What type of music?! There's deep bass that is just a tone (electronic bass), and then there's deep bass produced by an instrument that actually has nuance and defines an instrument in space with attack, and sustain. The latter is far more difficult to reproduce well. The closest thing I listen to of the former is some of Radiohead's newer stuff like Amnesiac. That is some pretty challenging material for a system to stay on top of. On a cut like, "Pack'd Like Sardines", the meters stay largely in overload for most of the song (and yes, the bass does get very deep at times). Going to the latter, more difficult kind of bass to reproduce, here are a few suggestions:
Pop music (or rather alt-pop-folk or whatever category you want to try to stuff her into): Joanna Newsom, The Milk-Eye'd Mendor (try "The Book of Right-On")
Classical: Gary Karr, Harmon Lewis - Adagio D’Albinoni (a bit hard to find, but gorgeous - use the title cut)
Jazz: Vassilis Tsabropoulos, "Achirana" - Try the cut "The Spell"
Drums: Trio Chemirani, "Qalam Kar" (astounding soundstaging, great drumming throughout the CD)
Classical: Copland, "Fanfare for the Common Man", Eiji Oue & Minnesota Orchestra (again, use the title cut)
Pop (piano): Tori Amos, "God" EP, "All the Girls Hate Her" (reproducing a large piano in realistic terms is very challenging - this piece is short and sweet...just Tori's Bosendorfer which has an extra octave on the low end).