Soundbar 4K HDR Passthrough: What to Check

What passthrough names on a listing

A soundbar with an HDMI input and an HDMI output can sit in the video path between a source device and the TV. The source, such as a game console, a streaming box, or a Blu-ray player, sends both video and audio to the soundbar over an HDMI cable. The soundbar plays the audio and sends the video on to the TV over its HDMI output. Listing words for this include "HDMI input", "HDMI output", "HDMI in/out", and "passthrough" or "pass-through". The main soundbar guide compares bars on the stated details in their listings.

Not every listing states that the bar passes video through. Many titles name the brand, the channel layout, and the subwoofer, and leave the ports unstated. The phrase "HDMI in" on a listing is the earliest sign that the bar can receive a video signal. The phrase "HDMI out" or "ARC" names the port that goes to the TV.

The connection path: source, soundbar, TV

The passthrough path has two links: the source to the soundbar, and the soundbar to the TV. On the soundbar, the HDMI port labeled for input takes the source. The HDMI port labeled for output, which some listings name "ARC" or "eARC", goes to the TV. On the TV, connect the bar to the HDMI port labeled for ARC or eARC.

A listing that names more than one HDMI input tells you the bar can accept several sources. A single input is enough for one source. If you have a game console and a streaming box, two inputs let you keep both connected at once. The guide to HDMI inputs explains how to count inputs on a listing.

HDMI version words on a listing

A listing that states "HDMI 2.0", "HDMI 2.1", or "HDMI 2.2" is naming the HDMI specification the bar supports. The HDMI 2.2 specification page names support for 4K240 and 8K60 resolutions with full chroma and 10-bit or 12-bit color, and it describes dynamic HDR support for scene-by-scene depth, detail, brightness, contrast, and wider color gamuts.

Many short titles do not state an HDMI version. The version is a detail that usually appears on the maker's specification page, not in the product title. When you compare two bars, the one that states a higher HDMI version names a newer specification; the one that states none leaves the version to be read on the maker's page. For the audio formats that travel through these ports, see the HDMI ARC soundbars guide.

HDR format names on a listing

HDR is a video feature that a listing names with format words: "Dolby Vision", "HDR10", and "HDR10+" are the most common. The HDMI 2.2 specification page describes dynamic HDR as supporting ideal depth, detail, brightness, contrast, and wider color gamuts on a scene-by-scene or frame-by-frame basis.

A soundbar that passes through 4K video may not pass through every HDR format. The listing states which format names the bar supports. A title that says only "HDR" is less specific than one that says "Dolby Vision". For the difference between the two HDR formats, see Dolby Vision versus HDR10+.

When a listing says nothing about passthrough

A short listing title is a summary, not a full specification. A title that names the brand, the channel layout, and the subwoofer may leave out every HDMI detail. That is not a signal that the bar lacks passthrough; it is a signal to read further.

If the listing names an HDMI ARC or eARC port, the bar has at least one HDMI output. The input count and the HDR format list are details to read on the maker's page. The connectivity options article explains which ports appear on typical listings.

Passthrough versus ARC and eARC

ARC and eARC are names for the audio return channel on the TV's HDMI port. Passthrough is a different path. With passthrough, the source plugs into the soundbar, and the video travels through the bar to the TV. With ARC or eARC, the source plugs into the TV, and the audio returns to the bar.

Many soundbars support both paths. A listing that names eARC tells you the bar can receive high-bandwidth audio back from the TV. A listing that names HDMI inputs tells you the bar can sit between the source and the TV. For the bandwidth comparison, see the ARC and eARC bandwidth article.

What to check on the maker's page

The maker's page answers the three questions a listing often leaves open: the number of HDMI inputs, the HDMI version the bar supports, and the HDR formats that pass through. The page may also name a required cable. The HDMI licensing page explains that cable types carry logos; the Ultra High Speed HDMI Cable was introduced for the HDMI 2.1 specification and supports up to 48Gbps bandwidth.

When a bar arrives for 4K HDR passthrough, keep the original box and the manual. The manual names the exact ports and any settings needed for the HDMI inputs. For the cable details, see the HDMI cable requirements article.

What to pick for your situation

Questions

What does passthrough mean on a soundbar listing?

Passthrough means the bar receives a video signal on an HDMI input, plays the audio itself, and sends the video out to the TV. Listing words include "HDMI input", "HDMI output", and "passthrough".

Do I need HDMI 2.1 for 4K HDR passthrough?

A listing that states an HDMI version names the support the bar has. The HDMI 2.2 page names 4K240 and 8K60 support. Many bars pass 4K HDR with the version they state on the maker's page; read that page for the specific version.

What if the listing does not say 4K or HDR?

Short titles often omit those words. Check the maker's page for the HDMI input count, the HDMI version, and the HDR format list.

Can I use ARC instead of passthrough?

Yes. Connect the source to the TV and let the audio return to the bar over ARC or eARC. The bar's HDMI input is then unused, but the audio path still works.

Does a soundbar with two HDMI inputs pass HDR from both?

Read the listing for the HDR format names and the input count. The maker's page states whether both inputs accept the same video formats.

What should I check on delivery for passthrough?

Keep the box and manual, and read the manual for the port labels before connecting. A missing cable or a port label difference is a question for the maker's support page.