Oppo 203 setup/tweaks

I auditioned then purchased an Oppo UDP 203 having had the BDP 105 for some years.  I first resolved that the Digital Filter setting was critical for best audio performance  that setting being the 5th, super slow (roll-off rate).  I have found setup/tweeks to be very important in maximizing performance and would like to get personal experiences specific to this player where improvements were made.