If you are connecting a TV to a soundbar, AV receiver, or home theater system, the two most common options are HDMI ARC and optical audio.
Both can send TV audio to an external audio device, but they are not the same. HDMI ARC vs optical mainly comes down to device compatibility, audio format support, remote control convenience, and whether you need higher-quality audio.
Quick answer:
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For a modern TV and soundbar, use HDMI ARC first.
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For higher-quality audio or Dolby Atmos, use HDMI eARC if your devices support it.
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For older TVs or older audio systems, optical audio is still useful.
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For basic stereo or 5.1 audio, either HDMI ARC or optical can work.
Here is the simple breakdown.
What Is HDMI ARC?
HDMI ARC stands for HDMI Audio Return Channel.
A regular HDMI connection usually sends video and audio from a media player, game console, or set-top box to a TV. HDMI ARC allows the TV to send audio back to a soundbar or AV receiver through the same HDMI connection.
A typical setup looks like this:
TV HDMI ARC port → Soundbar HDMI ARC portThe main benefit of HDMI ARC is convenience. It usually needs only one HDMI cable to send TV audio to the soundbar, and it often works with HDMI CEC, so you can control soundbar volume with the TV remote.
HDMI ARC is useful when:
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Your TV and soundbar both support HDMI ARC.
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You want fewer cables.
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You want to control soundbar volume with the TV remote.
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You often use built-in TV apps or streaming services.
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You want a more integrated modern soundbar experience.
However, HDMI ARC is not the same as HDMI eARC. ARC has limited bandwidth, while eARC supports higher-quality audio formats.
What Is Optical Audio?
Optical audio, also called digital optical audio or Toslink, uses a fiber optic cable to transmit digital audio. It is common on TVs, soundbars, AV receivers, and older audio devices.
A typical setup looks like this:
TV optical output → Soundbar optical inputOptical audio is simple, stable, and widely compatible with older devices. Even if your TV or soundbar does not support HDMI ARC, it may still support optical audio.
Optical audio usually supports:
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Stereo PCM
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Dolby Digital
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DTS 5.1
However, optical audio has lower bandwidth. It is not suitable for high-bandwidth formats such as Dolby TrueHD, DTS-HD Master Audio, or high-quality Dolby Atmos.
In simple terms, optical audio is good for basic TV sound and standard 5.1 surround sound, but it is not ideal for high-end home theater audio.
HDMI ARC vs Optical: Key Differences
This table shows the main differences between HDMI ARC and optical audio.
| Feature | HDMI ARC | Optical Audio |
| Cable type | HDMI cable | Optical / Toslink cable |
| Main use | TV audio return to soundbar | Digital audio output |
| Remote volume control | Usually yes with HDMI CEC | Usually no |
| Stereo audio | Yes | Yes |
| Dolby Digital 5.1 | Yes | Yes |
| DTS 5.1 | Depends on device | Usually yes |
| Dolby TrueHD / DTS-HD MA | No, needs eARC | No |
| Dolby Atmos | Limited, depends on format | Very limited |
| Best for | Modern TVs and soundbars | Older TVs and basic audio setups |
For regular stereo or Dolby Digital 5.1, the sound quality difference is usually small. The real differences are format support, control convenience, and device compatibility.
HDMI ARC is more convenient because it can work with TV control features. Optical audio is simple and stable, but it offers fewer modern features.
Which One Is Better for a Soundbar?
For most soundbar users, HDMI ARC is usually the better choice.
The reason is that HDMI ARC does more than send audio. It also helps the TV and soundbar work together. With HDMI CEC, many TVs can control soundbar volume directly with the TV remote and may also support power control between devices.
If you have a newer TV and soundbar, try HDMI ARC first.
Optical audio is still useful if your TV does not have HDMI ARC, if your soundbar is older, or if ARC is not working reliably.
Simple guide:
| Situation | Better Choice |
| New TV and soundbar | HDMI ARC |
| Want TV remote volume control | HDMI ARC |
| Older TV or audio system | Optical audio |
| Basic stereo or 5.1 sound | HDMI ARC or Optical |
| HDMI ARC not working | Optical as backup |
| High-quality Atmos or lossless audio | HDMI eARC |
If both options are available, start with HDMI ARC.
If you only need basic audio or you are using older devices, optical audio can still work well.
What About eARC?
eARC stands for enhanced Audio Return Channel. It is the upgraded version of HDMI ARC.
Compared with ARC, HDMI eARC has higher bandwidth and supports more advanced audio formats, such as:
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Dolby TrueHD
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DTS-HD Master Audio
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Lossless Dolby Atmos
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Higher-quality home theater audio
If you are comparing eARC vs optical, eARC is clearly more capable for audio quality.
However, eARC requires your TV, soundbar, or AV receiver to support eARC. Your content source also needs to provide the audio format you want.
If you mostly watch regular TV, online video, or standard streaming content, HDMI ARC or optical may already be enough.
Conclusion
HDMI ARC and optical audio can both send TV sound to a soundbar or AV receiver, but they are best for different situations.
Optical audio is simple and stable, making it useful for older devices and basic audio.
HDMI ARC is better for modern TVs and soundbars, especially if you want fewer cables, TV remote volume control, and a more convenient setup.
If you need Dolby TrueHD, DTS-HD Master Audio, or lossless Dolby Atmos, HDMI eARC is the better choice.
The simplest rule is: use HDMI ARC for modern soundbars, optical for older devices, and HDMI eARC for higher-end home theater audio.
