One thing you might want to be careful about is the volumes set for things like windows (if using a PC) sounds. I ran a DAC via USB from my computer directly into my amps for a while. The windows sounds were often very loud (at start-up). You'll want to disable some of them. In addition, I use Winamp as a media player and sometimes the scroll wheel on the mouse adjusts the volume. I didn't have a huge problem with it, but I worried about someone unfamiliar with the program/my system accidentally cranking the volume and blowing a couple drivers. I added a true preamp and don't worry about it anymore. More expensive, but worth the piece of mind for me.