Some people claim that their DAC (in whatever form it is connected or build or whatever) sounds better if they up-convert to the max the DAC can accept, and that's w/o using any ("DSP") effect.
If you use the room correction on top of that it may very well give you better overall results especially if you have a difficult room in my experience why many lightening's room are quite square (nearly same size for the two walls) and that will give standing waves.(if distance to ceiling is near the same length as for the walls you really could have a problem).
Room correction together with damping (thick carpet etc.) can give you very good results.
The issue I am bringing up in this forum in my other post is nothing compared to what a bad room can do.
So I suggest you give it a try activating one thing after another when playing uncompressed music (ex.from a ripped CD), give your self good time to find out if your latest settings really makes the sound better + if you own or can borrow some highend and/or revealing headphones you can make the first settings with them to ensure a good foundation before making the room correction. (better cheap relatively revealing phones like ex. Roland RH25 than no phones)
If you can get rew to work that is a nice tool (and cheap tool) so you don't make room correction only by ears, you will maybe need them to fine tune after rew.
But be warned it can be difficult to get rew to work.
http://www.hometheatershack.com/forums/rew-forum/11707-room-eq-wizard-rew-information-index-links-guides-technical-articles-please-read.html