How HDMI ARC works with an LG soundbar
If you want cleaner TV audio with fewer cables, HDMI ARC is usually the simplest way to connect an LG soundbar to your television.
This guide explains the exact setup process, the TV and soundbar settings you need, and the most common problems that can stop audio from working.
HDMI ARC stands for Audio Return Channel.
It allows sound to travel from your TV back to the soundbar through the same HDMI cable, so you can control playback with one remote and avoid optical cable limitations.
What you need before you start
- An LG soundbar with an HDMI ARC or HDMI OUT (TV ARC) port
- A TV with an HDMI ARC port, usually labeled ARC or eARC
- A high-speed HDMI cable that is in good condition
- Access to the TV settings menu and sound output options
Many LG soundbars also support HDMI eARC, which is an enhanced version of ARC.
If your TV supports eARC, you can often get better format support and more reliable lip-sync performance, especially with Dolby Atmos content.
How to connect LG soundbar with HDMI ARC
- Turn off the TV and soundbar before connecting anything.
- Locate the HDMI ARC port on the TV.
It is often labeled HDMI ARC or HDMI eARC.
- Find the HDMI OUT or HDMI OUT (TV ARC) port on the LG soundbar.
- Connect one end of the HDMI cable to the TV’s ARC port.
- Connect the other end to the soundbar’s HDMI OUT (TV ARC) port.
- Turn on the TV and soundbar.
- Select the correct input on the LG soundbar, usually TV ARC or HDMI ARC.
- Open the TV sound settings and set the audio output to HDMI ARC, External Speaker, or Receiver, depending on the brand.
Once the connection is active, TV audio should play through the soundbar automatically.
If it does not, the issue is usually a TV setting, the wrong HDMI port, or a cable that does not support ARC properly.
LG TV settings that matter most
If you are using an LG TV with an LG soundbar, the setup is especially straightforward.
However, a few settings can affect whether ARC works correctly.
Enable Simplink on LG TVs
Simplink is LG’s HDMI-CEC control system.
It allows the TV and soundbar to communicate, which helps ARC function properly and lets you use one remote for volume control.
- Go to Settings
- Open General or Connection
- Find HDMI Settings or External Device Manager
- Enable Simplink (HDMI-CEC)
Select the correct sound output
After enabling Simplink, set the TV audio output to HDMI ARC or External Speaker.
Some LG menus may show the soundbar name directly once the connection is detected.
Check digital audio settings
For the best results, set digital sound output to Auto or Pass Through if available.
This helps preserve audio formats such as Dolby Digital and can improve compatibility with streaming apps and game consoles.
How to connect LG soundbar with HDMI ARC on non-LG TVs
You do not need an LG TV to use an LG soundbar with HDMI ARC.
Sony, Samsung, TCL, Hisense, and other brands can all work as long as the TV has a functioning ARC port and CEC control.
The exact menu names vary by manufacturer:
- Samsung: Anynet+ for HDMI-CEC and Sound Output for ARC
- Sony: BRAVIA Sync and Audio System
- TCL and Hisense: HDMI CEC and ARC output selection
- Vizio: CEC and TV Speakers Off or ARC-enabled output
If ARC does not activate automatically, make sure CEC is enabled on the TV.
Without CEC, ARC often fails to handshake correctly.
How to confirm the connection is working
There are a few simple ways to verify that your LG soundbar is actually using HDMI ARC:
- The soundbar display shows TV ARC, ARC, or HDMI
- TV audio comes through the soundbar instead of the internal speakers
- The TV remote controls soundbar volume
- Turning off the soundbar may mute TV audio or switch output
If the soundbar plays audio but the TV remote does not control volume, HDMI-CEC may still be disabled.
ARC can sometimes pass audio even when control features are incomplete.
Common HDMI ARC problems and fixes
No sound from the soundbar?
Start with the basics.
Confirm the cable is in the ARC-labeled ports on both devices, not a standard HDMI input on the soundbar.
Then verify that the TV audio output is set to the external speaker or ARC option.
Also check whether the soundbar input is set correctly.
LG soundbars often default to another source, such as Bluetooth or optical, after power cycling.
Sound cuts in and out?
Intermittent audio is often caused by a loose HDMI connection, a damaged cable, or a CEC conflict.
Replace the cable first, then power-cycle both devices by unplugging them for about 60 seconds.
Volume control does not work?
Enable HDMI-CEC on the TV.
On LG TVs, that means Simplink.
On other brands, the setting may be called Anynet+, BRAVIA Sync, or HDMI Control.
Once enabled, rescan the devices if the menu allows it.
Dolby Atmos or surround sound is missing?
HDMI ARC can support Dolby Digital and, on compatible systems, Dolby Atmos via compressed formats.
For the widest format support, use eARC if your TV and soundbar both support it.
Also confirm the streaming app, TV pass-through settings, and soundbar listening mode.
HDMI ARC vs optical cable for LG soundbars
Optical audio still works well for basic stereo and Dolby Digital playback, but HDMI ARC offers more convenience and control.
It allows the TV remote to manage volume, supports richer audio handling on compatible devices, and reduces cable clutter.
Choose HDMI ARC if you want:
- One-remote volume control
- Simpler setup
- Better compatibility with modern TVs
- Support for newer audio formats on eARC systems
Optical may still be useful if the TV’s ARC port is faulty or if the soundbar and TV have HDMI compatibility problems.
Best practices for stable ARC performance
- Use the HDMI cable included with the soundbar if it is certified and in good condition
- Keep both TV firmware and soundbar firmware updated
- Use the ARC or eARC port only; not every HDMI port supports audio return
- Avoid switching inputs too quickly during setup
- Power-cycle both devices after changing settings
Many connection problems are caused by old firmware or a TV that still remembers a previous sound device.
A fresh restart often fixes handshake issues without any advanced troubleshooting.
When to use eARC instead of ARC
If your LG soundbar and TV both support eARC, use it. eARC offers higher bandwidth than standard ARC and improves support for advanced audio formats, including uncompressed multichannel audio on compatible systems.
Even so, standard ARC remains a strong choice for everyday TV watching, streaming, and gaming.
For most users, the best option is simply the one that works reliably with the gear already installed.
Quick setup checklist
- Connect HDMI from TV ARC port to soundbar HDMI OUT (TV ARC)
- Enable Simplink or HDMI-CEC on the TV
- Set TV audio output to ARC, External Speaker, or Audio System
- Choose the TV ARC input on the soundbar
- Test volume control and audio playback
Once these steps are done, your LG soundbar should deliver clearer TV sound with minimal setup friction and a much cleaner home theater experience.