ARC (Audio Return Channel) and eARC (Enhanced Audio Return Channel) both send audio from your TV back to a soundbar or receiver through a single HDMI cable. The difference is bandwidth — and that bandwidth determines whether you get compressed or lossless audio.
Quick answer
- ARC sends compressed audio only (Dolby Digital 5.1, up to ~1 Mbps). Good enough for most TV shows and casual viewing.
- eARC sends uncompressed and lossless audio (Dolby TrueHD, DTS-HD MA, Dolby Atmos, up to 37 Mbps). Required for full-quality movie soundtracks and lossless Dolby Atmos.
- If you have a Dolby Atmos soundbar or receiver, you want eARC. ARC can carry Dolby Digital Plus with Atmos metadata, but it's lossy and less stable.
- eARC requires a certified Ultra High Speed HDMI cable (48 Gbps) for reliable operation.
ARC vs eARC comparison
| Feature | ARC | eARC |
|---|---|---|
| Bandwidth | ~1 Mbps | 37 Mbps |
| HDMI spec | HDMI 1.4+ | HDMI 2.1 |
| Dolby Digital 5.1 | Yes | Yes |
| Dolby Digital Plus | Yes | Yes |
| Dolby TrueHD | No | Yes |
| DTS-HD Master Audio | No | Yes |
| Dolby Atmos (lossy, DD+) | Yes (limited) | Yes |
| Dolby Atmos (lossless, TrueHD) | No | Yes |
| Uncompressed 7.1 PCM | No | Yes |
| Lip sync correction | Basic | Automatic |
| Cable required | Standard High Speed | Ultra High Speed (48 Gbps recommended) |
When ARC is enough
ARC handles compressed Dolby Digital 5.1 and Dolby Digital Plus. If you're watching streaming apps (Netflix, Disney+, Apple TV+) through your TV's built-in apps, most content is delivered in Dolby Digital Plus anyway — and ARC can carry that, including DD+ with Atmos metadata.
ARC is fine if:
- Your soundbar doesn't support Dolby Atmos
- You primarily watch streaming content through TV apps
- You have an older TV or soundbar without eARC support
- You're not particular about lossy vs lossless audio
When you need eARC
eARC becomes essential when you want lossless audio from Blu-ray discs, or when you want the most stable and highest-quality Atmos experience from streaming.
You need eARC if:
- You have a Dolby Atmos soundbar or AV receiver and want lossless Atmos from Blu-ray
- You play 4K Blu-ray discs through a player connected to your TV
- You want uncompressed 7.1 PCM audio
- Your ARC setup drops audio or has lip sync issues (eARC's automatic lip sync correction often fixes this)
How to check if you have eARC
- Look at the HDMI ports on the back of your TV. One should be labeled "eARC" or "ARC/eARC."
- Check your TV's settings — look for an eARC toggle under Sound or HDMI settings.
- Check your soundbar or receiver specs — it must also support eARC on its HDMI output.
eARC port location by brand:
- LG OLEDs (C2/C3/C4/C5): HDMI 2
- Samsung TVs: Usually HDMI 2 or HDMI 3 (check label)
- Sony Bravia: Usually HDMI 3 (check label)
- TCL/Hisense: Usually HDMI 1 or HDMI 2 (check label)
Troubleshooting ARC/eARC issues
If audio isn't passing through ARC or eARC:
- Confirm you're using the correct HDMI port — only one port on your TV supports ARC/eARC
- Use a certified Ultra High Speed HDMI cable (48 Gbps) for eARC connections
- Enable eARC in your TV settings — some TVs have it disabled by default
- Power cycle everything — unplug TV, soundbar, and any sources for 60 seconds
- Set TV audio output to ARC/eARC — not "TV Speakers" or "Optical"
- Enable CEC/HDMI-CEC — eARC relies on CEC for device discovery
If ARC works but eARC doesn't, your HDMI cable may not support the higher bandwidth. Replace it with a certified Ultra High Speed cable.
FAQ
Can I use ARC and eARC at the same time? No. Your TV has one ARC/eARC port. eARC is backward-compatible with ARC — if your soundbar only supports ARC, the TV falls back to ARC automatically.
Does eARC require a special HDMI cable? For reliable eARC, use a certified Ultra High Speed HDMI cable (48 Gbps). Standard High Speed cables (10.2 Gbps) may work for basic ARC but often cause dropouts with eARC's higher bandwidth.
Will ARC carry Dolby Atmos? ARC can carry Dolby Digital Plus with Atmos metadata, which is the format most streaming apps use. But it's lossy compression. For lossless Atmos (Dolby TrueHD) from Blu-ray discs, you need eARC.
Why does my eARC keep cutting out? Usually a cable issue. Replace your HDMI cable with a certified Ultra High Speed cable (48 Gbps). Also check that eARC is enabled in both your TV and soundbar settings, and that CEC is turned on.
Getting the Most from Your Home Theater
Our best soundbar guide and best AV receivers guide cover the hardware that gets the most out of eARC and Dolby Atmos.