The RB-SM2 consists of two independent converters which will produce two fully buffered and balanced mono line outputs from two stereo inputs. All connections are on the rear panel. The XLR-3 inputs are electronically balanced with an impedance of 20kOhm bridging. These can be wired unbalanced to accept an output from domestic equipment. The XLR-3 line outputs are electronically balanced with an output impedance of <50 Ohm. The outputs can be wired unbalanced by grounding the non-phase signal, allowing you to feed balanced and unbalanced