Yes, you generally need an Ultra High Speed HDMI cable (HDMI 2.1) for the best and most reliable eARC performance, as it supports the necessary high bandwidth (up to 37 Mbps) for high-quality audio formats. While some existing "High-Speed HDMI cables with Ethernet" may work, an HDMI 2.1 cable ensures full compatibility with all features. Sonos +5
ARC is compatible with HDMI versions 1.4 and above. Most HDMI cables available today are at least compatible with version 2.0. The latest version of HDMI is 2.1, which can pass the highest bandwidth yet. It also supports the enhanced version of ARC: eARC.
What cable do you need for HDMI eARC? You don't necessarily need a special cable for HDMI eARC, though a High-Speed HDMI cable or an Ultra High Speed HDMI cable is probably a good bet. The latter option is sure to work, as the Ultra High Speed specifications support all HDMI 2.1 features.
eARC (or (Enhanced Audio Return Channel) builds on this technology, leveraging the increased bandwidth of HDMI 2.1 to support a wider range of audio formats as well as expanded features such as automatically correcting processor delays so that your audio and video always match, as well as lip sync correction.
All HDMI ports can carry video and audio, but they support different bandwidth levels, which determine the devices you should use with them. If you happen to plug into the wrong HDMI port, nothing will break, but you will not get full performance or sound.
Some new TVs support 8K resolution. To be able to display all those pixels, you need HDMI 2.1 to have sufficient bandwidth. This is also why you need HDMI 2.1 to view 4K 120Hz content. High refresh rate like this is mostly beneficial for gaming, as movies and TV shows are played back at a maximum of 60Hz.
You're in luck — all you need is a single HDMI cable to connect your TV and soundbar enabled with Dolby Atmos (HDMI 2.0 for ARC should do the trick while HDMI 2.1 is necessary for eARC setups). This is the simplest option and will send audio directly from your TV to your soundbar.
There are no HDMI cables specifically for eARC, but only HDMI 2.1 cables fully support HDMI eARC, so if your cable is an HDMI 2.1 cable, it should support eARC without issue.
Which cable do you need for HDMI ARC? HDMI ARC is compatible with HDMI 1.4 cables and all later versions.
Only supports compressed sound, not the best quality audio. Works with older TVs and sound systems that don't have HDMI ARC. Needs a separate cable for video, not as simple as HDMI.
Sometimes, cables will also have resolutions like 4K or 8K printed on them. If it's 8K, you likely have an HDMI 2.1 cable, and in such cases, it should support eARC as long as you connect it to compatible displays and devices. The only way to confirm if you have a cable compatible with eARC is to test it.
However, your current cables probably can. If, in the future, you buy an HDMI 2.1-compatible TV and an HDMI 2.1-compatible sound bar, your current High Speed cables should be able to transmit eARC. Audio doesn't require the bandwidth that video does.
HDMI cable
Most soundbars and TVs have an HDMI port. Keep in mind you need to use an HDMI ARC or eARC cable and port. If you don't have this, you'll need an optical cable in addition to an HDMI cable. With an HDMI 2.0b cable, you can transmit the sound of your television to your soundbar.
It's also important to note that while all eARC devices are HDMI 2.1 compatible, not all HDMI 2.1 devices support eARC. This means that if you want to enjoy the benefits of eARC, you need to make sure that both your audio device and TV support eARC.
HDMI 2.2 represents a similar kind of overkill. There aren't any 10K TVs in stores, never mind ones with 12 or 16K resolution. More importantly, there isn't the faintest hint of one shipping in the next several years. Major brands like LG, TCL, and Sony have actually retreated from the 8K market.
HDMI 2.0 offers ARC (Audio Return Channel), which is fine for most users, but HDMI 2.1 introduces eARC, essential for those who want the best with high-fidelity formats like Dolby TrueHD and DTS:X.
ARC only makes a difference if you want to hook up a sound system, sound bar, etc to the TV via HDMI so the sound can go to the sound device. Otherwise makes no difference.
While Standard or High Speed HDMI cables can transmit audio, limitations or a decrease in audio quality may occur if you connect a soundbar or home theater system to a playback device that supports eARC, and you want to play high-quality audio formats such as Dolby Atmos, Dolby TrueHD, DTS HD Master Audio, etc.
eARC (Enhanced Audio Return Channel)
Will this work with any HDMI cable? Both Ultra HDMI Cables are designed to support the new eARC feature in addition to the highest resolution video modes. The Standard HDMI Cable with Ethernet and the High Speed HDMI Cable with Ethernet will also support eARC.
In summary, eARC provides significant improvements over ARC, especially in terms of audio quality and format support, making it a better choice for audiophiles and those seeking the best possible home theater experience.
Enhanced Audio Return Channel (eARC) is another major upgrade in HDMI 2.1, improving audio transmission between your TV and sound system. HDMI 2.0 (ARC): Supports compressed audio formats. HDMI 2.1 (eARC): Supports high-bitrate audio like Dolby Atmos and DTS:X, delivering immersive surround sound.
Enhanced Audio Return Channel (eARC): HDMI 2.1 produces eARC, supporting advanced audio formats like Dolby Atmos and DTS. This gives you a more immersive audio experience and also offers an improved lip-sync performance and audio quality compared to the standard ARC.
Comparing Dolby 7.1 and 4K Atmos
Dolby 7.1 provides a traditional surround sound setup, ideal for larger rooms, whereas 4K Atmos combines stunning visual clarity with immersive audio, pushing the boundaries of home entertainment.
At 1080p (1920×1080), HDMI 2.0 typically has enough bandwidth to handle 240Hz. This is why most 240Hz gaming monitors that rely on HDMI 2.0 are designed to run at Full HD, where the connection can remain stable and fully compliant. The situation changes significantly at higher resolutions.