My Ibanez BTB has passive pickups, with an active EQ (preamp also?). My John Myung 6 has active pickups, active EQ/preamp. I have a passive 5 string pup for a bass I'm building (found one after posting my "cheap 5 pup" thread), and I'm wondering if it would be possible to add an EQ to it. My BTB shows me that it is possible to combine passive w/ an EQ, but are there any considerations/requirements? Is there actually a difference between a passive and active pickup? Or does the difference lie after the pickup, where you start adding things like the volume/tone pots, etc?