Good luck with your decision. You can run things that require 4. (Makers like Sennheiser ,AKG, and yes Beyerdynamic) Headphones competing of àt this level this could set you back twice as much as the T90. I was expecting richer mids to give the highs something to float on but that didnt seem to happen. I tried a couple of my extra after market cords and none worked. If you are considering these shoes, Id definitely recommend purchasing here on Amazon so you can get free returns if needed. I have since ordered 4 pair of these in different colors, and I gave them to almost every person I know for Christmas. Got this as protection on my purchase but I dont get how it works. These 5?s are very Superior to the 2?s, but they are MUCH more expensive. If you dont have these jacks, you might find a single mini jack, or some other jack that says "AUDIO OUT".