What Is HDMI ARC and How Does It Work with Soundbars? | One Cable Audio Fix

HDMI ARC lets a TV send audio back to a soundbar over the same HDMI cable that feeds video into the TV. The TV becomes the audio hub, all sources stay plugged into the TV, and the bar handles the sound — provided you use the right port and set the TV to output audio externally.

For the full breakdown, see our best ARC Soundbars guide.

What Does ARC Actually Do?

ARC (Audio Return Channel) sends audio from the TV back down an HDMI cable to a soundbar or AV receiver, eliminating the separate optical cable. With HDMI-CEC enabled, the TV remote also controls the soundbar’s volume and mute.

It arrived with HDMI 1.4, and HDMI.org lists ARC support among its specifications and programs. That matters for older gear: a pre-ARC TV cannot send audio back regardless of cabling.

Which Ports Do You Need?

The TV side must be labeled ARC or eARC — a standard HDMI IN port cannot send audio back. On the soundbar, the jack is usually labeled HDMI OUT (TV-ARC), HDMI TO TV, or similar. One cable between those ports is the entire physical setup. Both ends say “HDMI,” so mismatching an ARC TV port to a standard soundbar input produces silence. Sonos states this directly: connect to the HDMI ARC/eARC port; a standard HDMI port produces no sound.

Step-by-Step Setup

1. Plug one HDMI cable into the TV port marked ARC or eARC.
2. Plug the other end into the soundbar’s HDMI OUT (TV-ARC) jack.
3. Turn on HDMI-CEC on the TV. On a TCL TV: Home > Settings > System > Control other devices (CEC), then highlight HDMI ARC and press OK.
4. Set the TV’s speaker output to external speakers or HDMI ARC. Samsung owners pick external speaker / HDMI ARC; LG owners set the output speaker to HDMI ARC.
5. Switch the soundbar input to D.IN (Samsung), OPT/HDMI ARC (LG), or its TV/ARC selection.

If the bar stays silent, confirm the TV output is still set to external speakers — that setting resets on some TVs — and try toggling CEC off and back on. Once ARC works, one remote runs volume and mute across both devices.

ARC vs. eARC

eARC (Enhanced Audio Return Channel) is a later advancement supporting higher-bitrate audio and broader codec support; ARC carries the everyday formats most TV apps and streaming sticks produce. Per HDMI’s specs, eARC supports up to 192 kHz/24-bit audio, uncompressed 5.1 and 7.1, 32-channel uncompressed audio, DTS-HD Master Audio, DTS:X, Dolby TrueHD, and Dolby Atmos — HDMI’s Enhanced Audio Return Channel specifications list them in full. If only ARC is available, everything still works, capped at standard ARC quality.

Two limits apply either way: ARC requires both devices to support it, and many TVs ship with it disabled by default (TCL has users enable it in the CEC menu). Without ARC support, optical is the honest fallback and still delivers solid sound. Bars differ widely in price and features; this roundup of tested ARC soundbar picks matches bars to real setups.

FAQs

Does ARC work if only one device supports it?

No. Both the TV and the soundbar or receiver must support ARC. If the TV lacks it but the bar has an optical input, optical still delivers TV audio, though the TV remote may not control volume without CEC.

Why is there no sound after connecting the cable?

Three culprits cover most cases: the TV is using a standard HDMI port instead of the ARC-labeled one, HDMI-CEC is off, or the TV’s audio output is still set to internal speakers. Check all three in that order, then power-cycle both devices.

Can I use any HDMI cable for ARC?

Yes, a standard High Speed HDMI cable handles ARC, since the feature uses the same pins already present.