Bartolini NTMB preamp and pots
I had this installed in a bass that I ultimately decided to revert to passive.
Bartolini NTMB 3 band preamp, 9V or 18V. Professionally installed and uninstalled, wires were never cut. It's currently wired with the pots I used:
1) MEC 3-way stack with volume/blend and push-pull for active/passive. This pot alone sells for $80!
2) Mid control with push/pull boost.
3) Treble/bass stack
A girl asked me what bass players do in the band since there's already a guitarist. I said "You know how cheerleaders do that human pyramid thing? Well, we're the fat chicks on the bottom."