Radial Engineering R8001100 ProDI Passive Direct Box

The Radial ProDI is a professional-grade passive direct box built for engineers and musicians who need reliable, transparent signal conversion from instrument-level to mic-level without coloration or noise. At its core is a custom-wound Radial transformer that provides clean signal handling even with high-output sources, while simultaneously offering galvanic isolation that eliminates the ground loop hum that plagues many live sound and studio setups. With a high input impedance of 140k ohms, the ProDI reduces loading effects on instrument pickups, preserving the natural tone and dynamics of the source.

Built around a 14-gauge steel I-beam skeleton, the ProDI is engineered to survive the rigors of touring and daily stage use. Its plug-and-play simplicity makes it equally at home in a studio rack or on a pedalboard. The compact form factor keeps it unobtrusive on stage, while the XLR output and 1/4-inch thru jack provide flexible routing to both the front-of-house console and an on-stage amplifier. For working professionals who value reliability and sonic transparency over feature count, the ProDI delivers exactly what is needed and nothing that is not.