Radial ProDI Passive Direct BoxThe ProDI is a passive direct box designed for use on stage or in home recording studios, with the ability to handle high output instruments without distortion, and a transformer isolated output to eliminate noise from ground loops. The heart of the ProDI is a custom wound Radial transformer. It features an exceptionally high 140k input impedance to reduce loading while enabling the ProDI to handle extreme signal levels at all frequencies without