The Kove is a hell of a great subwoofer, its hard now a days to find subs like this. I have a Kove Armageddon U2 !5" in a sealed box and i am very inpressed with it. Its true about what they say about them though, they are power hungry and you have to power them just right with proper charging equipment, like a cap, or an upgraded Alt. I am running 2-2 farad caps for my amp running the Kove, I have a 1000.1D Xtant amp and it gives it spenty of power, if I wanted to I could possibly peak this sub with the amp I have now. I am running the subwoofer at 2 ohm by running the voice coils parallel to each other. And before I forget the sub is a Dual 4 ohm, running off a mono amp.
Word of advice, if you get the Kove, Hang on to it, its one of the better makes in the past like the OLD SCHOOL LANZAR DC SERIES SUBWOOFERS (EXTREMELY GOOD!!!)