High headroom, low-noise, 2-Band active onboard EQ preamp voiced specifically for fretless basses with PASSIVE pickups Designed to be used with passive pickups, this version of our Tone Circuits will add a tremendous amount of on-board tonal versatility to any dual passive pickup bass. Our design enables players to boost or cut specifically focused frequencies in order to achieve signature tones and to dial in a great sound no matter what the situation. The STC-2PSB provides bass and treble controls, a master volume, a blend control, and our special frequency contour switch. This preamp was voiced by Steve Bailey to have two bands of focused EQ, together with a switch that engages a frequency contour optimized to bring out fretless harmonics as well as mid-range boost.