This is a brand new Audere 3 band Jazz preamp, completely wired and ready to drop into almost any Jazz Bass by simply removing the existing plate and putting this in it's place. Connect it to the pickups, install a battery, and you're ready to go. I bought this preamp for a bass that was being painted but by the time I got the bass back I had already acquired another active Jazz Bass, so I decided to leave it passive and never used this preamp. The only difference from stock is that I painted the set screws white, makes it much easier to see the knob setting on stage. I've had these preamps in a number of different basses and still have one in my Lakland DJ4, and they are stellar. When the controls are set flat you get the pure passive sound of the pickups, no coloration at all. Roll on the Bass, Mid, or Treble control and you get anything from subtle boost or cut, to insane tonal extremes. Unlike many preamps I've tried, the Audere is very organic sounding, nothing harsh or electronic sounding about it. Audere ships these with a 3db boost to the gain, meaning when it's run flat your bass sounds the same as passive, but louder. But there are also adjustable gain pots on the circuit board so you can use those to set the output truly flat, boost it a LOT, or cut it. I find the 3db boost it comes with to be perfect. Here's the details: Jazz 3B Black $80 including FedEx shipping in USA. Paypal only please.