i am trying to figure out why my girlfriend's aftermarket stereo is making a weird ringing noise. It's a constant noise that comes out of 1 or 2 speakers. She has the bose system, but replaced the head unit with a new one. Please help..cuz it bugs. I have no idea what's going on...i installed 1600 dollars worth of equipment in my car, but i don't what's wrong with her deck. thanks..

 

Did she replace speakers as well? You have to get an adapter if you don't change everything together. Check the FAQs