Seymour Duncan Active Bass Preamp System (STC-3A) (3-Band for Active Pickups)We offer a high headroom, low noise, 3 band (STC 3A) active onboard EQ preamp for use with active pickups. Each active bass preamp comes with high quality potentiometers on a pre wired harness, battery clip, and knurled black dome style knobs. Our Tone Circuits will add a tremendous amount of on board tonal versatility to any dual pickup bass. This design enables players to boost or cut specifically focused frequencies in order to achieve signature