The Para Acoustic D.I. is a studio-quality direct box, featuring a five-band equalizer with tunable notch and midrange controls, adjustable gain and phase inversion. The proprietary Quasi-Passive EQ circuitry is totally transparent and allows control over voicing without sacrificing tone - a big advance over conventional equalizers. In short, the Para D.I. Is engineered to bring out the best in any pickup. The Para D.I. is an excellent preamp for almost any playing situation. It can be used with passive pickups or active systems, and works well with a wide range of instruments including guitars, violins, mandolins, and basses.