I do not want to put 4 batteries in the cavity of my bass.. What the hell is going on? I just got my system used to the 18v pre amp. OK>>>> Here is my question!! Is there a way to power your pickups from an outboard source? If so, anysuggestions as to who makes them and where to get them? I really hate to have to think about 4 batteries in my bass and then having them all go out in the middle of a show, because I forgot again to change them.