Hdmi arc is sometimes active only for over the air broadcast and if the tv is a smart tv its internally accessible streaming sources. It has the potential to simplify setup but it comes at a potential cost.

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Hdmi arc connection diagram. By using the arc connection for audio and the hdmi cec functionality this should be enabled on your tv by default you can reduce both the number of cables used and the number of remote controls. The hdmi specification. In setup 1 mentioned above youd connect all your sources to the sound bar and just run the one cable to the tv. Most samsung tvs support the hdmi feature called audio return channelhdmi arc is designed to reduce the amount of cables between your tv and an external home theatre system or soundbar. With hdmi arc the audio signal is capable of travelling both ways to and from the speakers which will improve the sound quality and latency of the signalreally it just means you dont need a second optical. A tv manufacturer may only provide hdmi arc to pass two channel audio while in other cases both two channel and an undecoded dolby digital bitstreams may be included.
Arc or audio return channel is an hdmi feature built into many tvs receivers and sound bars. Heres what you need to. Again note the arc label on the hdmi connection that would connect to the tv. There are a number of hdmi standard cable connectors available each of which can be used for any uncompressed tv or pc video format including standard enhanced high definition and 3d video signals compressed or uncompressed digital audio cec consumer electronics control connection and an ethernet data connection. If you have the audio from your blu ray disc or dvd player connected to the tv instead.