What's so special about the Augsburger mastering monitor?

[pos]

Wow, twice the price for the exact same driver, except for the foilcal :

http://www.proaudiodesign.com/Pro-Au...s-GAH4K-B.html
http://www.usspeaker.com/radian%20950Bepb-1.htm

Same goes for their woofers apparently...

[allen mueller]

I found the interview again here's the link:

http://www.prosoundweb.com/article/p...rge_augspurger

From the above link:

R-e/p: Why use two fifteen inchers per cabinet?
GA: You use two fifteen inch woofers in high-power monitors simply because you have to, to be able to get the power levels that are required without blowing out woofers.
It would be nice in some respects if you could do it with a single fifteen, but if you really want to give them assurance that they’re not going to blow woofers out, the dual fifteen seems to be absolutely necessary.
The woofers are mounted on an inverse “V” which is really not deep enough to be called a horn.
It is an attempt to do two things. Number one, to push the woofers back a little bit to get a more desirable relationship between the woofers and the high frequency driver. I know that about six to eight inches is what we want there to make the crossover network come out right.
Number two, the woofer angle gives more horizontal dispersion up in the mid range where they start becoming directional.
In this case, it happened to work out just right, because one woofer is turned toward the mixer and the other is pointed toward the producer and we get a pretty good balance across the console.


Al

[natehansen66]

I've been lurking Audio Heritage for a couple years now, but I've never posted. Some of you are wondering about the directivity of the dual 15's....and I have data

These are dual AE TD15M in 3 cu ft sealed cabs, angled in to create about a 120° angle between the baffles. Ground plane measurement at about 12':



I also have data for parallel baffles, and with the baffles at 90° with a board over the top to create a "horn". I can tell you that angling the baffles in has a negligible effect on the directivity (which is obviously beaming by 500-600hz) at least measured in the far field. If you are within about +-5° of the center axis of the speaker I guess you're ok.

I don't have any JBL stuff here so I'll go back in my hole

[pos]

Thanks for that measurement!
So it appears the angling does not affect directivity other than by reducing the horizontal span of the source.
This was to be expected

I hope you post more often here, and even if none of your drivers have a JBL foilcal on their back I am sure most of them bear a strong Lansing lineage
I think your approach to speaker design and directivity control would interest a lot of people here, and bring new ideas for those JBL drivers we all have laying around.

http://www.diyaudio.com/forums/multi...-disorder.html
http://www.diyaudio.com/forums/multi...waveguide.html
http://www.diyaudio.com/forums/multi...-cardioid.html

[natehansen66]

Will do