You can do better than just loading Audirvana Plus onto your Mac. That's kind of like buying a record player with whatever cartridge it comes with. As stated above, there's more to be done to get the most out of computer audio.
Macbook w/ Audirvana vs. CD playback
I just downloaded Audirvana Plus (free 15 day trial) and compared CD's ripped to my MacBook Pro against the same CD's played through my Rotel deck. MacBook Pro w/ Audirvana Plus > Belkin Gold USB cable > Emotiva XDA-2 DAC > AQ King Cobra IC > Rogue amp vs. CD's into Rotel RCD-1072 > MIT coaxial digital cable > Emotiva XDA-2 DAC > AQ King Cobra IC > Rogue amp. My ears are pretty good at hearing subtle differences in the quality of the sound of music, but I cannot hear any significant differences between the two. Is it just me, or do you guys and gals have the same reaction ? I'm curious as to what you think.