Furman HR-2 Remote Headphone Mixer Drives Two Pair Headphones Connected to HA-6AB or SP-20AB Furman HR-2 Headphone Remote Stations are passive devices intended for use with the Furman HA-6AB Headphone/Monitor Amplifier, to increase the number of headphone stations beyond the six provided, and/or to locate them more conveniently. May also be used with Furman SP-20A Half Rack 20 Watt/channel Power Amplifier. Connects to HA-6AB or SP-20AB with standard XLR mic cable