So I'm looking into entering the world of hi-end headphones but I am kindof a noob. After hearing a setup that one of my friends has, I have decided to purchase a pair of Sennheiser HD650s and a Woo Audio WA3 amp with built in preamp (I'm getting a great deal on the amp, $400). However, I don't really have room in my budget to purchase a dedicated DAC as well. Will the DAC on my Xonar STX sound card be sufficient for my setup, or is it absolutely necessary to buy myself a dedicated DAC? Thanks in a advance for the help.
Also, if anyone has other suggestions as to my headphone or amp choice, I am all ears. I listen mostly to rock, jazz, metal, techno, and the occasional hip hop. My source will be FLAC files from my computer primarily.








