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Thread Starter 

So, here's the deal.

I own the PSB M4U2 headphones with a built-in amp. I then bought an Asus Xonar U7 external DAC/amp, thinking I could get better audio quality (Right now I'm using a port in my keyboard, sounds terrible). I got the Xonar today, but noticed a buzzing sound, stemming from ground loops. I had never heard of this until today. 

What do I do now? I want a DAC/amp (Basically I just want better sound) for around 100-150 $ (Prefferably around 100 €, as I'm based in Europe). I dropped 400 $ on some sweet headphones, but I've got nothing to back it up.

I was looking at the E-MU 0204 E-MU 0204 USB it says it has ground lifts. Would that resolve the problem? Are there any alternatives?