my SSI have Bartolini on it, preamp is aguilar OBP-3, sounds.....so normal, the normal could be good....I think, they aren't as hifi as EMG(No hi fi), not like bassline also, just like a "mic", the special thing is, they are fine in headphone, sounds great in live.....they are humbuckin...I think!
Never try other pickup on SSI, the size seem to be special, or I would like to try EMG or MEC...
I heard Bassline before, I like Bartolini better, bigger tone! I will stay on Bartolini or MEC if the pickup come with the bass, or I will change it.
Maybe the "normal" tone is "vintage"....too hard for a Taiwanese...
Joe