Note these subs are rated for .4 to 1.0 CF in a sealed enclosure.
I'm runing my Alpine Type R 12" in a 1.25CF enclosure and it sounds decent. I may still try and reduce the box volume at some point to see what the difference is.
I like this sub. The goal of my system is SQ, and this seems to fit the bill perfectly. The only thing I've heard that I'd get rid of it for is a 12W6V2.