I get this from Fiio
Dear Duy Dang ,
Thanks for your mail and support to FiiO!
Kindly inform you that, our amps E17, E12 and E11 have no ability to block DC offset from being amped.
We think if you connect your mod ipod to E11, E17 or E12, you will face the risk of damaging amplifier and your headphone. We don't suggest to do so.
If you have any other question, please feel free to contact us!
Have a nice day! ^_^
FiiO Customer Service