRitchie?

Maybe someone will comment on the DMS-1 here. I am curious myself. Ever since I saw 4 JBL 1400ND woofers for sale in a Pawn Shop in Austin a few years ago and researched their origins...

m8o
01-07-2007, 06:26 PM
I know this is about a year late ... You can visit http://www.nuhertz.com/ and download Filter Free which will Synthesize the Filter in passive or active or other to show you what it's all about. The free version won't do over 3 stages so you can't align a tweeter as you need more stages, but you can start with what it gives you, and move over the LTSpice for the remainder.

edit: The All-Pass filter is call the "Delay" filter in Filter Free.... as that is what it does; provides time alignment.