Designed for buffering/blending of piezo signal for use with magnetic pickups. Also used to get the piezo signal up to good levels even when magenetic pickups are not employed.
Bartolini recommends the MPB2-918 for use on bass. Known to work well with Bartolini, Aguilar, East, & other preamps.
Blend pot included.
This unit can be used in conjunction with any of the Hipshot Piezo bridges