I installed a new Kenwood double din receiver in my 2003 G35 Sedan. Now when the radio is on I get a buzz in the RH front door speaker and tweeter. I checked 4 grounds inside the car. They looked fine except the one under the drivers side dash by the steering column had some minor surface corrosion where the ground attaches. I don't think it was enough to cause the issue. I disconnected the speakers so I can listen to the radio at least. All the other speakers in the car sound fine and don't buzz. Just the RH front and tweeter. Looking for help or guidance.

 

 

 

Swap that speaker to the other side and see if it works over there, if so then you have a wiring issue, if not then you have a blown speaker.