Hey guys, I want to thank you guys all for helping my earlier questions about which pickups...I decided to go active with some EMG P's. But now I'm interested in hooking it up with an OBP-1 preamp. Right now I already have a 9 volt in there for my EMG Pups and that takes up all my room under my pickguard (MIM Fender Pbass) so I assume Im going to need a battery box or something to stash my batteries. From what I read, the OBP requires 18 volts...so I was wondering would I just need to add an additional battery making it two batteries, or make it a total of three batteries? So what I'm asking is that...do I or should I get a battery box? Or could I just rout a little more underneath my pickguard. Or if the battery box is a better solution, should I go have it professionally done or do it myself (and how?) Thanks for your help guys and I look forward to hearing from you.