Any of you guys driving open-backed full sized cans straight from the AK240? Been thinking of getting a set to compliment my (C)IEMs, but I don't want to fall back down into the rabbit hole of amping and stacking - not to mention building a desktop rig that'll never see any use. I'm looking at the Philips Fidelio X2 as a cheap way to get my open-backed fix and they should be very easy to drive. But then there's the HD700... I could probably stretch my budget to a used set of those if I wait a little, but I wonder if the AK240 will be able to drive them properly on its own.
I'm don't drive headphones direct from the AK. I wouldn't effort anything beyond IEMs and super efficient headphones (under 32 ohms).
I attach a Chord Hugo via lightpipe. The Chord has more than enough to drive most open backed cans-- and you might consider a Mojo, a much cheaper sibling to the Hugo. Both are nicely portable.