You got the hd600?
You'd want to use the fiio l7, which is an adaptor to bypass the built in amp in the fiio e7. Then it'll work fine and you'll use the e7 purely as DAC, which you can feed into the magni.
Cool.. So what exactly is the point of the mini USB port on the L7? I actually sketched my future "set-up" so I could grasp it fully, but i'm not seeing what the point of the port is, unless just for charging?
So it's: Source (my phone) to L7 via 3.5 to 3.5, L7 to EO7K by the hdmi look alike port, then a 3.5 from one of the E07K's headphone ports to RCA in order to connect the Magni. From there just plug in the 600's?
Btw, I don't have the 600's. Didn't want to buy expensive cans when I'd know I wasn't getting the most from them. But, now that I have a slight idea of a set-up, I'll reconsider.