Does anyone else hear a constant background noise from the speakers when the car is in the on position even with the audio system off? It is quite noticeable with the engine and fan off. I have the base 8 speakers audio system.

 

I have the Tech model so I'm not sure about the base model, but there is a very very low ground hum noise that I can hear when the car is parked and in my garage, but the signal to noise ratio is so low I never hear it when I'm driving. Do you hear it when your driving?