hartke amps not really my thing though... a personal preference kind of thing. the same reason i hate DR strings.
though one reason could be that i play a jazz bass that has a maple top, dimarzio pups, and stainless steel strings. to me alum cones reproduce frequencies so well (especially highs) that it sounds too hi-fi for my taste. in my situation an alum cone speaker is simply overkill, unless i'm going for stu hamm's tone (who happens to endorse hartke amps).
in a live situation tone still matters. maybe in terms of 0.0001db boost/cut it doesnt, but say for a jazz bass, different pup balances make a world of a difference. the 2 single coil pups on a bass surely have a purpose other than just to cancel out 60 cycle hum. alot of music uses generic bass tones, but if you play genres as diverse as reggae, punk rock and disco, tone matters a great deal.
it is especially true in a live setting, as it matters what the other instruments in your band are playing; how much distortion the guitarists use, how much of his kit your drummer uses... which could mean the difference between being too outstanding or drowned out. and it is important that you observe these details, because the layman will not know what's up with the band, all they will know is "this band sounds bad"
in fact i just got back from a studio using a hartke combo... and with my rig it was somehow equally as bright no matter what i did with the tone knob on my bass