Sonifex RB-SM2 Dual Stereo to Mono ConverterThe RB SM2 is a dual version of the RB SM1, consisting 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 20k 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.