I recently upgraded my bass with Nordstrand Big Singles and actually like them a lot better without the preamp in passive mode. Therefore, I am thinking about nixing the premp completely and installing a passive system. My idea is to have a series paralell switch on each pickup and volume/volume/tone. Basically I am wanting to wire it like a jazz bass but with series/paralell switches on each pickup (since I have 5 holes to deal with). Does anyone have a schematic for this type of setup? Also, what type of switches would I get and where could I get them from? I'm excited about this but don't know how to do it so any ideas would be much appreciated. Thanks!