Prestige Stereo - Questions Still

[Nick Danger]

I've been reading page after page of past threads and can't find an answer to something I find puzzeling. I just bought an '05 Aero with the Prestige 13-speaker stereo. The thing I find wierd is that there doesn't seem to be any sound coming from the rear of the car. Even when I adjust the fade to all rear, it's barely audible. I checked the fuse for the amp and it is good. The sound from the front is not all that bad, but there just isn't any depth to the overall sound because of nothing coming from the rear. Is this normal or is there something else that I need to check out?

Thanks for any help.