The RB-UL4 is a 1U rack-mount quad stereo unit for interfacing domestic, or semi-pro unbalanced equipment to professional balanced line levels.
The eight RCA unbalanced inputs have an impedance of 10k ohms and are routed to four balanced
XLR-3 outputs with an output impedance of <50 ohms.
The output gain can be individually adjusted for left and right channels by using pre-set
potentiometers accessible through the rear panel.