HDR HDMI TRUE MATRIX 2X4 – THE TWO OPTICAL OUTPUT PORTS AND THE TWO AUX OUTPUT PORTS HAVE THE SAME OUTPUT CONTENT AS THE TWO HDMI OUTPUT PORTS. TWO GROUPS OF AUDIO EDID MODE SETTINGS ARE ASSOCIATED WITH TWO HDMI INPUT PORTS. THE GROUP1 IS ASSOCIATED WITH HDMI IN1, AND GROUP2 IS ASSOCIATED WITH HDMI IN2. BEFORE USING ARC, MAKE SURE YOUR TV HDMI PODRT SUPPORTS ARC AND THE ARC HAVE BEEN TURNED ON. WHEN THE ARC FUNCTION IS TURNED ON, ARC AUDIO IS OUTPUT FROM THE OPTICAL PORTS, WHILE AUX PORT HAS NO OUTPUT AT THIS TIME. AUX HAS OUTPUT ONLY WHEN THE AUDIO FORMAT IS LPCM. THEREFORE WHEN USING AUX OUTPUT SIGNAL, IT IS RECOMMENDED TO CHOSE EDIT MODE IN 2CH MODE.