I'm told by Mike Lull that Paul Chandler designed that pick up for them, based on a '60s Gibson - What I know is that as a single pup bass these are fantastic, simple instuments for esp good for rock, the set neck tightens the tone up some over a standard Gibson and it sounds great played fingerstyle or with a pick. As value vs $$$ goes these are really hard to beat, the QC is real good and it's very study, really a work horse bass.