Radial Engineering PRODI Single Channel Passive Direct BoxRadial Engineering ProDI overview The ProDI from Radial Engineering is a high quality, single channel, ultra compact passive direct box, specifically developed to allow regional sound companies and project studios access to the quality of a Radial direct box at a more affordable price point. The ProDI is a great choice for bass and acoustic guitar. The unit features a custom made transformer that is able to handle high levels without saturation and