Erikzen, I use my Xp7 with my beloved Panasonic SL-SW870 discman and the sinergy is outstanding with my Sennheiser HD590. The bass is killer, the mids flow wonderfully and the highs are very precise without being fatiguing at all. Consider that the Ad797 are tad smoother on the treble than the Ad825s but the bass is clearer and defined, it is just perfect. Additionally the Equinox cable bring the Senns to a new dimension, the highs are very "accurate" and the music sounds fuller.
I usually listen to progressive rock, blues and hard rock, but sometimes I like smooth jazz. However, keep in mind that I'm very picky on the recordings. If it doesn't sound right to me, I just don't listen to it.
If you have the chance, check Kansas LEFTOVERTURE, Joe Louis Walker IN THE MORNING (Telarc-Blues), Ayreon THE HUMAN EQUATION (Progressive),IQ SUBTERRANEA (prog), Peter Cincotti (s/t and On The Moon/ smooth mainstream jazz), any of the Govt Mule (blues rock), Allman Brothers HITTIN THE NOTE, Deus Ex machina CINQUE (prog jazz rock), Dave Gruisin HOMAGE TO DUKE (jazz), there are just a few examples of what I consider good sounding cds without being TRUE audiophile recordings.