What Is HDMI ARC and eARC — and Why Does It Matter for Your Wall-Mounted TV and Soundbar?

HDMI ARC (Audio Return Channel) is a feature on most modern TVs and soundbars that lets audio travel back from the TV to the soundbar through the same HDMI cable your other devices already use — so you get clean, high-quality sound without a separate optical cable running down your wall. eARC (Enhanced Audio Return Channel) is the upgraded version, found on HDMI 2.1 ports, that supports Dolby Atmos and DTS:X for those who want full-object-based surround sound. For a wall-mounted TV with a soundbar, understanding which port to use and how to route that one cable is the difference between a clean finish and a mess of wires.

What is HDMI ARC, and what does it actually do?

HDMI ARC allows your TV to send its audio output back to your soundbar or AV receiver through the HDMI cable, rather than requiring a separate dedicated audio cable. Before ARC existed, a wall-mounted TV setup needed two separate cable runs to a soundbar: one HDMI for video input from a streaming device or cable box, and one optical or RCA audio cable to carry the TV's sound to the bar. ARC collapses those into one, which matters enormously when you're trying to keep a clean wall.

Practically speaking: plug your streaming device into the TV, connect the TV's ARC port to the soundbar's ARC port with a single HDMI cable, and the soundbar plays whatever the TV is outputting — Netflix, sports broadcasts, cable, gaming. No extra audio cable to hide.

ARC is also what makes HDMI CEC (Consumer Electronics Control) work between your TV and soundbar. With CEC active, your TV remote can control the soundbar's volume — so you do not need to juggle two remotes to adjust sound on a wall-mounted setup. Brands call this by different names: Samsung calls it Anynet+, Sony calls it Bravia Sync, LG uses SimpLink, but it all uses the same underlying HDMI signal.

What is eARC, and is it better than ARC?

eARC is the newer, higher-bandwidth version of ARC introduced with HDMI 2.1. The practical difference for most GTA homeowners comes down to audio formats: standard ARC can only carry compressed audio formats like Dolby Digital 5.1 or DTS. eARC carries uncompressed and object-based audio formats — Dolby Atmos, DTS:X, and PCM multichannel — which means a soundbar like a Sonos Arc, Samsung HW-Q990D, or Sony HT-A9M2 connected via eARC can deliver Atmos as the TV intends it, not a compressed version.

If your TV was made after 2020 and your soundbar supports Atmos, eARC is worth using when both devices support it. If you have an older soundbar that tops out at Dolby Digital 5.1, standard ARC is perfectly fine — and eARC is backward compatible, so an eARC TV port will still work with an ARC soundbar.

Which HDMI port is the ARC or eARC port on my TV?

The ARC or eARC port is almost always labelled directly on the TV's input panel — look for a port marked ARC, eARC, or both. On most Samsung, LG, Sony, and TCL TVs, it is HDMI port 2, though some models put it on port 1 or 3. Check the label on the port itself, not the TV's input menu — the input menu may list all ports without specifying which carries ARC.

Important: if you connect the soundbar's HDMI cable to a non-ARC port, no audio returns. Many homeowners discover this on their own and assume the soundbar is broken — switching to the labelled ARC port solves it immediately.

You will also need to enable eARC in the TV's audio settings if you want the full eARC signal. Samsung TVs have an eARC toggle in Sound → Expert Settings. LG TVs have it in Sound → HDMI Input Audio Format. After enabling it, select eARC as the output format if prompted.

How does HDMI ARC affect cable management for a wall-mounted TV?

For a wall-mounted TV, HDMI ARC is a significant advantage because it reduces the cable count between the TV and the soundbar from two cables to one. One cable is much easier to conceal neatly — whether that means routing it inside the wall or tucking it behind a slim surface raceway.

In most GTA and Hamilton detached homes — newer builds in Brampton, Milton, Waterdown, Burlington, Oakville, Whitby, and Stoney Creek — an installer can route an in-wall rated HDMI cable (look for CL3 or CL2 rating) between the TV and the soundbar position entirely out of sight, leaving zero visible cables. The result looks like the soundbar and TV are wireless — just two clean panels on the wall.

In concrete-wall condos — downtown Toronto, North York highrises, Mississauga City Centre, Hamilton's Stinson or Pier 8 towers — running cables inside the concrete wall is not practical. A slim, paintable surface raceway with a flat-profile HDMI cable routed neatly between the TV and soundbar positions is the professional go-to. The raceway sits flush against the wall and all but disappears once painted to match.

Sahil at SharpStage assesses the wall type before recommending which approach will give the cleanest finish in each home — in-wall on drywall, raceway on concrete, or a hybrid for mixed-construction properties common across older Hamilton neighbourhoods and Etobicoke post-war homes.

Do I need any special HDMI cable for ARC or eARC?

For standard ARC, any HDMI cable that carries High Speed certification (HDMI 1.4 or newer) will work. For eARC, the HDMI 2.1 specification requires a Premium High Speed or Ultra High Speed HDMI cable — look for the HDMI logo with those words printed on the packaging. Low-cost cables may claim to be HDMI 2.1 without meeting the spec, so buy from a reputable retailer.

For in-wall routing, make sure the cable carries a CL2 or CL3 in-wall rating — this is an Ontario Electrical Safety Authority requirement for cables running inside walls. Standard HDMI cables are not rated for in-wall use. Sahil uses in-wall rated cables on every cable concealment job across the GTA and Hamilton.

Frequently asked questions about HDMI ARC and eARC

Does HDMI ARC let me control the soundbar volume with my TV remote?

Yes — if you enable HDMI CEC on both the TV and soundbar. On Samsung, this is called Anynet+; on Sony, it is Bravia Sync; on LG, SimpLink. Once enabled, the TV remote's volume buttons control the soundbar output. Most people find this is the single biggest quality-of-life improvement in a wall-mounted TV and soundbar setup — the remote on the side table controls everything.

My TV and soundbar both support eARC, but the audio is not working. What should I check?

Check these in order: confirm the HDMI cable is plugged into the labelled ARC or eARC port (not another HDMI port); enable eARC in the TV's audio settings; enable HDMI CEC on both devices; and try a different Premium High Speed HDMI cable if the current one is older. Most eARC problems trace back to one of these four causes. If audio works but Dolby Atmos does not engage, the TV's audio format output may be set to Bitstream — check the TV's sound output format and set it to pass-through or Auto.

Does the soundbar have to be physically close to the TV to use HDMI ARC?

No — HDMI cables can be run at significant lengths without signal loss when using a quality cable. In a wall-mounted TV setup, the soundbar is typically positioned 2–4 inches below the TV, so the cable run is short and easy to conceal. In a larger room where the soundbar is further from the TV (for example, on a shelf or credenza below a wall-mounted TV in a high-ceiling space), a longer HDMI run still carries the full ARC or eARC signal — just ensure the cable is the right type for the distance.

Is HDMI ARC better than an optical cable for a wall-mounted soundbar?

For most setups, yes. HDMI ARC carries the same or better audio quality as optical, adds HDMI CEC remote control, and reduces your cable count. The only situation where optical has a small edge is if a TV's ARC implementation has a known compatibility issue with a specific soundbar model — this is rare in 2025–2026 hardware but does occasionally come up in older TVs paired with newer soundbars. If you run into sound dropouts on ARC, optical is a reliable fallback that does not require any settings changes.

Ready to get your wall-mounted TV and soundbar set up cleanly? SharpStage handles both in one visit — the TV mount, the soundbar bracket, and full cable concealment so the finished wall looks intentional from every angle. Sahil is available 7 days a week, 8 AM to 11 PM, with same-day appointments at no extra charge across the GTA and Hamilton. Text or call 437-599-5020 for a fast, honest quote. Pay After Service — always.

Learn more about SharpStage's soundbar installation service, or find your local guide: TV mounting in Toronto, TV mounting in Mississauga, TV mounting in Hamilton, or TV mounting in Brampton.