SM Pro Audio"s Q-DI gives you four totally independent DI Box units in 1/2 RU package. The Q-DI has received a major revision in terms of appearance and performance. Upgraded to include SM Pro Audio"s E-Series circuit design improvements, the Q-DI delivers high-quality audio in a stylish compact format.This E-Series circuit design, component selection, and manufacturing offer an additional level of quality to the already successful DI4V.The SM Pro Audio Q-DI line mixer is housed in a stylish extruded aluminium external chassis that can be rackmounted using SM Pro Audio"s RM-1 single unit rackmount adaptor. One unit can be mounted in the center of the rack, or two units side by side. Robust connectors are provided for all inputs and outputs.