Why not go to the SunDown Section and read or go to *** Forum you will get all the answers you need. There is plenty of feed back with people running the SAZ line @ .5...
Depending on your set up you could do an 150 easy with 1 - 15 and a 3 - 4k watt amp if your looking just for SPL only.
To many diffrent factors come into play IE: type of vehicle, box design and so on.