I'm pretty new to the world of audiophile-grade sound components, so I have a few questions about what this thing actually is. I already know that I need a converter and an amplifier to create the sound that goes into my headphones, but is the DAC2 an amplifier? If it is, should I go with that or get a separate amp as well? Also, I've had a sound card in my PC in the past, so would this take the place of it? Any information about this would be greatly appreciated.