You have just bought a new AV receiver, the box says “Dolby Atmos and DTS:X compatible,” and you have no idea what either of those means beyond “surround sound but fancier.” Both are object-based audio formats that add height channels to your home cinema — sounds come from above you as well as around you. But they are not identical, they are not always interchangeable, and choosing the right one (or knowing when it does not matter) saves you from overthinking speaker placement for the next six months.
In This Article
- What Object-Based Audio Actually Means
- Dolby Atmos Explained
- DTS:X Explained
- Key Differences Between Atmos and DTS:X
- Speaker Setup Requirements
- Content Availability in the UK
- Which Sounds Better
- AV Receivers That Support Both
- Do You Actually Need Either
- Frequently Asked Questions
What Object-Based Audio Actually Means
Traditional surround sound (5.1, 7.1) assigns sounds to fixed channels — front left, centre, rear right, and so on. The mixer decides which speaker each sound comes from, and every home system with that channel count plays it identically.
The Old Way: Channel-Based
In a 5.1 mix, a helicopter flying overhead gets split between your front and rear speakers with some volume trickery to suggest height. It works, but it is a compromise — the sound never actually comes from above because there are no speakers above.
The New Way: Object-Based
Dolby Atmos and DTS:X treat individual sounds as “objects” positioned in 3D space. The helicopter is not assigned to “front left speaker at 70% volume” — it is assigned coordinates (x, y, z) in a virtual room. Your AV receiver then calculates which of YOUR specific speakers should play what, at what volume, to recreate that position in YOUR room. This means the same mix sounds correct whether you have 5.1.2, 7.1.4, or even a soundbar with upfiring drivers.
Why Height Matters
The addition of overhead speakers (or upfiring drivers that bounce sound off the ceiling) creates a genuine sense of three-dimensional space. Rain falls from above. Aeroplanes pass over your head. Ambient sounds in a forest scene come from everywhere rather than just around you. Once you hear it properly set up, flat 5.1 feels like watching television through a letterbox.
Dolby Atmos Explained
Dolby Atmos launched in cinemas in 2012 (the first film was Brave) and arrived in home systems in 2014. It is the more established format, with broader content support and greater industry momentum.
How Atmos Works at Home
An Atmos signal contains up to 128 simultaneous audio objects plus a “bed” of traditional channel-based audio underneath. Your AV receiver decodes these objects and renders them to your specific speaker layout. The system scales from a 5.1.2 setup (two height speakers) up to 7.1.4 (four height speakers) or beyond in commercial installations.
The 7.1.4 Notation
Atmos speaker layouts use three numbers: floor-level speakers, subwoofers, and overhead/height speakers. So 5.1.2 means five ear-level speakers, one subwoofer, and two height channels. The minimum for Atmos is 5.1.2 — anything less and the receiver downmixes to standard surround.
Atmos Licensing
Dolby charges manufacturers a licensing fee for Atmos decoding, which gets passed to you in the receiver price. Every AV receiver sold in the UK above about £300 includes Atmos decoding. Below that price point, you are looking at DTS:X only or neither.
DTS:X Explained
DTS:X launched in 2015 as a direct competitor to Dolby Atmos. It uses the same fundamental concept — object-based audio with height information — but with different technical implementation and licensing terms.
How DTS:X Differs Technically
DTS:X is codec-agnostic regarding speaker layout. While Atmos requires a minimum configuration (5.1.2), DTS:X adapts to whatever you have — even a 3.1 system without any height speakers. It remaps objects to your available speakers regardless of how few (or many) you own. This flexibility is its biggest selling point.
Open Standard Approach
DTS charges lower licensing fees than Dolby, which theoretically means cheaper hardware. In practice, almost every modern AV receiver includes both formats anyway, so the cost difference is invisible to consumers. Where it matters more is content creation — lower licensing encourages smaller studios and streaming services to adopt DTS:X alongside Atmos.
DTS:X Pro
The professional tier supports up to 32 speaker locations versus DTS:X’s standard 11.1 channels. Overkill for home use but relevant if you are building a dedicated cinema room with 20+ speakers. Available on higher-end Denon and Marantz receivers.
Key Differences Between Atmos and DTS:X
Content Library
- Dolby Atmos — supported on Netflix, Disney+, Amazon Prime Video, Apple TV+, Sky Q/Glass, 4K Blu-ray. Thousands of titles available.
- DTS:X — primarily physical media (4K Blu-ray). Very limited streaming support. No Netflix, no Disney+, no Amazon Prime.
This is the decisive difference for most UK users. If you stream 90% of your content, Atmos wins by default because DTS:X is simply not available on the major platforms. DTS:X shines on physical Blu-ray discs where it often sounds marginally better due to higher bitrates.
Minimum Speaker Requirements
- Dolby Atmos — requires minimum 5.1.2 (7 speakers + sub) for the height effect to activate
- DTS:X — works with any speaker count, remapping objects to available channels. Even a 2.1 system gets object-based processing.
Bitrate and Quality
- Dolby Atmos via streaming — delivered inside Dolby Digital Plus at 768kbps (lossy) or Dolby TrueHD on Blu-ray (lossless)
- DTS:X via Blu-ray — delivered inside DTS-HD Master Audio (lossless). No streaming option means it is always lossless when available.
On physical media, DTS:X typically offers slightly higher bitrate than streaming Atmos. On disc-based Atmos (TrueHD), both are lossless and quality differences are negligible.
Speaker Setup Requirements
Atmos Minimum: 5.1.2
Five ear-level speakers (front left, centre, front right, surround left, surround right), one subwoofer, and two overhead speakers. The height speakers can be ceiling-mounted, placed on top of existing speakers angled upward (Atmos-enabled modules), or upfiring drivers in a soundbar.
Optimal Setup: 7.1.4
Seven ear-level speakers (adding rear surrounds), one subwoofer, and four overhead speakers (front height and rear height). This gives Atmos the most separation for overhead effects. Diminishing returns exist beyond this for most rooms — your room size and acoustics matter more than speaker count past 7.1.4.
Ceiling Speakers vs Upfiring
- Ceiling-mounted — the gold standard. Direct sound from above. Requires installation (drilling, running cables). Best results.
- Upfiring modules — sit on top of existing speakers, fire sound upward to bounce off the ceiling. No installation needed but effectiveness depends entirely on ceiling height (2.4-2.7m ideal) and material (flat plasterboard good, textured Artex bad, vaulted ceilings hopeless).
- Soundbar upfiring — the most compromised option but convenient. Works in smaller rooms with flat, low ceilings. Our soundbar guide covers which models handle Atmos convincingly.
DTS:X Is Less Fussy
DTS:X adapts to whatever speakers you have. If you only manage 5.1 without height speakers, it still processes objects and places them optimally within your available layout. You lose the overhead element but gain better object positioning than standard 5.1 decoding.
Content Availability in the UK
Streaming (Atmos Dominates)
- Netflix — hundreds of Atmos titles (requires Premium plan)
- Disney+ — extensive Atmos library (Marvel, Star Wars, Pixar)
- Apple TV+ — all original content in Atmos
- Amazon Prime Video — growing Atmos selection
- Sky Q / Sky Glass — Atmos on selected Sky Originals and movies
- DTS:X streaming — no major UK platform offers this
Physical Media (Both Available)
4K Ultra HD Blu-ray discs often include both Dolby Atmos (in TrueHD) and DTS:X tracks — you choose which one to play. Some discs only have one or the other. Check the disc specifications before purchasing if you have a format preference.
Gaming
- Xbox Series X/S — supports Dolby Atmos for headphones and home theatre via HDMI
- PS5 — uses Sony’s proprietary Tempest 3D Audio instead (neither Atmos nor DTS:X via speakers, though HDMI passthrough works with disc-based content)
- PC — Dolby Atmos via the Dolby Access app (one-off £14 purchase), DTS:X via DTS Sound Unbound
Which Sounds Better
The honest answer: in controlled listening tests with matched-quality source material, most people cannot tell them apart. Both achieve the same goal (3D positioning of audio objects) through slightly different mathematical approaches.
Where Atmos Edges Ahead
- Streaming quality — being the only option on streaming platforms means it is the only way to get object-based audio for 90% of content
- Ecosystem integration — Apple, Amazon, Sonos, and most smart speakers support Atmos natively
- More titles mixed specifically for it — studios prioritise Atmos because it has wider distribution
Where DTS:X Edges Ahead
- Lossless quality on Blu-ray — consistently high bitrate with no streaming compression
- Flexibility — works with fewer speakers and still sounds good, rather than falling back to flat surround
- No minimum speaker requirement — processes objects regardless of your setup limitations
For a detailed breakdown of setting up your home cinema on a budget, including receiver selection, see our dedicated guide.
AV Receivers That Support Both
Every modern AV receiver above £300 supports both Dolby Atmos and DTS:X. You do not need to choose — buy any of these and play whichever format your content provides.
Budget: Denon AVR-X1800H (about £450)
7.2 channel processing with Atmos and DTS:X support. Handles 5.1.2 speaker layouts (the practical ceiling for most UK living rooms). HDMI 2.1 for gaming, built-in streaming via HEOS, and room correction with Audyssey MultEQ. The sweet spot for most buyers.
Mid-Range: Yamaha RX-V6A (about £550)
7.2 channels, Atmos and DTS:X, plus Yamaha’s excellent YPAO room correction. Cinema DSP modes for rooms where speaker placement is compromised. Musicality is Yamaha’s strength — if you use the system for music as much as film, this is the better choice.
Premium: Denon AVR-X3800H (about £1,100)
9.4 channel processing supporting 7.1.4 Atmos layouts natively. Audyssey MultEQ XT32 (the best auto-calibration in the business), dual subwoofer outputs, and Dirac Live upgrade path. For dedicated cinema rooms where you want the full 7.1.4 experience without compromise. Works well with properly positioned HDMI cables running through walls.
Do You Actually Need Either
You Probably Do If
- You have (or plan to install) ceiling speakers or a soundbar with upfiring drivers
- You watch a lot of action films, sci-fi, or nature documentaries where spatial audio adds genuine immersion
- You game on Xbox or PC where spatial audio gives competitive advantage in positioning enemies
- You have already invested in a proper speaker setup and want to extract more from it
You Probably Do Not If
- Your “home cinema” is a TV with its built-in speakers — no amount of format support helps here
- You primarily watch news, sport, or reality TV where spatial audio adds nothing meaningful
- Your room is oddly shaped, has vaulted ceilings, or prevents any form of height speaker placement
- You are happy with good stereo or basic 5.1 — which is still excellent for most content
The honest recommendation: if you already have 5.1 surround and enjoy it, adding two ceiling speakers (or Atmos-enabled upfiring modules at about £150-200 per pair) to unlock overhead effects is a worthwhile upgrade. If you are starting from scratch, a quality What Hi-Fi? rated AV receiver with Atmos at 5.1.2 delivers 90% of the spatial audio benefit for reasonable investment.
Frequently Asked Questions
Can I switch between Atmos and DTS:X on the same disc? Yes — many 4K Blu-ray discs include both formats as separate audio tracks. Select your preference in the disc menu before playback starts, just as you would choose between English and French audio. Your receiver decodes whichever track you select.
Does Netflix Atmos sound as good as Blu-ray Atmos? No. Netflix delivers Atmos inside Dolby Digital Plus at up to 768kbps (lossy compression). Blu-ray delivers Atmos inside Dolby TrueHD (lossless). The difference is audible on good systems — Blu-ray Atmos has more dynamic range, cleaner transients, and better spatial separation. On a soundbar or modest system, most people would not notice.
Do I need special HDMI cables for Atmos? You need HDMI cables that support ARC (Audio Return Channel) for soundbar setups or eARC (Enhanced ARC) for full-quality lossless Atmos from disc players. Any cable labelled “Ultra High Speed HDMI” (HDMI 2.1) supports eARC. Standard High Speed cables support ARC but not eARC — which means lossy Atmos only.
Can Atmos work with wireless surround speakers? Some systems support this (Sonos Arc with Era 300 surrounds, Samsung Q-series soundbars with wireless rears). The height processing happens in the main unit, with wireless speakers handling surround duties. Results vary — wired speakers still outperform wireless for timing accuracy, but wireless is far more practical in UK living rooms where cable routing is awkward.
Is DTS:X being discontinued? No — DTS:X continues to be included on 4K Blu-ray releases and supported by all major AV receiver manufacturers. However, its absence from streaming platforms means its relevance shrinks as physical media declines. For disc collectors, DTS:X remains excellent. For streaming-only viewers, it is largely irrelevant.