What is an ARC?
ARC is from English Audio Recovery Channel, or an audio recovery channel, and works so that televisions, computers or any other medium-sized radio can send audio content to play on an external device. For example, if we watch a Netflix series on television and want it to be heard on an external audio device instead of the TV speakers themselves, we'll use the port. HDMI ARC
As a general rule, on a TV or medium audio device we will find this port clearly identified.
Prior to the arrival of the ARC level, an analog or optical cable (TOSLINK, S / PDIF) must be used to transmit digital audio streaming between the TV and the audio device (which can be an amplifier, sound bar, 5.1 Home Theater system, etc.), and requires fewer RCA cables. Audio Return Channel (ARC) limit this to a single HDMI cable, which means that in one thread we will be sending video and audio information in a bidirectional way.
What is eARC?
EARC is adding the "Improved" name to the sound return channel, as well the difference between the ARC and the eARC it belongs to him alone bandwidth. This means that it is able to send and receive a lot of data at once, allowing you to enjoy the sound of Stround as well as formats such as Dolby Atmos and DTS: X, in addition to many other advanced functions. Due to ARC restrictions, this is only possible when using the EARC interface.
Here you can see the difference.
Finally, you should know that if your television or stereo has HDMI 2.1 signal, it is probably compatible with EARC even if it doesn't, because this technology is used correctly with this HDMI version (but be careful because you will need an HDMI cable that supports Ethernet). Also EARC backs up with ARC, so even if the external speakers do not have eARC, it can work on the appearance of the eARC HDMI interface, as well as the remaining cable.
