All, I've got a fretless Carvin LB75. It's all Koa, neck, sides, and all, and has the bridge humbucking pickup with the neck J. Both active. It's a pretty nice bass, but boy does it sound dark. Maybe a little tubby on the neck pickup too. Has anybody experimented with replacement pickups that fit Carvin 5-strings? I'd like to find something that gives me a bit more hi-fi sounding upper midrange and maybe a bit brighter. Suggestions apprectiated.