alright imma explain the WHOLE story, this guy bridged my 2 12's on my amp, and it was kool like that for a few weeks but this other guy told me that wasnt good so i un did that and wired them each with a positive and with a negative. then my girl decides she wants to see the difference and turns and the bass and subwoofer all the way up then turns the volume up. that blew the fuses on the amp and when i changed those one of the 12's sounded like it's blown and the other one doesn't even work, i can't hear anything out of it. im a beginner at all this and im asking this ? so i can get good at it. so my ? is if my subs are blown now is there a way that i can fix them, and how can you tell if they are blown. is there anything that notice on the sub that you would know that it's blown or not? thanks.