but I actually play jazz and piano on my speakers, thru midi synthesis. Smaller bookshelves cannot handle the load + bandwidth of this type of signal at high (peak) volumes, which jazz has tons of. I'm running a 2.0 setup consisting of Klipsch THX ultra 2 KL-650s for the mains (no sub--yet) powered by an Emotiva XPA-3 (hugely important, it made the audio quality leapfrog what I was using before, which is a NAD amp that now serves as analog pre-amp).
I play all the jazz .flacs from my computer via analog outs off my Asus Xonar DX sound card that has a 116 db S/N ratio with very low noise floor. I might try to eliminate the preamp entirely but I don't trust windows very much. There's always random youtube and flash ads that are waaay louder all of a sudden. Anyway, for Jazz my 2.0 setup rocks, very neutral but powerful. Handles everything I throw at it, including Pianoteq which I pound relentlessly. The amp really helps with this. The built-in amp of my NAD didn't cut the mustard.
my $0.02. listen to all the speakers you can, and if you want to know where to get a great price shipped on the klipsch just PM me. I got them unheard after being not too impressed by the lack of relative value of other things I listened to, based on glowing reviews from basically everyone. Horn speakers are great for well, horns. Saxes are super smooth, piano, bass, percussions - everything sounds huge, controlled, effortless, and above all very musical without being tiring in the slightest. All the fortes of jazz music for listening long hours.