i have had two of these subs for seven months now and i started with a sealed box and i was not very impressed. i bought a 70$ ported box here on sonic and wow, these will actually hit hard. i have them hooked up to a 1000W amp. if you are looking for lots of bass i would not suggest these, if you are looking for a fair amount of bass and it be clean, i would suggest these subs with a ported/vented box. make sure you hook these up to a high quality amp!

I hooked this up to an MTX Road Thunder 250 Mono amp on a 2ohm load, it hit hard dang hard in a sealed box. Then a week later it quit. I guess MTX was too much for it. Gonna try a diffrent sub this time.