Radial Pro48, Active DI Box, Radial Item R800 1105. The Pro48 is an active direct box designed for use on stage or in home recording studios, with exceptional signal handling for use with both active and passive instruments. Its internal switching power supply significantly increases headroom, producing less distortion while yielding a smooth, linear response that extends from 20Hz to well above 40kHz. This results in natural, uncoloured signal that is as good or better than DI boxes costing several times more. The superior performance makes the Pro48 an ideal candidate for use with battery powered active basses and acoustic guitars that tend to overload other direct boxes. ??High performance active direct box ??Increased dynamic range and headroom ??No batteries required, works with phantom-power ??Ideal for acoustic guitar and bass ??Ultra-flat frequency response with extended highs