This is my experience only:
My SB2 has a pretty boomy bottom. I turn down the boost on my GK 800RB amp to zero and just work with the volume knob, with everything else at 12 o'clock position. I've tried my darnest to have it somewhere close to sounding like a Fender Jazz, but to no avail. It will not provide you with clear glassy highs. It's not much of a bass for slapping. The downward slap sounds powerful, but the plucking just got no crunch nor snap, especially when compared to a Jazz. If you look at SB2 as a successor to a Precision, you'll be a lot more content. Most players treat the P-style pickup as the primary pickup and use the J-style to further shape their sound. Some players suggest the reverse, which also works. The tricky part is to solo the J-style pickup. That's when you need some amp EQ tinkering. You definitely need to turn the boost back up to like 10 - 11 o'clock position if the J is the be soloed. There will be pickup hum when J is soloed. If the set-up is optimal, the J soloed can provide you with a rich, upper-midrangy sound.
