what are they whats the difference in sound and price and which is better or is it all opinion? i have no clue about this. ive seen basses with batteries in em is that active or passive? mine doesnt have a battery and if it does it is not visible so what kind of pickups do i have? and also, on an amp i am lookin for it got 2 inputs -15db and 0db i think? whats the diff in them? ok i think i asked everything so thanks to all who reply.