Mine are connected to the top audio port too.
trothad...what is" Idk"???
I believe that DVDRey,has nailed the problem..when I listen to some older recording in my itunes library,I crank up volume to 80-90%,however,when I'm just listening to internet radio {iheart radio} a level of 40-50% is fine.
I have a Fiio e10 amp,being delivered today,so,I'll post back,to let you know how it works out.
One thing,or,maybe its just me,but I've been using these headphones on & off,for the last 8 hours,and the sound quality seems to be improving,especially in some of my jazz selections,the detail & separation of these speakers is amazing.
Another thing,they are extremely comfortable....they feel extremely lite.
One peeve though ..Sennheiser could have at least supplied a casing,or at minumum,a felt bag to keep dust out,when not in use.
At $250.00 ,this is not asking too much.
Thanks to all you guys who posted back on all my questions,I'm new to Head-Fi....this is a great forum.