Glai
Don't get me wrong the 805 sigs IMO are a great speaker, second on my list of the speakers I have owned.
I listen to jazz, classical, old rock. The f688 do all types of music very well, there mid range really is second to none (that i have heard anyway). I find the f688 to pull you into the music, 3d sound stage, amazing imaging. There are songs where you can actually hear that the singer is sitting at the piano, A little to the left of center and lower (seated position. I have had friends come over and show me their goose bumps after listening to a track from Norah jones and many other artists.
the sound from the 805 sig IMO are more separated, no musical flow or involving pace. Also the 805 sigs do not do rock music very well, probably because they are so acurrate.
Philnyc Hope you are right, I can't wait to get my focus f688 back... they really are second to none
best wishes
Jason