Yeah, I really don't expect making any real improvements. I'm just curious and also I desperately need to put my hands on something physical now - for too long I have been doing a purely abstract work.But even without those advanced technics, when you use a modern type compression driver with very high to out of range break ups, with proper ABEC sims the results are already really good!
Would this be OK?... Just need to space the mic ports along the tube, probably in some random, certainly not equal, spacing. How many is up to you and your computational capacity.
I thought that prof. Merhaut demonstrated that years ago but after I looked at his paper* again I see he in fact used short pulses as test signals (and then gated FFT). It was in 1985 so I wonder if it was because of the lack of todays techniques (MLSSA came in 1987, IIRC) or because it was so obvious to him that it would be wrong (but then I think he would mention that).As to using gated measurements, I have always thought that should be possible, but honestly I don;t know anyone who has tried that.
Basically, by moving the crossover frequency lower (by means of a larger horn), the less of phase distortion there will be in the most sensitive hearing range - that's a simple fact.