Hi,
I just found this on Head-Fi:
http://www.head-fi.org/forums/f103/bang-olufsen-a8-mod-343057/
Maybe someone remembers, I had problems with having almost no Bass when listening to my A8's. I have very narrow ear canals so most earphones won't fit properly -> less isolation -> less bass
Now I tuned my A8's like the person in the Head-Fi thread suggested and guess what, it works!