I have been trying to decide between the Creative Titanium HD or Xonar DX, if I used a digital connection (s/PDIF) then does it mean it won't matter which card I pick because with digital connections the sound will be the same no matter what card I choose? Is this true? Because I have a 5.1 speaker system and the TitanHD doesn't support analog connection for 5.1 speakers.
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When you use the digital connection, the OS and sound card's drivers will do SOME audio processing, but for the most part, the component at the other end of the audio chain that does the conversion to analog will be the primary driver of sound quality.