Steelseries GameDac + Beyerdynamic DT 990 Pro 250 Ohm. I currently have the Arctis Pro + Gamedac and was wondering how well the Gamedac will work with the Beyerdynamic DT 990 Pro (250 Ohm). I am looking at selling the Arctis Pro headset and keep the gamedac for the new headphones (audio quality just isn't there).