I’m running the 10 inch reference series high excursion woofer. It’s a little more money, but I do like it better than the HO. I have it in 1.2 cubes @ 30 HZ and I’m diggin the SQ. Beautiful sounding sub.
I think you could probably do anywhere from 1-1.5 cubes per sub net. I did 2 of these in 1.9ish cubes ported and it worked, these subs are low end oriented, fyi.