What Is HDMI ARC? ARC vs eARC and How to Set It Up

HDMI ARC (Audio Return Channel) lets your TV send its sound back down an HDMI cable to a soundbar or AV receiver. Normally HDMI carries picture and sound into the TV. ARC adds a return path, so one cable between the TV and the soundbar handles the audio from everything the TV plays: its built-in apps, its tuner, and any streaming box plugged into its other HDMI ports. eARC is the newer, faster version of the same idea.

If you have a TV, a soundbar and a streaming box, ARC decides how many cables you run, which remote controls the volume, and whether surround sound reaches your speakers at all.

What ARC actually does

Picture a normal setup. A streaming box, game console or Blu-ray player sends video and audio into the TV over HDMI. Before ARC, getting that sound out of the TV and into a soundbar meant a second cable, usually optical, running from the TV's audio output to the speaker.

ARC, introduced with the HDMI 1.4 specification, removed that second cable. One HDMI port on the TV is wired to send audio in the other direction, upstream to the sound system. You connect that port to the soundbar's ARC port, and the TV passes along whatever it is playing.

ARC almost always works alongside HDMI-CEC, a separate control feature that lets devices talk to each other over the same cable. CEC is what lets your TV remote change the soundbar's volume and lets the soundbar switch on with the TV. ARC moves the sound; CEC moves the commands. When people say "ARC isn't working", the cause is often CEC.

How to tell if your TV has ARC

Look at the HDMI ports on the back or side of the TV. The ARC port is labeled, usually HDMI ARC, ARC or eARC, printed next to one of the inputs. Most TVs have only one, and on many models it is HDMI 2 or HDMI 3 rather than HDMI 1. Your soundbar or receiver needs a matching port, often labeled HDMI OUT (ARC), HDMI eARC or TV.

No label on either device means no ARC on that device. Most TVs sold in the last decade have it, but check before you buy cables or a soundbar.

ARC vs eARC

eARC (Enhanced Audio Return Channel) arrived with HDMI 2.1. It does the same job with much more bandwidth, which matters for lossless and object based surround formats. According to HDMI Licensing, eARC supports uncompressed 5.1 and 7.1 audio at up to 192kHz and 24-bit, along with formats like Dolby TrueHD and DTS-HD Master Audio.

	ARC	eARC
Introduced with	HDMI 1.4	HDMI 2.1
Stereo	Yes	Yes
Compressed 5.1 (Dolby Digital, often DTS)	Yes	Yes
Dolby Digital Plus (used by streaming apps, including their Atmos)	On many TVs, not all	Yes
Uncompressed 5.1 and 7.1, Dolby TrueHD, DTS-HD Master Audio	No	Yes
Who benefits	TV speakers replaced by a soundbar	Home theater setups with lossless sources

Both ends must support eARC to get eARC. An eARC TV connected to an ARC soundbar falls back to plain ARC, and the reverse is also true.

Streaming services deliver Dolby Atmos inside Dolby Digital Plus, a compressed format, not the lossless TrueHD you get from a Blu-ray disc. Plenty of ARC setups can carry Dolby Digital Plus, so streaming Atmos does not automatically require eARC. Lossless audio does. If you mostly stream live TV and on-demand content, an ARC soundbar is usually enough. If you play 4K Blu-rays through the TV, eARC is worth paying for.

Where should your streaming box plug in?

There are two sensible layouts, and the choice affects both picture and sound.

Option 1: box into the TV, TV to the soundbar (simplest)

Plug the streaming box into any normal HDMI input on the TV. Run one cable from the TV's ARC port to the soundbar's ARC port. The TV is the hub: it shows the picture and sends every source's audio to the soundbar. This works with any ARC soundbar, even ones with no HDMI inputs, and you only switch inputs on the TV.

The catch is that the TV decides what audio format goes out over ARC. Some TVs pass the box's surround signal straight through, and some convert it to stereo. That is controlled by a setting covered in the setup steps below.

Option 2: box into the soundbar or receiver

If your soundbar or receiver has HDMI inputs, you can plug the box into it and run its HDMI output to the TV. The audio never has to make the return trip, so ARC's limits do not apply to that box. The trade off is that the soundbar must pass the video through untouched. If it does not support the resolution and HDR format your box sends, you lose picture quality to gain sound. Check its passthrough specs first, especially for 4K and HDR (our guides to 1080p vs 4K and HDR vs SDR explain what those signals need).

For most people with a single set-top box or streaming stick, Option 1 is the right call.

How to set up HDMI ARC

Connect the right ports. One HDMI cable from the TV's ARC or eARC port to the soundbar's ARC, eARC or TV port. Any other HDMI port on either device will not carry return audio.
Turn on HDMI-CEC on the TV. Each brand renames it. Look for Anynet+ (Samsung), SimpLink (LG), BRAVIA Sync (Sony), EasyLink (Philips), T-Link (TCL) or VIERA Link (Panasonic). Other brands usually just call it HDMI-CEC or HDMI control.
Turn on eARC if you have it. Some TVs ship with eARC switched off in the sound menu. If both devices support it, enable it.
Set the TV's sound output. In the sound menu, choose the receiver, soundbar or HDMI ARC as the output instead of the TV speakers.
Set the digital audio format. Choose Auto, Bitstream or Passthrough so surround signals reach the soundbar intact. PCM tells the TV to convert everything to stereo.
Test two sources. Play something from the TV's own app, then something from the streaming box. If one works and the other does not, the problem is in that source's audio settings, not the cable.

HDMI ARC troubleshooting

Symptom	Likely cause	What to try
No sound at all	Cable in the wrong port, or the TV is still set to its own speakers	Move the cable to the labeled ARC ports on both ends, then set the TV's output to the soundbar
Sound works but the TV remote won't change the volume	HDMI-CEC is off on one device	Enable CEC on the TV and on the soundbar, then restart both
Sound works, then stops after the TV sleeps	The devices lost their CEC handshake	Turn everything off, unplug the TV and soundbar from power for a minute, plug in the soundbar first, then the TV
Only stereo, no surround	TV audio format set to PCM, or the box is outputting stereo	Set the TV's digital audio to Auto or Passthrough, and check the box's audio output setting
Voices out of sync with lips	Different processing delay in the TV and the soundbar	Use the AV sync or audio delay setting on the soundbar or TV; eARC handles lip sync more reliably
Atmos badge never appears	The content is not in Atmos, or the TV converts Dolby Digital Plus over ARC	Confirm the title is in Atmos, then try passthrough, or plug the box into the soundbar directly

If you have worked through the table and still get nothing, try a different HDMI cable before anything else. A damaged cable can carry a picture fine while the return audio drops out.

Do you need a special HDMI cable for ARC?

No. For ARC, any decent High Speed HDMI cable works, and you do not need a cable marketed as "ARC". For eARC, a High Speed HDMI Cable with Ethernet or an Ultra High Speed HDMI Cable is the safe choice, because eARC uses a channel inside the cable that very old or very cheap cables may not wire properly. If eARC is unstable, replacing the cable is the first fix to try.

ARC vs optical

An optical cable carries stereo and compressed 5.1, much like ARC. It cannot carry Dolby Digital Plus or lossless formats, and it does not carry CEC, so you lose single remote volume control. Use optical only when your TV or soundbar has no ARC port, or as a fallback while you sort out a stubborn ARC connection.

Frequently asked questions

What is the difference between HDMI and HDMI ARC?

An HDMI ARC port is a normal HDMI input with one extra ability: it can also send audio out of the TV to a sound system. It looks the same as the other ports and only the label tells them apart.

Can I use the HDMI ARC port as a regular HDMI input?

Yes. The ARC port works as a normal input for a streaming box or console. You only need it free if you want to connect a soundbar or receiver by HDMI.

Should I plug my soundbar into HDMI ARC?

Yes, if both the TV and soundbar have ARC. It gives you one cable, one remote for volume, and better format support than optical. Use the eARC port if both devices have one.

Do I need eARC for Dolby Atmos?

Not always. Streaming Atmos travels inside Dolby Digital Plus, which many ARC setups can carry. You need eARC for lossless Atmos in Dolby TrueHD, which comes from discs and some media players.

Why is there no sound through my HDMI ARC soundbar?

Most often it is one of three things: the cable is in a non-ARC port, HDMI-CEC is switched off, or the TV's sound output is still set to its internal speakers. Check them in that order.

Still stuck on a specific device? Our setup tutorials walk through individual boxes and TVs, and support can help if the sound problem only happens in one app.

Specification details come from HDMI Licensing's page on the Enhanced Audio Return Channel.