Hi I have a Fiio E9 amp with E7 DAC. I am looking to buy some good open back headphones for music and especially gaming. I was looking at the Beyerdynamic DT 880 Premium 600 ohm but am unsure whether I have enough amp power to drive these well - 600ohm is the highest impedance I think I've seen. Can you advise me on this issue? Are there any other high impedance full size open backed headphones around the £200 mark you would also recommend? Regards Mag P.s. I apologise if you are already answering this - I posted a "contact us" query on Friday - but have just noticed you have an extensive forum as well so have signed up.