You know even the JL Audio 8w7 and 10w7 have insane response.
I just modeled the 8w7 with Wmax's paramaters and it's even better than the modeled ones for extension.
I was able to model it to like 17 hz for an 8 inch
The 12w7 has an extremely high excursion and would be a sick sub. I modeled it in the Kappas box parameter and it had like 6db more.
I've fallen in love with a new set of subs. These things are gems IMO. I have no choice but to save up and build a pair of new speaker stands. I don't care if I loose money on the 12.1 drivers. I really like the potential of these JL Audio drivers.