Hi all, im actually very alarmed by what im hearing and need ocau's audiophile guidance. My Audio Setup is AD700's and Xonar Essence STX. I've lent the STX to a friend and im using onboard for the first time in a million years. I just re-installed my computer with vista, loaded up the latest Realtek HD Audio drivers and installed foobar2000 and played from John Mayer Flacs and ... It sounds exactly the same. I don't understand what's happening, Realtek has somehow because extremely good or my STX wasnt ever performing. I was extremely happy with the music and gaming performance of my STX + AD700 but listening to AD700 + onboard...its exactly the same Now, im not an audio expert and am not 100% what to be listening out for but listening with an open mind and open and non-biased ears, they sound the same, maybe slightly different. What's going on?