Carl Martin 3 Band Parametric Preamp Designed for use with acoustic instruments such as guitar, violin, and harmonica Real 3-band parametric EQ Balanced line driver Integrated regulated power supply XLR and 1/4" outputs These instruments sometimes use combo amps, which require a high-quality EQ (3-band parametric) and balanced line driver These features have been integrated into a convenient stompbox format with both XLR and 1/4" outputs The Carl Martin Parametric EQ/Pre-amp also works well for tweaking the sound of electric guitars, basses, and other electronic instruments in the studio Integrated regulated power supply