HDMI ARC vs eARC: Bandwidth Limits and Audio

What ARC and eARC name on a listing

ARC stands for Audio Return Channel. On a soundbar listing, the words "HDMI ARC" name the HDMI connection that sends audio from the TV back into the soundbar, so programs from the TV's apps and its tuner play through the bar without a second audio cable. This connection is what makes a soundbar a simple upgrade for a TV: you plug one HDMI cable from the bar into the TV's ARC-labeled port, and the TV sends its sound back down that same cable.

eARC, the enhanced Audio Return Channel, is the newer form. The HDMI 2.2 overview page cited below says eARC "simplifies connectivity, provides greater ease of use, and supports the most advanced audio formats and highest audio quality," and that it "ensures full compatibility between audio devices and upcoming HDMI 2.2 products." On a listing, eARC is a marker that the bar is built for the newest audio formats, even if the title does not name every format.

A listing may use several words for the same thing. You may see "HDMI ARC," "HDMI eARC," "Audio Return Channel," or simply "eARC." The latter three all point to the same port type, with eARC being the enhanced version. When you read a title, look for the exact term: ARC and eARC are not interchangeable names, and the difference matters for the formats the TV can send.

• HDMI ARC
• HDMI eARC
• Audio Return Channel
• eARC alone
• HDMI-CEC as a related term
• eARC with Dolby Atmos
• eARC with DTS:X

Bandwidth figures the HDMI spec states

The HDMI specification pages state bandwidth figures for the HDMI connection as a whole, not for the ARC or eARC audio return path separately. The HDMI 2.2 overview says the specification "supports up to 96Gbps bandwidth," and that the Ultra High Speed HDMI Cable, introduced with HDMI 2.1, "is applicable for system configurations supporting up to 48Gbps maximum bandwidth." These are the highest overall link rates the spec names, and they cover both video and audio.

Those figures describe the full video and audio link between devices. A soundbar listing rarely states a bandwidth number; it names the port type and the audio formats. When a listing does mention a bandwidth figure, it is usually in the context of the HDMI version, such as "HDMI 2.1" or "48Gbps," but that number is not limited to the audio return path. To find a bar's exact port details, read the listing's bullet list and the maker's product page, such as the audio pages at Samsung or Sonos.

The table below lists the two figures stated on the HDMI pages. Neither is labeled as an ARC or eARC-specific audio bandwidth. If a seller or maker page gives a separate number for eARC audio, treat that as a stated detail you can compare, but it is not present in the source pages cited here.

What eARC carries on a listing

On a soundbar listing, eARC tends to appear together with the audio formats it can carry, most often Dolby Atmos and DTS:X. A title may read "Dolby Atmos soundbar with HDMI eARC," or a bundle may name eARC alongside a separate subwoofer and rear speakers. The eARC audio formats article explains how those format names read.

When two listings differ only in the port name, the eARC listing names more advanced formats, and the older ARC name usually appears with Dolby Digital or DTS formats. Read the named formats, not the port alone. The ARC versus eARC comparison walks through the two names side by side.

eARC also appears on listings for bars that support high-resolution audio, but the listing may not use that phrase. Instead, it will name the formats: Dolby TrueHD, DTS-HD Master Audio, or multichannel PCM. These are the names you should look for when you want a bar that can handle the audio that a Blu-ray player or a streaming device with an HDMI output can send. The HDMI page does not list these formats individually, but they are part of what eARC is designed to carry.

Checking the ports before you buy

A soundbar's ARC or eARC port works with a TV that has the same port name. If your TV lists HDMI ARC, a soundbar listing that names HDMI eARC may still connect, but the advanced formats are named on the listing for a reason: check the TV's port name and the formats it sends. The audio return channel article covers what that port requires.

Read the TV's manual and the soundbar's listing side by side. The maker's product page is where the port details appear, and the seller's listing states which cable is in the box. The cable requirements article explains how a listing names the cable. Not every bar includes an HDMI cable; some list a separate cable as an accessory, and that is a question to check before you buy.

There is one more thing to check: whether your TV's ARC port is labeled clearly on the back. Some TVs label it "HDMI 1 (ARC)" or "HDMI 2 (eARC)." If the label is missing, the TV's manual will name the port. The same manual will tell you whether the TV sends Dolby Atmos over that port, which is the detail that decides whether an eARC soundbar is useful to you.

How the buying guides compare stated details

The guides on this site compare soundbars on stated details from listings, including the port name. A bar whose title names HDMI eARC and Dolby Atmos is described that way in the guide; a bar named only HDMI ARC is described as such. The guides do not guess at performance; they compare what the listing and the maker's page state.

The HDMI ARC soundbar guide covers bars whose listings name either port, and the Dolby Atmos guide lists bars whose titles name that format. Use the stated port name and formats to build a shortlist. If you want a bar that works with a TV that only has ARC, look for an ARC-named port; if your TV has eARC, you can choose either, but the eARC listing is the one that names the newest formats.

The premium soundbar guide is a good place to see how eARC appears alongside a separate subwoofer and rear speakers in a full home theater bundle. The best soundbar guide is a general starting point that lists bars with different port names, and you can filter by the port you need.

What to read on the listing and the maker's page

A soundbar listing is a shopping document, not a technical manual. The title gives you the port name and the format names, and the bullet list repeats them. The image set may show the back panel with the port labels, so you can verify that the port is labeled eARC or ARC. The maker's product page adds the full port list and often the cable contents.

When you compare two listings, write down four things: the port name (ARC or eARC), the audio formats named (Dolby Atmos, DTS:X, Dolby TrueHD, DTS-HD Master Audio), whether a subwoofer is built in or separate, and whether rear speakers are included. Those are the stated details that separate one bar from another. The guides on this site use the same stated details to make their picks.

The source pages cited here are the HDMI licensing page and the maker pages for Samsung and Sonos. They give you the official description of eARC compatibility and the names of the audio product lines. No page cited here lists a separate bandwidth number for the audio return path, so do not expect that figure on a typical listing. If you see a number like "37Mbps" for eARC on a different page, that is not from the HDMI spec pages used here, and you should treat it as a claim you can verify or ignore.

What this article cannot say

This article does not state how ARC or eARC sounds, how loud it plays, or which TV models work with a given bar. The catalogue and the pages cited here do not carry that data. Read the listing terms and the maker's page, and follow the maker's manual for setup and connection.

The HDMI specification is a technical standard, and its pages describe capabilities, not guarantees. A bar that names eARC may still rely on the TV to send the right format, and the TV's manual is the place to confirm that. If you have a question about a specific TV model, the maker's support page is the source to contact.

What to pick for your situation

Questions

Does a soundbar listing state an ARC or eARC bandwidth number?

Usually not. A listing names the port type and the audio formats. The HDMI pages cited here state overall connection bandwidth up to 96Gbps for HDMI 2.2 and up to 48Gbps for the Ultra High Speed HDMI Cable, but no separate ARC or eARC audio bandwidth figure. Read the maker's page for port details.

Is eARC backward compatible with older HDMI devices?

The HDMI 2.2 specification is backward compatible with earlier versions of the specification, per the HDMI page. Whether a particular TV and soundbar connect through ARC or eARC is something to check on both listings.

Does eARC appear with Dolby Atmos on a listing?

Yes. A title that names eARC often also names Dolby Atmos or DTS:X. The port name and the format names are separate stated details; read both.

What is the difference between ARC and eARC on a listing?

ARC is the older audio return connection. eARC is the enhanced version that the HDMI page says supports the most advanced audio formats and highest audio quality. On a listing, eARC tends to name more formats.

Should I buy a soundbar with eARC if my TV only has ARC?

You can still connect the bar with the ARC port, but the eARC formats are not available over an ARC connection. Check your TV's manual to see if it has an eARC port or an ARC port, and match the bar's port name to that.

What does the Ultra High Speed HDMI Cable have to do with eARC?

The HDMI page says the Ultra High Speed HDMI Cable supports up to 48Gbps maximum bandwidth and is applicable for configurations that need that bandwidth. A soundbar listing may say "Ultra High Speed HDMI Cable" when the bar is designed for 4K and eARC. The cable is not the same thing as the port, though; the port is on the bar.