The RB-SM1 consists of a converter which will produce a fully buffered and balanced mono line output from a single stereo input. All connections are on the rear panel. The XLR-3 input is electronically balanced with an impedance of 20kOhm bridging. It can be wired unbalanced to accept an output from domestic equipment. The XLR-3 line output is electronically balanced with an output impedance of <50 Ohm. The output can be wired unbalanced by grounding the non-phase signal, allowing you to feed balanced and unbalanced equipment. Output gain adjustment using pre-set potentiometers allows a normalised mono output from domestic stereo equipment.