Aha, makes for a interesting experiment!peterleroux wrote: It's mostly to answer this question that I'm giving it a try.
Apparently the position and construction both have a lot to do with tone- some people say that a MM pup in the P-bass position sounds more like a precision than a Stingray. I'm going to move it around and see. One of the things is that an active circuit can compensate for the loss of warmth you get when moving closer to the bridge- apparently the Stingray circuit was tweaked with the position of the pickup in mind, to compensate for the shortcomings of the tone.
You said "MM" pup, that's a mighty mite pup? It also crossed my mind that the active circuit could mask some of the tonal changes one would get from moving the pup around.
Keep us updated please - quite curious! I've got a old Hofner (missing the original pup) that I need to drop another pup into (Probably a P Bass passive, if I can find a reasonable one).