I have not yet measured either case. As previously mentioned, at mid-project I had to put the mid-bass horns on standby (I will get back to them, but must first attend to an ongoing emergency).
I can measure the free air resonance but space limitations have forced me to stand the first, nearly completed horn on its mouth while constructing the second; I am literally out of space and cannot set the first horn down to measure resonance with driver mounted, until all parts of the second horn are out of the way (the horns are made in quarters; in addition to the one assembled horn, there are currently three ten-foot-long pieces laying around, and a fourth under construction; a couple Toyotas would take less space).
You've already described how to measure resonance with driver in the horn; I assume getting the free air resonance can be done via the same procedure but without the horn; if there is something different you'd like me to do, post details and I'll do the measurements this weekend.
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