So i just purchased SA 12 4OHM after spending alot of time looking at reviews i think i should be happy with this sub. I also purchased a MB quart onxy 1000 watt amp. I have a single 12 box that used to have a jl w3 12 in it the box is ported would that box be fine for that subwoofer. And if any one has put a sundown sa 12 4ohm in a truck let me know how the sub sounds in your truck i have 94 ford ranged extended cab. Im excited:hapydanc: