The Carl Martin 3-Band Parametric Pre-Amp Pedal was designed with pickup-equipped acoustic instruments in mind. Whether you play acoustic guitar violin double bass or accordion the 3-Band Parametric Pre-Amp has the high-quality EQ and balanced line drive that you ve been searching for. The 3-Band Parametric Pre-Amp features a portable stompbox design allowing you to leave that cumbersome 19 rack pre-amp at home. The 3-Band Parametric Pre-Amp is perfect for performing on the stage or recording in the studio and works equally well with electric guitars electric basses and other electronic instruments. Now with DC input this pedal can be used with any 9V DC 200mA power supply center negative. No battery operation. Get your Carl Martin 3-Band Parametric Pre-Amp Pedal today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.