HDMI ARC stands for Audio Return Channel, and it solves a specific problem: getting sound from apps running on a smart TV back out to a soundbar or AV receiver, using the same HDMI cable that already connects the two devices. Before ARC existed, that meant running a separate optical or analog audio cable alongside the HDMI cable. ARC folded that second cable into the first.
What changed in 2026
- eARC is now common enough that plain ARC feels dated on new receivers and soundbars, though ARC remains standard on budget TVs and older-but-still-common devices, so understanding both is still necessary.
- More streaming happens through TV-native apps, which increased how often ARC or eARC actually gets used, since audio from a built-in streaming app has nowhere else to go but back out through the TV.
- Setup got a little more forgiving, with more TVs auto-detecting ARC-capable devices and prompting to enable it, though manual HDMI-CEC or ARC toggles in the settings menu are still sometimes required.
How HDMI ARC actually works
Standard HDMI carries audio and video from a source, like a streaming box, to a display. ARC adds a return path over that same physical cable so the TV can send audio the other direction, out to a soundbar or receiver. This matters specifically for audio that originates on the TV itself: a built-in app like a smart TV's native streaming platform, or the TV's own tuner, has no other route to your sound system without ARC.
The catch is bandwidth. ARC's return channel does not carry as much data as a full HDMI video connection, which limits it to compressed surround formats like standard Dolby Digital. It cannot pass higher-bandwidth formats such as Dolby Atmos in its uncompressed, object-based form; that requires eARC. Our HDMI eARC explainer covers that distinction in detail.
ARC versus the alternatives
| Connection |
Carries lossless Atmos |
Extra cable needed |
Typical use case |
| HDMI ARC |
No (compressed only) |
No |
Budget TV plus soundbar |
| HDMI eARC |
Yes |
No |
Newer TV plus receiver or premium soundbar |
| Optical (TOSLINK) |
No |
Yes |
Older TVs without ARC support |
| Direct HDMI from source |
Yes, if source and receiver support it |
No |
Source connected straight to receiver, not through the TV |
Setting it up correctly
Both devices need a port specifically labeled ARC or eARC; plugging into a regular HDMI input on either end will not work, even though the cable looks identical. Most TVs also need HDMI-CEC enabled, since ARC negotiation relies on it. If sound is not passing through after connecting to the right ports, checking that CEC, sometimes branded differently per TV maker, is switched on resolves the majority of ARC problems.
Common mistakes
Using the wrong HDMI port. Only one port on most TVs supports ARC, usually labeled "HDMI (ARC)" or "HDMI 2 (ARC)" in the manual.
Assuming a soundbar without ARC support can use any HDMI cable. The cable is not the limitation; the port and the device's internal support for the ARC protocol are.
Not checking cable quality on longer runs. ARC generally works over standard HDMI cables, but a cheap or damaged cable can cause intermittent audio dropouts that look like a device problem.
FAQ
Do I need a special HDMI cable for ARC?
No. A standard HDMI cable that meets the HDMI version your devices support is sufficient. ARC is a protocol enabled at the port and device level, not a special cable requirement, though very old or low-quality cables can cause reliability issues.
Why is there no sound through my soundbar even though it is connected via ARC?
The most common causes are using a non-ARC HDMI port, HDMI-CEC being disabled on the TV, or outdated TV firmware. Check the port labeling and CEC setting before assuming the hardware is faulty.
Is HDMI ARC the same on every TV brand?
The underlying HDMI standard is the same, but CEC branding differs, since each manufacturer uses its own name for CEC-based features, which can make the setting harder to find in menus.
Should I upgrade to eARC if I already have ARC working fine?
If your current audio setup does not include Dolby Atmos or another object-based format, ARC may be all you need. If you plan to add an Atmos soundbar or receiver, eARC removes a real bandwidth ceiling.
Where to go next