I recently purchased 2 P1 15's and a prime 500.1 amp for a budget daily system.Going in i knew not to expect much from a $100 250 watt 2 inch coil subwoofer.But i wanted somthing that would sound half way good and last along enough to save up for a better system.I put them in a prefab box and sounded okay but anything below 40 hz it sounded horrible.So i built a 5 cu.ft box tuned at 32 and no luck at playing low notes.Still sounded like a**.And know with with less than 3 hours of play time (which i was really being easy on them) and gains set correctly the sub is already started to sound funny and smell like burnt coil.I am not a kicker fan but ive had pos comp's sound better in a sealed box.I will never buy anything rockford again.Im thinking about getting 2 sundown e15's.