Oh I expected it to be bad, just wondered how bad you thought it was :P. I wouldn't be buying 1000+ dollars worth of gear if I thought the E17 was enough haha. Infact the drive ability listed on Fiio's website for the E17 is 150 ohms.... so the lower frequency part of the HD800 impedence curve that is at 600ohms must be pretty pathedic. I use an E17 for my HD598's and that's fine... it'll be fun to plug the 598's into the soloist SL/concero actually, see if they scale up at all.
Or if I ever use them again after my HD800s.
Haha yeah. It's mediocre at best, but truthfully and for the money that FiiO e 17 is a beautiful DAC/Amp for the $$. Pair this with audio technical Ath-m50 headphones and you've got the best sound for your money. Awesome pairing. I got the M-50's a couple of days ago. Guess I better add that to my inventory list. Lol!
Also. You will use those other headphones still! At first, and these are just my findings. The HD 800's take some getting used to, especially during burn in time. They are quite sharp and bright in some areas mainly treble and sibilance, but with the right DAC and proper burn in time it will level out and be much warmer. You'll probably listen to 2 or 3 albums and then Give your ears a break. They are awesome but once you get used to them they are ethereal. The Burson is so balanced, so you will be maxing out the HD's potential for dynamics. Live recordings will sound like studio recordings. Lol