This is one of the real problems with SACD and DVD Audio.
If your player does not have bass management and\or a digital link, you may be sending full range signals to ALL of your speakers (including your sub) via the analog outputs.
Not a good thing.
You will find a good article written here at Audioholics on the subject.
http://www.audioholics.com/techtips/specsformats/DVD-AudioSACD12.php
That is why I have been waiting for Denon to make a univeral player with DenonLink, that costs less than the 3910.
I may have to wait until they release a HD\universal player.
I am hoping CES will release news that will be music to my ears.