Not sure if you forgot anything at all. Now that I've taken an interest in coaxials, I just have to learn all I can about them. I did the same with single fullrange drivers a few years back.
A while back I recall reading where some types of coaxials experience a narrow but rather deep notch in the highs. I have measured a notch like this on the 15 inch coaxial I have now. It's at 10 kHz. Seems like I read it had something to do with phase cancelation. I don't remember where I read this and was only mildly interested at the time. Know anything about this?
Most compression drivers have a strong HF standing waves in its phase plug's channels just like in a BR's vent, varying depending on design, so you get a null, then a peak before the final roll off in a plane wave tube measurement. How it performs attached to a horn depends on its design.
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