I am using an RME sound card with great luck. Sound quality is top notch. It is driving 30' XLR cables into mono tube amps with out a problem. I have gone every popular sound card route with no luck. Switched back to a DAC and pre or awhile then read enough to know that the RME Lynx or Appogee was where I needed to be. The difference is like when I upgraded to a Rowland preamp years ago. Eye opening.
Pc Based Preamp
Looking for quick info on a decent pc based preamp for audio