Zen Can was a little bigger and heavier than i thought. Good thing. I have Hifiman Sundaras running out of a FIIO M11 balanced port. Using Amazon Prime Music HD, Ultra HD as music. I like it loud, but believe me the planas need to be loud to appreciate image and detail. I was at 70% high gain on m11, with Zen M11 is on low gain , Zen at 50 % but on 3 gain. Running balanced, I’ve used some EQ on my M11 to my liking and it seems to match the xbass & 3D on Zen, when I use 1 or both, very subtle but better. The plug connections are very firm, at first it didn’t work until I realized I hadn’t pushed the balanced input hard enough to connect, a good thing, like the firm construction. Very happy. Couldn’t find a 4.4 to 4.4 to connect from Zen to M11, had to buy 4.4 to 2.5 female & 2.5 male to 4.4 balanced cable. Works fine.