TB member Passinwind designed a really interesting and great sounding filter based preamp and made it available as a DIY project if you’re handy with a soldering iron. I put one together but put it in a box rather than install it in a bass so I could try it with a variety of basses I own. My only mistake was I took it to a gig of sorts and promptly had it stolen. So I guess I wasn’t the only person who really liked what it could do.
I’ve got the parts and another board so I’ll build myself a second one eventually. Figure I’ll put it in my Spector fiver this time around. The circuit really does work some magic with a 5-string.
Project is in the TB wiki if you’re interested. Link
here.