what is going on with my subwoofer?

having an issue with my sub. I took it out to work on the interior of my car, it was out for about a month. I put it back and nothing, turns out the small fuses on the amp were all blown (but not my 60 amp fuse that I wired inline 10cm before the amp connections). So I replaced the fuses and now whenever a big hit of bass comes, my subs start going nuts indefinitely (as seen in the video here http://www.youtube.com/watch?v=9jRzdiLVwwM ) , the only way to stop them is to turn the bass down. Any thoughts? Hope my amp is blown... My setup is: 2X Alpine Type R 12" JL J2-500.1 Amp

Sounds like the gain got pumped all the way up (assuming there is nothing wrong with your speaker wiring.)  Turn the gain all the way down and reset it to the proper level and see if this helps.Support the12volt.com

Do you have a Pioneer radio?   Or are you using a line out converter to provide signal to the amp?   Is it a Honda?

i am an idiot wrote:    Or are you using a line out converter to provide signal to the amp?

how would a loc affect the quality of sub bass? im just wondering1000 watts of lp, now need sum hp an mids

A line out converter wired to the speakers that are located within the trunk of the vehicle (The same space occupied by the subs) is not a good idea, especially in a Honda. I have no idea what kind of vehicle he has, but trust me, it can be his problem.

sthrnbmpn wrote: i am an idiot wrote:    Or are you using a line out converter to provide signal to the amp?   how would a loc affect the quality of sub bass? im just wondering

Its not quality as much as feedback, when the LOC is connected to the speakers in the same space as the subs, any movement of the speaker cones generates a signal that is input into the sub amp.  Its a REAL problem when the amp has a signal sensing turn on.

as to the OP, I think you may have a ground issue. Try shorting the ground on the RCA to the main ground on the amp and see if it stops acting wierd.