I'll call BS on Paradigms marketing hype at this point... That sub may be able to produce usable output at 9hz in a closet, but in my 8200^3 room it will offer no advantage to me then one of my single heavy duty 15" drivers.
9Hz doesn't mean it will have usable output at 9Hz. No single commercial subwoofer can reproduce a 9Hz tone at usable volume (110dB). It also doesn't say whether it is flat to 9Hz, which is impossible without EQ. It can be 15dB down at 9 Hz, which is not so "good".
I'm sure it has built in EQ but I doubt that sub offers any more linear excursion then my TC3000 or possibly even the TC2000.
It is very nice to see that Paradigm is stepping up to the plate to replace their long overdue need to upgrade their line of subs. The Servo 15 .v2 is a pretty darn good sub, but Andrew/avaserfi, me as well as others that have used measured super drivers will attest to the superior SQ over that sub.
Paradigm is a very proficient manufacturer of its own in house drivers, but the price of this sub is reaching in terms of value. JL walked that line and did very well, but in the end you can acquire an F113 for $2200-2300 new with warranty.
I will be happy to build you a sub that easily performs as well for far less then 1/3 that price...