the other day i was driving then i heard a thump so i pulled over to check it out and when i poped the trunk i noticed my sub had fell out the box , so i figured maybe thats why it stoped working, then i went hope put some more screws in it and plug it baq in, i got a lil something but when ever i turn up the radio loud the bass out basically cuts out, does anyone have an explaination for it or any suggestions? i checked the ground, seems to be pretty tight but i dont know any input would be appreciated.