Hey I have a question. Not a 7 stringer, but I have a Jackson that has stock passive HZs in and I have to say that I absolutely LOATHE the sound of. Way too muddy and flabby for my tastes. (I have to max out the treble of my B-52 LS-100 to get a decent tone) I wanna know if possible, if I can throw at least an 81x in there. But I'm not sure where to put the battery, and/or how to install them. Any advice for me?