Hi all.......I'm thinking about modifying my '01 MIA Jazz bass and would like to know if the combination of EMG-J pickups and a J-Retro preamp would work well. Since both the pickups and preamp are active, could both run off the same 9v battery? With this setup I suppose I would not be able to take advantage of the passive mode on the J-Retro if the battery died (since the EMG's run off a battery, too)? Would the battery life of this active pickup/active preamp combination be shorter than compared to using passive pickups with the J-Retro? It sounds like most J-Retro fans are using passive pickups.......perhaps this is the best of both worlds? My goal is to have a Jazz bass that can cover a lot of tonal territory - I like to play everything from Funk to R&B to Blues to Jazz. I've read good things about DiMarzio Ultra Jazz pickups. Would these be a better fit with the J-Retro?