I have a question about my factory subs in a 03 LS V8. I had two JL subs n amp hooked up to the factory subs n amp in back with factory 6 disc. The problem is I think I blew one or both factory subs because one or both is making some kind of weird popping sound if the bass is turned up enough and if it starts to do it and i turn the car off it makes a loud gurgling type sound. Just wondering what people's thoughts were because I finally have the money to fix them.