In this guide
ARC sends compressed audio over HDMI at around 1 Mbps. eARC sends uncompressed, lossless audio at up to 37 Mbps — meaning better sound quality and support for Dolby Atmos, DTS:X, and 7.1 channels. Both need the correct port and CEC enabled to work.
- Both TV and soundbar/receiver support the same standard (ARC or eARC)
- You connect to the labeled ARC or eARC HDMI port on both devices
- CEC is enabled in your TV settings
- You use a certified HDMI 2.1 cable for eARC connections
- Your soundbar only supports ARC but you expect eARC audio quality
- You use the wrong HDMI port (not labeled ARC/eARC)
- CEC is disabled, causing no audio or lip-sync problems
- You use a non-certified or older HDMI cable with eARC
What ARC and eARC actually do
Both ARC (Audio Return Channel) and eARC (Enhanced Audio Return Channel) let your TV send audio to a soundbar or AV receiver through the same HDMI cable that your source device uses. That means one cable instead of a separate optical or RCA audio run.
ARC was introduced with HDMI 1.4 and handles compressed formats like Dolby Digital and DTS — good enough for most TV watching. eARC arrived with HDMI 2.1 and dramatically increases bandwidth, unlocking lossless formats that ARC simply cannot carry.
Key differences at a glance
| Feature | ARC | eARC |
|---|---|---|
| HDMI version | 1.4 / 2.0 | 2.1 |
| Bandwidth | ~1 Mbps | ~37 Mbps |
| Audio formats | Dolby Digital, DTS | Dolby TrueHD, DTS-HD MA, Atmos, DTS:X |
| Max channels | 5.1 | 7.1 / 32 |
| Cable required | Standard HDMI | Certified HDMI 2.1 |
| CEC required | Yes | Yes (enhanced) |
When eARC matters — and when ARC is fine
If you stream Netflix or Disney+ with a mid-range soundbar, ARC is probably sufficient. You will get surround sound, just in a compressed form. eARC becomes important when you want full-quality Dolby Atmos from a Blu-ray player or a high-end soundbar that can decode lossless audio. For a deeper look at how HDMI handles video signals alongside audio, see does USB-C support video — the principles behind bandwidth allocation are similar.
What you need for eARC to work
- A TV with an HDMI port labeled eARC
- A soundbar or receiver with an eARC-capable HDMI input
- A certified HDMI 2.1 cable between the two devices
- CEC enabled on your TV (sometimes called Anynet+, Bravia Sync, or SimpLink depending on brand)
If your soundbar only supports ARC, connecting it to an eARC TV port will still work — but at ARC bandwidth only. You will not get lossless audio regardless of the cable. If you run into connection issues, check our guide on why HDMI connections stop working for troubleshooting steps that apply broadly to HDMI setups.
Common setup mistakes
- Plugging into any HDMI port instead of the one labeled ARC or eARC
- Using an older HDMI cable that cannot handle eARC bandwidth
- Forgetting to enable CEC in the TV menu after setup
- Assuming an eARC TV automatically upgrades an ARC soundbar
Bottom line: ARC works well for everyday TV audio and compressed surround sound. eARC is the upgrade you need if you want lossless Dolby Atmos or DTS:X — but only if both your TV and your soundbar or receiver support it, you use the right port, and you pair them with a certified HDMI 2.1 cable.