The RB-SL2 is a stereo VCA limiter, or independent dual mono, designed for use in press areas and other locations where the correct level to recording equipment is required, but not necessarily under engineer control, for example, for overload protection. It can also be used as an economical main output limiter for small radio stations, hospital radios and student radios.

The balanced XLR-3 inputs and outputs can be wired unbalanced to accept consumer equipment output.

For each channel, there is an input gain and threshold level control. With the limiting threshold set to maximum, the input to output can be normalized using the input potentiometers. Once the unit acts as a buffer with gain/attenuation, the limit threshold level can be set, with recovery time adjusted for the application. The power LED indicates limiting by flashing.

The mode switch on the rear panel allows switching the unit from dual mono to stereo mode, where only channel 1 (left) presets are active and apply to both channels. Stereo limiting works by limiting left and right outputs if either left or right input needs to be limited. Dual mono limiting works by limiting left and right signals individually, so you can use the RB-SL2 as two separate mono limiters.