Please forgive me, I'm trying my best to follow along.

Is it *possible* that the XBox as the source is the problem for DVD's? Is there a chance you can try your setup with another (stand-alone) DVD player and see if the results are different?

Are there adjustable output settings on an XBox? Seems like you're only having trouble with DVD's, so perhaps it is the DVD player rather than the speakers or the receiver.

bibere usque ad hilaritatem