Noise coming from passenger rear speakers on new car

Did it start making noise from day one ? Did you test drive it ? When I bought my one year old Latitude, all the sales dude wanted to do was talk during the test drive. He even turned on the radio to show everything off. I turned off the radio and politely said, "No talking until we're done.". Then I listened, windows up. Then one window down at a time. Shook the steering wheel, listening. Listened for the brakes. On the way back to the dealership I said, "Now you can do your salesman thing.". And boy did he. Preventing a salesman from talking is like trying to tell a 5 yr old to not talk in church.