4-channel professional quality passive direct box for connection of unbalancedmusical instruments and line-level sources to low-Z balanced microphone inputsfor PA or recording. Each channel features 1 front-panel and 2 rear-panel 1/4"(6.35mm) jacks for input or parallel ouput, switches for line-level attenuation and ground lift, and front-panel male XLR-type output. Uses Pro Co DBT-1 transformers (20k/150Ω).