The E11 barely drives my DT880 Pro's, I would seriously look into the C&C BH amp for a few bucks more 300mW of output will drive the 250Ω for sure.
Check this thread here:
Really? I'm not someone who destroys his ears through very loud music :-) normally, I listen music at a normal level... I just prefer a good sound, like deep bass, nice treble and stuff.
As an example: my ears began to hurt when I put the Fiio's volume up to 2, with my Sennheiser HD439 (32 ohm) and even with Koss PortaPro (60Ohm)
Have you changed the Fiio's option to "high-impedance"? I think there's a button or something like this on the right side, next to the bass-equaliser.
Edited by Nati123 - 2/13/13 at 10:25pm