De-Emp and Direct Which to Use


On my DAC, there are two outputs set: De-Emp and Direct. Which I should use? and What is the pro/con of each. Thank you for any advise.
atranz
Most DACs switch automatically from regular to DE-EMP if the cd was recorded with EMP! If you switch in the DE-EMP with regular CDs, you will be rolling off the HF.