Let me rephrase the question or questions to be more accurate.. Please on chime in with on either of these. What bass and/or bass pickup in the bridge pickup position, delivers the fattest and punchiest Jaco-like tone? I'm not actually looking for an exact Jaco tone. I want something that's fatter and fuller and yet punchy in a bridge pickup. Of the many basses I've played, the G&L L2500 has the closest sound with the rear pickup soloed. Also any opinions on any overall bass combo that would deliver this tone...i.e. Delano humbucker on a basswood body???