just put an SEB2-APA+ in my Ibanez and the difference is huge. the stock preamp in this thing was attenuating the signal so much i had to crank it which amplified noise. now finally i have a bass that i like to play and the tone doesn't suck! top front knob is blend, next to it is active/passive and volume. bottom are active bass/treble and passive tone (i know they make a 5 pot version but i had this in another bass and just wanted to try it). wow these pickups actually sound really nice on passive and the hissing noise that has plagued me for years is almost gone! not sure what to do with these extra holes. maybe i can install a clip to hold accessories like the piece of exercise mat foam i use as a string mute or my spider capo 
as per my other post i just capped off the "tap" wires from the pickups
as per my other post i just capped off the "tap" wires from the pickups
