The Realist Bass Transducer is a piezo-electric film transducer that mounts under one foot of the bridge. The close coupling with the body produces a natural sound which responds well to both pizz and bow.
Ned Steinberger and David Gage developed this design. Fits under one foot of the bridge with the 1/4" phone jack mounted invisibly under the tail piece. This system produces a natural, woody tone. It already has compensated for standard amplifier input impedance and needs no preamp!