With 99dB sensitivity it can be driven by anything, though to keep the driver count down (at 8 woofers instead of 16) it does have a 5 ohm impedance. Of course that's with 8 ohm drivers; using 16s or 4s you can go 8 drivers for 8 ohms. I wasn't concerned about the impedance as with that sensitivity it won't be drawing a lot of current.You're correct about the configuration, though the exact details I can't reveal until publication.
The problem with PVC is that if left unstuffed it's a very resonant speaker, a one-note if you will, and even stuffed isn't as good as a tapered line. Ten feet gives quarter-wave tuning at 28 Hz, and that's probably well below the Fs of a driver small enough to fit it, so a mis-match there.
Two drivers is the way you mention is feasible, with tuning perhaps a third-octave apart to smooth things out.
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