Audio Systems: my car subwoofers, rca jacks, car subwoofers

Question
yesterday i was cut off by some driver and i had to stop real quick and my ground came part out and my subs were skipping when they hit. i pulled over and they shut off. later i checked and the ground came completely out. when i connected the ground back up my subs sounded different. they were not hitting as hard as they were before. later i started messing with my head unit and when i only had one sub on the sub sounded great but when i turned them both on the bass was not deep. i have no clue what is wrong PLEASE HELP ME.

Answer
When the amplifier  don't have ground but it is still on it needs to find ground
the only place was to get it from the rca jacks ,because of this the radio got damage and now there is no ground on the rca jacks coming out of the radio
the radio needs to be repair
good luck