DTS 5.1 vs DTS:X: Soundbar Surround Upgrade

What DTS 5.1 means on a soundbar

DTS 5.1 is a channel-based surround format. The audio is encoded into six discrete channels: front left, center, front right, surround left, surround right, and a subwoofer channel. A soundbar that supports DTS 5.1 plays those channels through its physical drivers, either directly or with virtual processing to place sounds around the room.

This format has been a home theater staple for decades because it is efficient and widely compatible. Most movies and streaming shows offer DTS 5.1 mixes, and even a best 2.1 soundbar can simulate the effects with digital processing. The limitation is that the audio is locked to those channels: if a helicopter flies overhead, the sound stays in the surround channels rather than moving up.

• Channel-based: each speaker gets a fixed signal
• Works with nearly any soundbar that decodes DTS
• No height information; overhead effects are simulated if at all

What DTS:X adds: object-based audio

DTS:X is an object-based format. Instead of sending sounds to predefined channels, the soundtrack is described as individual objects, each with its own position in three-dimensional space. The soundbar decodes those objects and assigns them to its available drivers, including upward-firing or side-firing speakers, to create a height layer that DTS 5.1 cannot produce.

This means a DTS:X soundtrack can place a raindrop above your head, a plane passing from front to back, or dialogue anchored exactly to the center of your screen regardless of your seating position. The soundbar's processor decides where to reproduce each object based on its driver layout, so a bar with more physical drivers can create a more convincing envelope. For a deeper look at how object-based audio compares to traditional channels, see our explanation of DTS:X vs Dolby Atmos.

How soundbars reproduce DTS:X

Soundbars achieve DTS:X in two ways: physically and mentally. A physical approach uses upward-firing drivers (often called up-firing) that bounce sound off your ceiling to create a height effect. A mental approach uses digital processing to virtualize height cues, which works but is less distinct.

If you want a true DTS:X experience, look for a soundbar with dedicated height channels. Many best 5.1 soundbars include up-firing speakers, while more ambitious models with rear speakers and additional channels, like those in our best 7.1 and up soundbars, place height effects even more accurately. The more drivers the bar has to distribute objects, the more lifelike the soundfield becomes.

Even without physical height drivers, any soundbar that decodes DTS:X will upmix the object data to its existing channels. The result is often more spacious than DTS 5.1, but it will not match the immersive ceiling layer of a bar with dedicated up-firing speakers. For a detailed look at how height channels work, read our guide to up-firing speakers in soundbars.

What you actually gain with DTS:X

The biggest gain is a sense of three-dimensional space. With DTS 5.1, sound is anchored to a fixed plane at ear level. DTS:X allows the soundbar to place effects above you, behind you, and anywhere in between. When watching a movie like a helicopter sequence or a rainstorm, the overhead cues make the action feel more immediate and enveloping.

You also benefit from better object placement. A dialog line that is intended to come from a specific spot, such as a whisper from the side, stays in that spot even as the camera moves, because the decoder tracks the object's coordinates. DTS 5.1 would have to pan the entire channel, which loses the precise anchor.

Finally, DTS:X is backward compatible. If a soundbar supports DTS:X, it can still play DTS 5.1 content perfectly. You do not lose anything by upgrading; you gain the ability to render the more advanced format when the source provides it. For more on how DTS:X compares to other object-based formats, see DTS:X vs Dolby Atmos on soundbars.

What you need to get DTS:X on a soundbar

To hear DTS:X on a soundbar, three things must align: the source (a disc, stream, or file) must contain a DTS:X soundtrack, the soundbar must have a DTS:X decoder, and the connection between your TV and soundbar must carry the bitstream without degrading it. HDMI is the standard interface for this because it has the bandwidth for high-quality multichannel audio. According to the HDMI Forum, the latest specification delivers higher bandwidth and next-gen Fixed Rate Link technology for optimal audio and video. That is why most DTS:X-capable soundbars rely on HDMI connections, not optical cables.

You also need to check how your TV passes audio. Many TVs transcode DTS signals, and some do not pass DTS:X at all. If your TV does not support bitstream passthrough for DTS:X, you will need a soundbar with an HDMI input or a source device that connects directly to the soundbar. For guidance on connections, see our HDMI ARC vs eARC article.

Wireless rear speakers can also affect the DTS:X experience. While they do not decode the format, they need enough bandwidth to carry the multichannel audio without lag. Bluetooth Classic, which is the radio protocol used for many wireless audio connections, can stream audio but has limited bandwidth for surround channels. Most soundbars use a proprietary wireless link for rear speakers, which is separate from standard Bluetooth. If you want to learn about the tradeoffs, read our piece on wireless rear vs wired speakers.

When DTS 5.1 is still enough

DTS 5.1 is perfectly adequate if you watch mostly broadcast TV, older DVDs, or content that does not carry object-based soundtracks. Many TV shows and standard Blu-rays use DTS 5.1, and a soundbar without height channels will replay those tracks just as faithfully as one with DTS:X. The format's simplicity also means it works reliably over any connection, including optical.

If you have a small room, a soundbar without up-firing speakers, or a tight budget, DTS 5.1 support is not a dealbreaker. The virtual surround processing on modern bars can still create a satisfying soundstage. Our best 2.1 soundbars and best 3.1 soundbars lists include models that handle DTS 5.1 well without the extra cost of height channels.

However, if you already have or plan to buy a soundbar with up-firing or side-firing drivers, choosing a model with DTS:X makes sense. The hardware is there to reproduce the height objects, and the format will use it to full effect. For a comparison of physical height channels versus virtual processing, see our article on Dolby Atmos versus virtual surround.

How to choose between DTS 5.1 and DTS:X soundbars

Decide based on how much object-based content you watch. If you buy 4K Blu-rays or stream from services that offer DTS:X (typically through physical media or high-end streaming), a DTS:X decoder is worth it. The same goes if you plan to build a system with rear speakers and height channels. If not, DTS 5.1 support is sufficient.

Also consider the physical driver layout. A soundbar labeled DTS:X that lacks up-firing speakers will still decode the format, but the height effects will be virtualized, which is a lesser experience. For a true upgrade, pair DTS:X with a bar that has dedicated height drivers, like many models in our best Dolby Atmos soundbars list (Atmos and DTS:X often share the same hardware).

Finally, check the audio inputs. DTS:X requires an HDMI connection that supports eARC or at least ARC with the correct audio format passthrough. If your TV cannot pass DTS:X, the soundbar will not receive the full signal. For more on this, see our guide to soundbar HDMI connections.

Remember that a soundbar's driver count and included subwoofer affect the overall experience more than the codec alone. Our buying guide for soundbars with subwoofers can help you find a model that balances DTS:X support with solid bass and clarity.

What to pick for your use

Questions

Will DTS:X sound better than DTS 5.1 on a soundbar without up-firing speakers?

Usually yes, because DTS:X decodes object data and can virtualize height cues, creating a more immersive soundfield than a fixed 5.1 mix. But the difference is smaller without physical height drivers. If the bar has no up-firing or side-firing speakers, DTS 5.1 might sound nearly as good.

Can a DTS:X soundbar play DTS 5.1 content?

Yes. DTS:X is backward compatible with all earlier DTS formats, including DTS 5.1. A DTS:X decoder will automatically fall back to channel-based playback when the source does not contain objects.

Do I need a special HDMI cable for DTS:X?

No special cable is required. Standard HDMI cables capable of carrying 4K video and high-bandwidth audio, such as Premium High Speed HDMI cables, will transmit DTS:X. The limiting factor is often the TV's audio passthrough, not the cable.

Is DTS:X more demanding on the soundbar's drivers?

It requires the soundbar to have a decoder that handles object-based audio and enough drivers to map those objects to physical positions. A bar with more drivers can place sounds more accurately, but even a basic DTS:X bar can render the format with virtual processing.

Should I choose DTS:X over Dolby Atmos?

Both are object-based, and many soundbars support both. The choice is usually dictated by the content you watch. Some discs support one but not the other. If a soundbar supports both, you cover all bases. Check our DTS:X vs Dolby Atmos article for a detailed comparison.

Will DTS:X work over an optical connection?

No. Optical cables do not have enough bandwidth for DTS:X, which requires HDMI. Some TVs may compress DTS:X into a lossy format over optical, but the full object-based experience needs HDMI or a direct source connection.