NVX has the best quality, probably the best cone & surround material I have looked at.
I replaced my Kicker CVR104's for these newer brand subs.
NVX quality & craftsmanship has impressed me ever since I purchased some of thier rcs audio cables recently.
I put these in my '12 Tacoma double cab with limited back space and RMS capability/mounting depth/box space. Paired the subs with a Rockford Fosgate @ 2ohm load. The end result is fantastic!!
These are SUPER accurate while being more loud than I could've imagined. There is SO MUCH force with these I had to secure the box to the backwall so the subs/sub box didn't run away from vibrating so much!! I did alot of tinkering & there were plenty of times I felt that I was going to damage the surround, it is an extremely flexible strong material. The wiring to the leads & spiders in so nice, eveything about the appearance it incredible. The end result: The kickers did not perform or sound have as clean, loud bass.