Seeing as a Jazz bass (like almost any bass) can be used for just about any style of music, you are going to get as many answers as there are different amps and none of those answers is going to be much use to you at all.
What sort of music do you play? What's the amp for - home practice, small gigs, or what? Is your Jazz bass passive or active? Do you want a combo or a head + cab? What sort of size and power are you after? What sort of bass sounds do you like? Are you going to buy new or used? Are you planning on keeping it long or reselling soon to upgrade? Do you prefer modern or vintage style tones/design? Is weight an important consideration? Do you plug straight in or use any effects? Do you want to do any recording? If so, DI from the amp, or with a mic? What amps have you tried in the past and what did you think of them? Et cetera.
Last edited by bassybill : 12-28-2012 at 06:02 PM.