Bass guitar wasn't sounding too good through the Church PA. Seeing John's (website) recommendation, we swapped out our current DI for the Radial - just a simple A vs B comparison. Well, the Radial was such an obvious improvement that everyone at the practice heard the difference. Bass is now sounding both full and detailed. We're now swapping out the rest of our DI's for these ProD2's. (You have half as many boxes on stage and get a helpful discount, pro rata, to the ProD1.) Thanks again for your good advice, John.