First, let me reply that, as I noted, there was no serious attempt to do a side by side comparison as they are in different rooms, in vastly different setups, and used for different applications. That said, running my VCR through the 5.1 setup where the TV is, where the 563 is, not running tapes, but simply a pass through of the on air signal produces considerably more bass than does use of a DVD through the 563A. There is certainly deep bass reproduced by the 563A, only at a much lower level. I will attempt in the next week or two to swap the players and see the results. In the meantime, my question is have you lived with both players and run them or simply auditioned them in the store? What is the basis for your conclusion that both players provide very flat bass response? I am always open to the opinions of others, and so am curious as to where it comes form.
Marc
Marc