I'm a newbie with some onboard preamp questions. If you've got a nice bass and decent head, what's the point of active electronics or an onboard preamp other than logistics? I mean, can a 2 or 3 band OBP really shape your sound as well as your head's preamp. Can it offer up a much different tone? I'm talking about heads in the $800-2000 range (ashdown, iAmp, swr, eden, etc.). Or is the voicing radical enough to give you a different sound? Also, do head-integrated preamps give a signal boost like active onboard electronics? Thanks for the education.