Originally Posted by line6man
Active pickups have a low output impedance. When resistance goes down, the frequency cutoff goes up, so increasing the capacitance shifts it back down. That's why higher values work with active pickups. Those values will turn everything to mud with passive pickups, however.
Exactly true. Which is why the thing to do is simply TRY tone caps until you get the sound you like. You can just tack them in quick with solder to try them. And when you find the value you like you can do a more permanent job.
Personally when I can't decide, I go with TB: Have the ALL!
This is why my favorite circuit for a passive Jazz bass is to add a on-off-on switch that goes between ,o15, none, and ,047 ufd. That way I can get as bright as the bass goes (none) or switch to some preset tone in either the standard value .047 or a lighter tone (.015) which I like sometimes.
Would work for your actives too, though the values will probably be different.