I have Focusrite Scarlet 8i6 soundcard. Btw recently I bought AKG quincy jones q701 headphones. But my soundcard did not drive my headphones well. Then I just bought a headphone amp. Now I am going to wire my own cables for between soundcard (2 x 1/4" mono) and headphones amp (2 x Rca mono)...

I have a guitar processor (Line6 Pocket pod). And I use it with my akg k240s headphone. Pocket Pod manufacturer (Line6) advices headphones in 150-600 ohm range. But my headphone is akg k240s and its 55 ohm. I have serious problems with my headphone and this auido source (pocket pod guitar...