OK bear with me here guys... Now this may sound like a stupid question but... a bass with passive pickups will NOT have a compaprtment in the back of the bass correct? Where as a bass with active pickup will.. ? Or is it that active pickups are only on basses with some kind of switch either in a knob or on the body of the bass itself...... even if it does have a compartment for a battery? I am leaning towards my first assessment.. but I am not quite sure.. so I am asking. I currently play a Ibanez SR505 ... and I have to put a battery in it... so is that considered "active" .. I was in GC this afternoon drooling over a MTD bass.. and this one had the BOOST push/pull knob.. is that active as well? My 77 Jazz is passive... yes? Just trying to wrap my head around this as I am shopping for a new bass... and I see some basses... like my SR505 linked above... yet nowhere in the writeup does it say "Active PU".. Hence my inquiry to clarify things in my own head.