One solution to the bass management problems in these players is to upgrade to a player that has digital output for SACD and DVDA. Digital outputs for these formats include: firewire (IEEE 1394 or iLink), Denon Link III, HDMI version 2 for SACD or version 1 for DVDA.
It its too bad that players with these outputs are usually more than $700 US.
I am lucky enough to have the Denon DVD-2930 (Denon link III) with the AVR-4806. This is one smokin' combination for SACD and DVDAs.

maphiker