The HD800 with the proper source and amp is not jaw-dropping, You will
not climb the drapes and swing from the chandelier from sheer gear
excitement. These wonderful cans will not create drama in your life.
I have been using them for almost two years with an Off-Ramp 5, a Berkeley
Alpha, and first a Zana Deux and now a Leben CS-300. They are not super
hi-fi. They do not exaggerate or call attention to themselves. They give you
music so it sounds like music. If there is drama it is the drama of the music.
My system is put together to do that, and the Leben is better than the
ZD in this regard.
The Leben also drives a pair of Rosinante Signatures--wonderful, little
known speakers--that I preferred to Devore 9s, hearing them side by side.
the HD800 is some more neutral than Rosinantes.
I hope you like the Senns. They are not for everyone.