For most modern systems, HDMI ARC vs optical for a soundbar has a clear winner: use HDMI ARC or eARC when both products support it. HDMI can combine TV audio with HDMI-CEC power and volume control, and eARC supports higher-bandwidth formats. Choose optical when ARC is unavailable, unstable, or unnecessary for a simple stereo or compressed-surround setup.

Quick decision

  • Choose eARC: for the strongest format support, including compatible lossless and immersive audio.
  • Choose ARC: for one-cable TV audio and convenient remote control on compatible equipment.
  • Choose optical: for dependable basic audio when HDMI handshakes or CEC cause trouble.

How the connections differ

HDMI ARC uses a specially labeled TV HDMI port to return sound to the soundbar. CEC can let the TV remote adjust soundbar volume and power. Standard ARC commonly carries stereo PCM and compressed multichannel formats; exact support varies. eARC increases bandwidth and improves support for higher-quality formats, but both ends must support eARC.

Optical, also called TOSLINK, sends digital audio using light. It commonly supports stereo PCM and compressed Dolby Digital or DTS, depending on the equipment. It does not carry HDMI-CEC commands and generally does not carry the high-bandwidth lossless formats used by advanced systems.

Close comparison of HDMI and TOSLINK optical cable connectors
HDMI adds control and broader format potential; optical offers a simple, electrically isolated audio link.

Sound quality and reliability

With the same supported format, neither cable makes digital sound inherently warmer or clearer. The meaningful difference is which formats and controls the connection can carry. Optical can avoid electrical ground-loop noise and HDMI handshake issues. HDMI reduces remotes and may automatically switch the TV to external audio. If your system plays ordinary stereo television, optical can sound every bit as clean. The advantage of HDMI appears when you need formats optical cannot transport, automatic input switching, or coordinated power and volume control.

Set up either method correctly

For ARC/eARC, connect the two ports specifically labeled ARC or eARC, enable HDMI-CEC, choose Receiver or HDMI audio output, and select the soundbar’s TV/ARC input. For optical, connect TV Optical Out to soundbar Optical In, remove protective caps, choose Optical or External Speaker output, and select the optical input. More help is available in our HDMI ARC setup and optical setup.

If you still cannot choose or hear sound, use the Soundbar & Audio Gadget Wiz.

What to buy

For an eARC-capable system, compare a certified HDMI cable suitable for eARC. For an optical-only route, compare a TOSLINK optical audio cable. Avoid buying an adapter until you confirm the port direction.

Frequently asked questions

Can I connect HDMI and optical at the same time?

You can physically connect both on many systems, but automatic priority can cause confusion. Use one while troubleshooting.

Does optical support Dolby Atmos?

Optical does not carry the high-bandwidth Atmos formats associated with modern TV systems. Some products may create virtual height effects from other signals.

Why does ARC control volume but optical does not?

ARC can work with HDMI-CEC control commands. Optical carries audio data, not those HDMI control commands.

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