The Finest DI on the Market - Unbelievable Tube Tone The number of A-Designs REDDI's in use on stages and studios all over the world is nothing short of staggering. Quite simply, there just is no better sounding way to convert an instrument or line level signal to XLR. Designed with the help of top studio engineers and bass players, REDDI has been widely praised by engineers and bassists all over the world as the best-sounding DI solution on the market today.