Here is the 4507 with driver removed, and pics showing waveguide's attempted fitment.
Thank you for doing this photo analysis, Russell.
It appears to me that those ports must be closed, and the waveguide snugged up to the edge of the woofer. Even then, I'm not sure the brace would have to be moved. See Brandon's final analysis of the waveguide cutout where he demonstrates that a much smaller one is required if its front edge is rounded over to match the contour of the rear of the waveguide.
With only two ports left, I'd be looking to enlarge those and installing the proper length ducts for the desired tuning.
Replacing the front baffle would not be a huge deal, either; there's material all around the edges to remain as a cleat to attach a new flush front.
Zilch, I thought I heard an echo of wanklessness when I read the various "F Tooleism's" & quote attributed to J Gordon Holt over at Duke's place...
Indeed so. In the end, it seems Holt became disillusioned with much of "convention" in his field.
Using a pair of the boards Jack made( for e'wave), to put this new 5 element crossover....
It's the V1.1 board which separates the HF comp I'm using, and I'll show detail on how to fit up the Schumacher crossover. The 4.7 Ohm resisistor goes in instead of J3, and other components are reoriented.
As to the placement of the coil. Pete initially said to put it across the tweeters poles. this would place it after the 2 resistor, and after the L-pad aswell. does this have the same effect as when it is place where you show it on the newest schematic? If its placement isnt that important, would it work to put the 1 mh coil in the standard location on the board for the HP coil that was originally used in E'wave?
I tried it in all three positions, and in detail, the forward axis moved. I picked the topology producing the optimum result. With the waveguide flush mounted, as I intend ultimately to do, the forward lobe will be right where we want it to be. This should be verified with any alternative drivers or layout.
Here is the final vertical polar map of the pair at 22.5°; we're good (-6 dB) to +/- 15°:
