So, I'm running the Beyerdynamic DT 990 with the objective 2 amp. No DAC. I get this static/buzzing/electric sound, not sure how else to describe it, at different volumes for different songs. Sometimes I hear it at 50% volume, sometimes 80%ish. (never really go beyond that, too loud. I have it set to low gain mode, since I heard gain should be as low as possible. (and I never go above 80% even at that) So, whats causing it? Bad recordings? No DAC? Do I just have to live with this?