Good input, Art!
So, what we have figured so far is that the MF for the 4594 and the DCX464 likely have very similar output when displacement, sensitivity, and power handling are all accounted for.
The 4594 is specified to be good for 1kw above 500hz, but only 150w above 400hz. That equals about a 8.5db input difference. How much power should the displacement be good for at 650 hz then? Another 3-6db? That equals 2-4kw then. Now lets say that the DCX354 has half the displacement of the other two, which equals a 6db difference in displacement capability. In terms of power, we're now at 0,5-1kw. I don't know where others would like to set their peak limiters, but twice the nominal power handling of the DCX354 could be a good place to start, which equals 180w, which is less than half of the lower range in the example.
Now, testing is what it all comes down to in the end, and this sort of voodoo comparison can only give us rough estimations at best, but even if the rough estimations are off by an order of 3-6db, we should still be good with the DCX354 when crossed at 650hz.
Bennett has written that it leaves no compromises over 500hz when compared to the 464, which goes well along the lines of my very rough estimations.
Like I wrote earlier, I believe that the 354 is likely the new go-to for the PM90/60.
