Rep Power: 738

I was at an alignment shop last friday and the guy who was doing my car said he heard some "feedback" coming from my system, and he said something about the ground wire. What does this mean? Feedback is?

right now I have a 10" polk mm104 sub with a 350w alpine amp hooked to my stock HU.

Also this box is sliding around when I make turn how can I make it stable? I tried velcro but the adhesive just rips off the bottom of the box.

Thanks!

 
Rep Power: 738

it think he means the whinning buzz or when the amp turns on and you get a popping
noise from the sub....its most likely the ground

 
Rep Power: 738

Does it damage anything?

 
Rep Power: 738

it could quite possibly damage your amp

 
Rep Power: 738

Okay. Im gonna take out me rear seat and take a look at the ground contact with the car.