# HDMI ARC vs eARC: What Changes and Who Actually Needs eARC Source: https://hometheatersetuphub.com/blog/hdmi-arc-vs-earc Published: 2026-10-01 Publisher: Home Theater Setup Hub ARC and eARC both send sound from your TV back down an HDMI cable to a soundbar or AV receiver, so one cable handles audio for everything plugged into the TV. The difference is capacity: ARC is limited to stereo and compressed 5.1 formats, while eARC has enough bandwidth for lossless Dolby TrueHD, DTS-HD Master Audio and uncompressed 7.1. If you mostly stream, ARC is usually enough. If you play 4K Blu-ray discs or game on a console through the TV and own a system that can decode lossless audio, eARC is the one that delivers the full soundtrack. ## What ARC and eARC actually do Before ARC, a TV needed a separate optical cable to get sound from its built-in apps and tuner to a sound system. Audio Return Channel, introduced with HDMI 1.4 in 2009, reversed the direction of audio on one HDMI port so the same cable that carries video to the TV can also carry the TV's audio back to a soundbar or receiver. Enhanced Audio Return Channel arrived with the HDMI 2.1 specification in 2017 and does the same job with far more bandwidth, roughly 37 Mbps against about 1 Mbps for ARC. Both features live on a specific HDMI port. On the TV it is labeled ARC or eARC, and most TVs have only one such port. On the soundbar or receiver it is the HDMI output, usually marked HDMI OUT (ARC) or (eARC). Both ends must support eARC for it to work. If one side is ARC only, the link falls back to ARC and its limits. ## Audio formats: where ARC stops and eARC continues ARC reliably carries stereo PCM, Dolby Digital 5.1 and DTS 5.1. Many TVs also pass Dolby Digital Plus over ARC, and that matters because Dolby Digital Plus can carry Dolby Atmos in its compressed, streaming form. ARC cannot carry Dolby TrueHD, DTS-HD Master Audio or multichannel uncompressed PCM. When a source sends one of those, the TV either converts it to plain Dolby Digital 5.1, drops to stereo, or outputs nothing. eARC carries everything ARC does plus uncompressed 5.1 and 7.1 PCM, Dolby TrueHD, DTS-HD Master Audio, and the lossless versions of Dolby Atmos and DTS:X that ride on top of those formats. In practice that is every audio format found on a 4K Blu-ray disc or output by a current game console. An optical connection sits at about the same level as basic ARC: stereo PCM, Dolby Digital 5.1 and DTS 5.1, with no Dolby Digital Plus and no Atmos. If your soundbar has only optical and ARC, ARC is the better of the two whenever the TV can send Dolby Digital Plus. [See optical cables for gear without ARC](https://hometheatersetuphub.com/best/best-optical-cables) ## When plain ARC is enough Streaming services deliver surround sound and Atmos as Dolby Digital Plus, not as a lossless track. If your TV passes Dolby Digital Plus through its ARC port, an Atmos soundbar connected by ARC will show Atmos from the TV's own Netflix, Disney+ or Prime Video apps. For a household that streams nearly everything, eARC brings no audible change in that case. ARC is also all you can use with a stereo soundbar, a 2.1 bar, or a 5.1 system that only decodes Dolby Digital and DTS. Those systems have no decoder for TrueHD or DTS-HD, so extra bandwidth would go unused. Check the format list in your soundbar's manual before treating a missing eARC port as a problem. [Compare soundbars by connection type](https://hometheatersetuphub.com/best/best-soundbars) ## When you need eARC The clear case is a disc player or console plugged into the TV, with the TV feeding a capable sound system. A 4K Blu-ray carries its main soundtrack as Dolby TrueHD or DTS-HD Master Audio, often with Atmos or DTS:X. Over ARC the TV cannot pass those tracks, so you hear a compressed 5.1 core or a downmix. Over eARC the full lossless track reaches the receiver or soundbar untouched. Game consoles are the second case. A PlayStation 5 sends uncompressed multichannel PCM by default, and Xbox consoles offer uncompressed 5.1 and 7.1 as an output option. A TV limited to ARC cannot forward 5.1 or 7.1 PCM, so the sound often collapses to stereo unless you switch the console to Dolby Digital or DTS bitstream output. With eARC the PCM signal passes straight through. There is one workaround that avoids the question entirely: plug the player or console into an HDMI input on the AV receiver or soundbar instead of the TV. The audio is decoded before the signal ever reaches the TV. The catch is that the receiver or soundbar must pass the video features you care about, such as 4K at 120Hz, VRR and Dolby Vision. If it cannot, connecting sources to the TV and returning audio over eARC is the cleaner route. [See AV receivers with eARC](https://hometheatersetuphub.com/best/best-av-receivers) ## Cables and ports: what eARC requires ARC works over practically any HDMI cable made in the last decade. eARC uses the cable's Ethernet channel wires to carry its higher-bandwidth audio, so it needs a High Speed HDMI cable with Ethernet or an Ultra High Speed HDMI cable. Most High Speed cables sold in recent years include the Ethernet channel, but an old or very thin cable is a common reason eARC refuses to connect while ARC works. If you are buying a cable anyway, an Ultra High Speed certified cable covers eARC and the full 48 Gbps video features of HDMI 2.1 in one purchase. For the short run between a TV and a soundbar, 3 to 6 feet is typical and there is no benefit in paying for length you do not need. eARC has two further practical advantages. It uses its own data channel to let the TV and audio device identify each other, so it does not depend on HDMI-CEC being switched on the way ARC often does. It also makes lip sync correction mandatory, so the TV and audio device exchange delay information automatically. With ARC that correction is optional and you may need to set an audio delay by hand. [Find an HDMI cable that supports eARC](https://hometheatersetuphub.com/best/best-hdmi-cables) ## How to check and turn on eARC First look at the labels. The TV's eARC port is printed as eARC or eARC/ARC next to one HDMI input, and that is the port the soundbar or receiver must use. Then open the TV's sound settings: most brands have an eARC mode set to Auto or On, plus a digital audio output format that should be set to Passthrough, Auto or Bitstream rather than PCM. On the source device, select bitstream or leave the audio output on its automatic setting. To confirm it is working, play a disc or a game with a lossless or uncompressed track and read the format shown on the receiver's display or in the soundbar's app. Dolby TrueHD, DTS-HD MA, Atmos with TrueHD, or Multichannel PCM means eARC is active. If you only ever see Dolby Digital or Dolby Digital Plus, the link has fallen back to ARC: recheck the eARC setting on both devices, the port, and the cable. ## Frequently asked questions Can I get Dolby Atmos over regular ARC? Yes, in its streaming form. Atmos from streaming apps is carried inside Dolby Digital Plus, which many TVs pass over ARC. Lossless Atmos from a 4K Blu-ray rides on Dolby TrueHD, and that needs eARC or a direct connection from the player to the receiver or soundbar. Do I need a new HDMI cable for eARC? Not always. A High Speed HDMI cable with Ethernet works, and so does any Ultra High Speed cable. If eARC will not engage and the settings are correct on both ends, swapping in a certified Ultra High Speed cable is the cheapest thing to try. Will an eARC soundbar work with an ARC-only TV? Yes. The two devices fall back to ARC, so you get stereo, Dolby Digital 5.1, DTS 5.1 and, if the TV supports it, Dolby Digital Plus. You lose only the lossless formats. Is eARC better than optical? Yes. Optical tops out at compressed 5.1 and cannot carry Dolby Digital Plus, Atmos or any lossless format. Use optical only when a TV or audio device has no ARC or eARC port. ## Related buying guides - https://hometheatersetuphub.com/best/best-soundbars - https://hometheatersetuphub.com/best/best-av-receivers - https://hometheatersetuphub.com/best/best-hdmi-cables - https://hometheatersetuphub.com/best/best-4k-blu-ray-players - https://hometheatersetuphub.com/best/best-optical-cables