Ever since I simultaneously had my bass set up, replaced the (broken) speakers in my cabs, and got a new preamp (mmm... Kern), my low B string has been sounding weak. Because so much changed at once it's been tricky to diagnose the problem, but now I think I've figured it out. (Background: I play a Carvin fretless 6 string with a bridge humbucker.) One of the problems I had fixed when I sent my bass to be adjusted was that the B string would rattle against the fingerboard in certain positions. The fix for this meant raising the B string, so now the string is (roughly) the same distance from the pickups as the other strings, but that's farther from the pickups than it used to be. Does this mean that the B string is supposed to be closer to the pickups than the other strings? I've also read that Carvin pickups are not wide enough for 6 strings. Indeed, the relative weakness of the B string is much more noticeable on the narrower bridge pickup than on the wider neck humbucker. What do you guys think? I just need my bass set up properly, or I need new pickups? Thanks!