I am not sure if I have a problem. When I change the front/rear fader to full rear, I cannot hear the rear speakers from the driver's position, they are so weak. I hear some residual sound from the front speakers, very little from rear. The volume must be turned up very far to get a normal sound level, even a rear passenger would have trouble hearing them. There is definitely sound coming from the rear speakers, but very low. At the same volume level, when I switch back to the front speakers, I am blown out of the car with high volume. Any other Premium owners experiencing this, or do I have a defective system?