I personally turn Crystalizer and Bass enhancement off. I find all the Crystalizer does is just boost the sound (isn't that what the volume nob is for?). And the Bass adds unwanted extra bass in certain music/sounds where either the musicians or developers did not intend there to be any. Again just adjust the bass on your sub to the desired level. I only keep the Surround setting on. I know you pay as part of buying the Sound Blaster for these enhancements, but the value is still there over onboard audio with them off as the Z still has great clarity and overall quality without them.