Radial Pro DI Direct BoxProDI Passive Direct BoxPart No. R800 1100 Compact passive direct box for stage and studio Able to handle huge transients without distortion Transformer isolation eliminates noisy ground loops Plug and play easy to use feature set on stage or in the studio The Radial ProDI is a passive direct box that combines exceptional audio performance with solid dependable construction, making it the ideal general duty direct box for stage and studio. The heart