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Sorry for the confusion!!
I will continue in your large format comp thread: http://www.audioheritage.org/vbulletin/showthread.php?42373-Large-Format-Compression-Driver-Listening-Impressions

Amazing work Rob!
Have you had a chance to compare the 2453 with the 2450SL sonically?

Yes it looks like it has much more output, which is a really good thing.
But on the other hand it is difficult to get accurate measurements in the stop band with a horn as so much parameters come...

According to yours and JBL's measurements, both voltage curves should show the same thing, and make their respective driver reach the LR 36dB/oct target within a few dBs.

I included the protection...

Rob, could the 1.6kHz and 3.2kHz notch also be done in the passive filter?
It looks like the 476Mg would also benefit of these, together with a broad and gentle boost in the 2k-5k range

There...

476Mg vs D2430K voltage drive for the same 800Hz 36dB/oct Linkwitz-Riley acoustical target :hmm:

67204

Something interesting is that to obtain the same 36dB/oct LR acoustical target the 476Mg requires a 18dB/oct electrical filter, whereas the D2430K requires a 6dB/oct electrical filter.
That tells a...

Interesting!
So same "problem" with the phasing plug and horn throat interaction in the UHF.
Maybe you could try adding a little tube like in the the 2432, using something like a 1" MDF plate?

So you are going to build a passive M2?
That together with Mr Widget's cabinet design, JBL consumer will have some inspiration to draw from you guys :)

Impressive job and great result so far!
What crossover frequency and slope are you considering?