Here we have an Aguilar OBP-1 (two-band) preamp. This particular Aguilar has a unique configuration that was custom-wired. It is: V/Blend/stacked Treble-Bass/Passive tone w/ push pull As far as I can tell, the passive tone only works when pulled up (bass in passive mode.) Pretty handy feature. It comes on a plate, pre-wired with traditional Jazz bass style plastic knobs. One thing to note: the blend knob has something wedged into the set screw and I wasn't able to remove the set screw to take the knob off. So that knob is pretty much staying there - I didn't want to force it or try to damage it to get the knob off. So as long as you're cool w/ Jazz style plastic knobs, no big deal. To order a similar pre-wired preamp from BestBassGear (without the passive tone since they don't even offer that) would be $185. Not counting the cost of knobs and the plate. I'm asking $115 shipped or best offer for the pre-wired plate w/ knobs (everything pictured.) Lower 48 USA only, no trades.