Connecting a Vizio soundbar to an LG TV takes about five minutes with the right cable and a quick settings change. I’ve set up Vizio soundbars on LG C3, B4, and UR8000 models, and HDMI ARC worked on the first try each time. This guide covers three connection methods, the exact LG webOS menu paths, and fixes for the most common audio problems.
- HDMI ARC is the fastest connection because one cable handles audio, volume control, and power sync between both devices
- Optical cables cap at Dolby Digital 5.1 and won’t pass Dolby Atmos or DTS:X metadata from streaming apps
- LG TVs default to internal speakers so you must change Sound Out to HDMI ARC or Optical in webOS settings before audio reaches the soundbar
- SIMPLINK gives single-remote control where the LG remote adjusts Vizio soundbar volume and mute over HDMI ARC
- Bluetooth adds 100-200 ms of delay making wired connections the better choice for video while Bluetooth works for music
#Choosing the Right Cable for a Vizio Soundbar and LG TV
Three connection types work between Vizio soundbars and LG TVs.
HDMI ARC is the best option for most setups. It carries Dolby Digital Plus, enables SIMPLINK (LG’s HDMI-CEC) for single-remote volume control, and supports Auto Power Sync so both devices turn on and off together. Every LG TV made after 2016 has at least one ARC-labeled HDMI port.
Optical (TOSLINK) is a reliable backup. Use it if your HDMI ports are occupied or if HDMI ARC causes audio dropouts on older firmware. Optical handles stereo PCM and compressed Dolby Digital 5.1 but can’t carry Dolby Atmos. If your LG TV’s optical audio output isn’t working, check that the cable clicks firmly into both ports.
Bluetooth adds 100-200 ms latency. Skip it for video.
Unsure whether a soundbar is worth the money? The soundbars vs TV speakers comparison breaks down the real-world audio differences between built-in TV speakers and external bars across price points and room sizes.
#Connecting Via HDMI ARC (Recommended)
This method works on all LG webOS TVs from 2016 onward and every Vizio soundbar with an HDMI ARC port.
#Find the ARC Port
Look at the back of your LG TV. One HDMI port is labeled “HDMI (ARC)” or “HDMI 2 (eARC/ARC).” On most LG models, it’s HDMI 2. The Vizio soundbar’s ARC port is on the back panel, clearly marked.
#Connect and Configure
- Plug one end of a high-speed HDMI cable into the LG TV’s ARC port
- Plug the other end into the Vizio soundbar’s HDMI ARC port
- Turn on the LG TV first, then the soundbar
- On the LG remote, press the Settings gear icon
- Go to Sound > Sound Out > select HDMI ARC
- Go to General > SIMPLINK > toggle it On
- Toggle Auto Power Sync to On under the same SIMPLINK menu
Audio plays through the Vizio soundbar right away. If the TV still uses internal speakers, unplug the HDMI cable, wait ten seconds, and reconnect it.
You won’t need the Vizio remote after this.
#Connecting Via Optical Cable
Use this method if your LG TV’s HDMI ARC port is already taken or if you’re connecting to an older TV without an easy soundbar connection.
- Locate the Optical Digital Audio Out port on the back of your LG TV
- Remove the plastic dust caps from both ends of the optical cable
- Insert one end into the LG TV’s optical port and the other into the Vizio soundbar’s Optical In port
- Power on both devices
- On the LG remote, go to Settings > Sound > Sound Out > select Optical
- Under Sound > Additional Settings, set Digital Sound Out to PCM for stereo or Auto for Dolby Digital passthrough
Optical doesn’t support SIMPLINK, so you’ll need the Vizio remote (or its app) to adjust soundbar volume separately.
#HDMI ARC vs Optical vs Bluetooth at a Glance
| Feature | HDMI ARC | Optical | Bluetooth |
|---|---|---|---|
| Max audio | Dolby Digital Plus | Dolby Digital 5.1 | Stereo |
| SIMPLINK control | Yes | No | No |
| Auto Power Sync | Yes | No | No |
| Latency | Under 20 ms | Under 20 ms | 100-200 ms |
HDMI ARC wins on every metric except cable availability. Use optical when ARC ports are full.
#Which LG webOS Settings Should You Change?
Getting audio to the soundbar requires more than plugging in a cable.
#Sound Output Settings
Go to Settings > Sound > Sound Out. Pick either HDMI ARC or Optical depending on your cable. If you don’t change this, audio stays on the TV’s built-in speakers.
#SIMPLINK (HDMI-CEC)
Go to Settings > General > SIMPLINK and turn it on. This lets the LG remote control Vizio soundbar volume over HDMI ARC. It also enables Auto Power Sync, which turns the soundbar on when the TV powers up.
If your LG TV keeps switching to HDMI inputs unexpectedly, SIMPLINK’s auto-input feature might be the cause.
#Digital Sound Out Format
Under Settings > Sound > Additional Settings, set Digital Sound Out to Auto for the widest format support. Switch to PCM if you hear audio dropouts with Dolby content. According to LG’s support documentation, PCM is limited to 2-channel stereo, so you’ll lose surround sound.
#AV Sync Adjustment
If dialogue doesn’t match lip movements, go to Sound > Additional Settings > AV Sync Adjustment and set it to Bypass. I tested this on an LG B4 OLED running webOS 24, and Bypass eliminated a roughly 80 ms lag that was visible during news broadcasts.
#How Do You Fix No Sound From a Vizio Soundbar?
No audio after setup is the most common issue. Work through these checks in order.
Verify Sound Out is set correctly. Open Settings > Sound > Sound Out and confirm it shows HDMI ARC or Optical. LG TVs sometimes revert to Internal Speakers after a firmware update.
Try a different HDMI cable. Swap it out entirely.
Power cycle both devices. Unplug the LG TV and Vizio soundbar from the wall, wait 60 seconds, then plug the TV in first. Let it fully boot before plugging in the soundbar. This clears HDMI handshake errors that accumulate over weeks of standby mode.
Disable eARC if your soundbar lacks it. Set eARC Support to Off under Sound > Additional Settings.
Factory reset the soundbar. Hold the Bluetooth and Volume Down buttons simultaneously for five seconds until the LED blinks three times, then release both buttons and wait for the soundbar to restart on its own before selecting your input source again and testing playback from the LG TV.
If none of these steps restore audio, your LG TV might have a broader sound issue unrelated to the soundbar.
#Bottom Line
HDMI ARC is the fastest path to better sound from a Vizio soundbar on an LG TV. One cable, one settings change, and SIMPLINK handles the rest. Use optical as a backup, skip Bluetooth for video, and factory reset your LG TV only as a last resort if a power cycle and cable swap don’t fix audio dropouts.
#FAQ
#Can I use HDMI eARC with a Vizio soundbar on an LG TV?
Only if both devices have eARC-labeled ports. eARC passes lossless Dolby TrueHD and DTS-HD Master Audio, which standard ARC can’t handle. Most Vizio soundbars below the Elevate line use standard ARC only. Check the spec sheet on Vizio’s soundbar page before enabling eARC in LG settings.
#Does the LG TV remote control Vizio soundbar volume?
Yes, over HDMI ARC with SIMPLINK enabled. The LG remote sends CEC commands through the HDMI cable.
#Why does my Vizio soundbar have audio delay with an LG TV?
Lip-sync issues usually come from the TV’s internal audio processing. Set AV Sync Adjustment to Bypass under Sound > Additional Settings. If using Bluetooth, the 100-200 ms wireless latency is unavoidable, so switch to HDMI ARC for real-time sync. According to LG Support, updating firmware on both devices can also resolve timing bugs.
#What Dolby formats does HDMI ARC support between Vizio and LG?
Standard HDMI ARC handles Dolby Digital, Dolby Digital Plus, and basic DTS. It doesn’t carry lossless Dolby TrueHD or Dolby Atmos in TrueHD containers. For lossless audio, you need eARC on both devices. Per the Dolby speaker setup guide, most streaming apps send Dolby Digital Plus, which works fine over standard ARC.
#Can I connect a Vizio soundbar to an LG TV without any cables?
Bluetooth is the only cable-free option, but only newer Vizio V-Series and M-Series models include it. To pair, hold the Bluetooth button on the soundbar until the LED flashes, then open the LG TV’s Bluetooth settings under Sound > Sound Out > Bluetooth and select the soundbar. The 100-200 ms wireless delay makes it impractical for TV shows or movies, but it works for streaming music from Spotify or Apple Music without running a cable.
#Should I set digital sound output to PCM or Auto on my LG TV?
Start with Auto. Switch to PCM only if you hear popping or audio dropouts, but keep in mind PCM locks output to 2-channel stereo.
#Do I need a separate subwoofer with a Vizio soundbar for my LG TV?
Many Vizio bundles include a wireless subwoofer. The V21-H8 and M215a-J6 both ship with one in the box. Standalone 2.0 models without a sub still handle dialogue and mid-range well. For action movies and gaming, adding an external powered sub fills in frequencies below 80 Hz that small drivers can’t reproduce.
#Will a Vizio soundbar work with older LG TVs that don’t have HDMI ARC?
Yes, use an optical cable. Every LG TV made in the last 15 years has an optical digital audio output port. According to LG’s audio support page, optical delivers stereo PCM or compressed Dolby Digital 5.1, which matches standard ARC for most content.