INV 2462 The Pro Co DB-1 is a popular passive direct box designed to connect unbalanced musical instruments, line-level sources, and guitar amplifier outputs to low-Z balanced microphone inputs for PA or recording. Here are some key features: Inputs/Outputs: It has a 1/4" input and a parallel 1/4" output, along with a male XLR-type balanced mic-level output. Switches: Includes switches for speaker/line-level attenuation, high-cut filter, and ground lift. Design: Known for its simple and reliable design, making it easy to use in various environments.