So I’ve just downgraded to two ZVX 8’s. I have 4 total I made three tubes two for my car and one for my small suv. I tuned all of them to 30hz and they are in a 1.20cf after displacement. I wanted to go more sq this time as a posed to spl. I wasn’t sure how these would turn out to be honest, I’m super surprised on how well they get low. Not gonna say they are as good as going with the EVL or anything but really good at putting quality sound out. These have been amazing subs no questions, yes they are more at home in a spl build but really are versatile AF. I believe that they would sound a bit better if I would have done an IB (infinite baffle) just because they have a very height qts and are very stiff. All in all I’m super happy with all of my SKAR products and can’t praise them enough for what you get for the money.
I purchased these bad boys and built a customer center console for them and they get down, still in the process of breaking them in.