Older style (beltclip) sadowsky outboard preamp. New style ones goes for $239. This has the same sound, just not all of the outputs, etc. Increase low end clarity and tightens the the highs nicely on passive basses. $115 shipped and I'll throw in a new set of bass strings 105-45s No trades except toward a fulltone bassdrive or perhaps a high end bass chorus pedal. Price is firm. References available.