There is a topic about Dolby Headphone settings. I just posted there my most recent settings.
http://www.head-fi.org/t/555263/foobar2000-dolby-headphone-config-comment-discuss/705#post_10268257
I agree with Dreyka:
Well I don't know HD800 how they sound,but I know Alpha Dogs. On Alphas music straight from CD is very enjoyable, but because tracks are not binaural you still fell this super-stereo effect which is tiring. You can solve the problem by simulating that sound is incoming from speakers that are in front of you. If you do that you may indeed hear sound like on speakers, but the problem with speakers is that sound is coming only from the front, and you would like to hear something from back as well - at least some echo or something to make you feel the dimension of the stage. Apparently there is Dolby Pro Logic which can convert any stereo into 5 channel audio. In theory it works only with material recorded in PL format (BTW I have a few CD's which actually are). However in practice you can still use that technique when listening to any stereo recording. The thing with all PL surround effects is that they are predefined, and you can't change their internal parameters. So I came up with Matrix, that will do the decoding. First I got coefficients for PL, and then tweaked them to be more for music listening, i.e. to be useful with normal stereo rather than PL records only.
Some people may say that any DSP will devastate the sound quality. I would agree that better SQ would be if recording was binaural from the beginning, but we all know that is not going to happen. So how much does the DSP destroy the sound. I have noticed that adding effects very much blurs the sound when listening on cheaper headphones. But for example with Alpha Dog it is just impossible not to hear every single detail. So I guess much depends on gear - with better gear DSP is not a problem.