The atlona at uhd m2c bal is an audio converter used to extract and downmix multi channel digital dolby and dts surround sound signals from hdmi sources to balanced analog signals for professional audio systems the converter provides controls for one or two channel mode volume mute bass and treble via rs 232 tcpip and a web based gui a balanced analog audio output is provided on a 5 pin captive screw connector the video pass through design of the at uhd m2c bal allows it to be placed