A matching transformer, 600 Ohm to 10K Ohm. Used with AMT-600 Line Driver or AMT/R-600 Line Driver/Receiver in conjunction with transmitting audio over fiber optics or telephone wire. The TR-2 matches the 600 Ohm output of the transmission (fiber optics, etc.) and produces an output of 10K Ohms for input to the Louroe Base Station.