You really have not had a whole lot of luck with the car audio products...geez...
I'm not sure what to tell you about the subs and how to handle the return. I contended from the beginning that the perfects power handling numbers were overrated, but that being said, you should have been okay with 360 watts...my guess, is that something was wrong with the sub from the beginning...
I've got one question. what kind of box were you using?
