Connecting a soundbar takes one cable and a few settings, but the wrong port or one buried menu option is the difference between Dolby Atmos and no sound at all. Here's which connection to use, the exact steps, and fixes for the problems people run into most.
The short answer
Connect the soundbar to your TV's HDMI port labeled ARC or eARC with an HDMI cable, turn on HDMI-CEC in the TV settings, set the TV's audio output to the soundbar, and set its digital audio format to Auto, Passthrough, or Bitstream.
Use an optical cable only if either device lacks HDMI ARC; it handles stereo and 5.1 but not Dolby Atmos. Avoid Bluetooth for TV sound because it adds lip-sync delay.
Which connection should you use?
| Connection | Dolby Atmos? | TV remote controls volume? | Use it when |
|---|
| HDMI eARC | Yes, including lossless | Yes (via HDMI-CEC) | Your TV and soundbar both have eARC. Best option. |
| HDMI ARC | Yes, compressed (Dolby Digital Plus) | Yes (via HDMI-CEC) | Either device only has ARC. |
| Optical (Toslink) | No; up to 5.1 Dolby Digital or DTS | Usually no | No HDMI ARC on the TV or soundbar. |
| Bluetooth | No | Sometimes | Last resort; adds lip-sync delay. |
Rule of thumb: use HDMI ARC or eARC whenever both devices have it. It carries the best audio formats, lets your TV remote control the soundbar's volume, and turns everything on and off together.
How to connect a soundbar with HDMI ARC or eARC
- Find the right HDMI port on your TV. Only one HDMI input supports ARC/eARC, and it's labeled "ARC" or "eARC" next to the port. Using any other HDMI input is the most common reason a soundbar stays silent.
- Connect the soundbar's HDMI port labeled "TV (ARC/eARC)" to that TV port. Some soundbars also have HDMI inputs for other devices; don't use those for the TV connection.
- Use a good HDMI cable. Any certified High Speed cable handles ARC; for eARC and Dolby Atmos, a certified Ultra High Speed cable removes the guesswork. A solid choice is the Monoprice 8K Certified Ultra High Speed HDMI cable; see all our HDMI cable picks.
- Turn on HDMI-CEC on the TV. Every brand names it differently: Anynet+ (Samsung), SIMPLINK (LG), BRAVIA Sync (Sony), and "HDMI-CEC" or "Control other devices (CEC)" on most Google TV and Roku TVs. It's usually under Settings > General, System, or Inputs.
- Turn on eARC if your TV has a separate eARC setting (often under Sound or Audio output). Some TVs leave it off by default.
- Set the TV's audio output to the soundbar, "HDMI ARC," or "Receiver" instead of the TV speakers.
- Set the TV's digital audio format to Auto, Passthrough, or Bitstream. If it's set to PCM or Stereo, the soundbar only receives two-channel sound, and Dolby Atmos and surround won't work.
- Test it: play something, and press volume on the TV remote. The soundbar's display or app should show the incoming format, such as Dolby Atmos or Dolby Digital.
How to connect a soundbar with an optical cable
If your TV or soundbar lacks HDMI ARC, optical works fine for stereo and standard 5.1 surround.
- Remove the protective caps from both optical ports, and plug the cable in until it clicks. The connector only fits one way.
- Set the TV's audio output to Optical, Digital Audio Out, or External Speaker.
- Set the digital audio format to Bitstream or Auto for 5.1 surround. If you hear no sound at all, try PCM, which some soundbars require.
- Program the soundbar to your TV remote if you want one remote. Many soundbars can learn the TV remote's volume buttons, since optical doesn't carry control signals.
Troubleshooting
No sound from the soundbar
Check, in order: the cable is in the TV's ARC/eARC port, the soundbar is set to its HDMI ARC (or Optical) input, HDMI-CEC is on, and the TV's audio output is set to the soundbar. Then power everything off, unplug the soundbar for a minute, and turn the TV on first.
Dolby Atmos isn't showing
Make sure the TV's digital audio format is Auto, Passthrough, or Bitstream, not PCM. Confirm the movie or show actually has an Atmos track, and that your streaming plan includes Atmos. Over ARC, Atmos arrives as compressed Dolby Digital Plus; for lossless Atmos from a 4K Blu-ray, you need eARC on both devices.
The TV remote doesn't control volume
That's HDMI-CEC. Turn it on in the TV settings, and check the soundbar's settings for a CEC or "TV remote control" option. On optical, use the soundbar's remote-learning feature instead.
Voices are out of sync with lips
Look for an AV sync, lip sync, or audio delay setting on the TV or soundbar and adjust it a little at a time. Bluetooth almost always adds noticeable delay, which is another reason to use HDMI.
Still stuck? Our step-by-step eARC troubleshooting guide covers firmware, CEC conflicts, and when the cable is actually to blame.
Choosing a soundbar, or going further
If you're still shopping, see our best soundbars and best soundbars under $300. Wondering whether a soundbar is enough at all? Read soundbar vs. AV receiver and soundbar vs. surround sound. The same eARC steps apply if you later connect an AV receiver instead.
Frequently asked questions
What is the best way to connect a soundbar to a TV?
HDMI ARC or eARC. Plug the soundbar into the TV's HDMI port labeled ARC or eARC, turn on HDMI-CEC, and set the TV's audio output to the soundbar. It carries the best audio formats, including Dolby Atmos, and lets the TV remote control the soundbar's volume.
What is the difference between HDMI ARC and eARC?
eARC has far more bandwidth, so it can pass lossless Dolby TrueHD Atmos and DTS:X from sources like 4K Blu-ray. Standard ARC is limited to compressed formats, including Dolby Atmos in Dolby Digital Plus. Both devices must support eARC to use it.
Is optical or HDMI better for a soundbar?
HDMI ARC or eARC is better. Optical can carry stereo and 5.1 Dolby Digital or DTS, but not Dolby Atmos or lossless audio, and it doesn't let the TV remote control the soundbar through HDMI-CEC.
Why is my soundbar not working with HDMI ARC?
The most common causes are using an HDMI port that isn't labeled ARC or eARC, HDMI-CEC being turned off, the TV's audio output still set to its own speakers, or the soundbar set to the wrong input. Power-cycling both devices often fixes it once the settings are correct.
Can I connect a soundbar to a TV without HDMI?
Yes. Use an optical (Toslink) cable if both have optical ports, or Bluetooth if they support it. Optical works well for stereo and 5.1 sound; Bluetooth adds delay and is best as a last resort.