my advise is not to use any DSP and keep alll the equalizers flat, if u have a good audio system, the sound output from the foobar2000 is better than any other else, ofcourse u can use the noise sharpning or the X-fi crystalizer for low quality audio files, personnaly i dont like the x-fi crystalizer wich boast that it can upsample a 16 audio stream to 24 bit and by that it can increase sound detail, wich is not mathematically possible cuz the details in the 16 bit audio will be the same on the 24 bit one or less because of the entrophy.