So, the wizzer in a speaker cone isn’t considered a tweeter?
Sounds like semantics over function to me but I am not a rigid student of the art - just a function over form kind of guy . . .
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A coaxial is still a 2-way design. It just happens that both drivers are within the same package instead of separate. The woofer cone gets a lowpass filter applied. So the power it sees (to cause cancelation) tapers off as frequency goes up, handing off to the tweeter to take over via it’s highpass filter.
A wizzer (whizzer?) is a secondary cone attached to the same coil/former. Both cones see all the power through the whole frequency range so the primary cone is still causing cancelation. But exactly what goes on starts to get into modal territory. As the primary cone would go through breakup. So there is all sorts of physics competing at the same time. And why some might say only wizzards can employ whizzers effectively 
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The Audio Nirvana 6.5 in with whizzer cone ++.
For comparison in the same setup, here is the Satori MW13TX 5" midbass and the Peerless DA25TX. Not necessarily a fair comparison since this setup costs a bit more (and I should have done the off-axis measurements on the coax) but this is more like something I’d like to work with. And so it shall be!
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So we don’t know what crossover was used in the Gowa video?
No, we do not - just implied; active.
Bummer.
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I wonder how much difference there is in the squigglies of SBA’s and Dans nearfield measurements?
SBA’s are on an IEC baffle board at 14.2" = 31.6 cm.
I really want this graph to be true . . . .
You can trace the on-axis curves and then simulate them for baffle diffraction in VituixCAD. I don’t remember the steps, but I bet if you ask AI it can walk you through the steps.
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Here is a link to dcibel’s pdf on how to go about doing this:
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Look what I found just sitting there on SBA’s website under the Tech Notes link →
They have a “in wall” crossover posted for all of their coax drivers. This will sound very anemic in the bass responce if used in a speaker cabinet. Might be a good starting place.
If used as a mid/tweeter (applying their Passive XO) atop a woofer and crossed using DSP should eliminate most listening position FR deviations via PEQ, yes/no?
This is my desired use - Coax in a 4-way stereo speaker pair - monitors for near to mid field.
With this crossover you could use dsp to correct baffle step loss and some difraction issues. Can you beat physics, no.
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