Rear speaker buzz with engine on.

[waynne]

Since I fitted my radio there is an annoying buzz from one of the rear speaker but only when the engine is running. Any ideas what causes this, with the engine off everything is fine. If I play a CD, FM or DAB the buzz is still present when the engine is running.

Could it be a supression issue? Is the speaker faulty? Could it be a bad earth contact? Any ideas how I can track the fault down.

[ascaudio]

is this speaker amplified or just head unit
if its amped the rca leads are to close to the power cables some where . if it isnt check the earth on the head unit make a new one short as possible and clean up the metal it goes to

[waynne]

Its just a head unit. I will check the earth connection and see if that fixes it. Many thanks for the help asc.

[ascaudio]

welcome