Beyond Surround Sound
For decades, cinematic audio was ‘channel-based.’ A sound mix was created for a specific number of speakers (e.g., 5.1 or 7.1), and sounds were assigned to those fixed channels. DTS:X, along with its main competitor Dolby Atmos, represents a fundamental shift to ‘object-based’ audio. In this paradigm, a sound is no longer just a signal sent to the ‘left surround’ speaker. Instead, it is treated as a distinct ‘audio object’ with associated metadata that describes its intended position and movement within a three-dimensional space. A sound object could be a buzzing fly, a speeding bullet, or a line of dialogue. When the movie is played, the DTS:X processor in an A/V receiver or soundbar reads this metadata and renders the audio in real-time, placing the ‘object’ in the correct location based on the listener’s actual speaker layout. This frees the mix from the constraints of a specific channel configuration and allows for a more accurate and scalable immersive experience.
DTS:X vs. Dolby Atmos
The landscape of immersive audio is largely a duopoly between DTS:X and Dolby Atmos. While they share the same object-based philosophy, they have some key differences in their approach and implementation:
| Feature | DTS:X | Dolby Atmos |
|---|---|---|
| Speaker Layout | Highly flexible. It does not require a specific speaker layout and can adapt to nearly any configuration, including setups without dedicated height speakers. | While also flexible, it has a stronger recommendation for overhead speakers (or up-firing modules) to achieve the intended effect. |
| Licensing | Generally considered to have a more open and less costly licensing model for hardware manufacturers. | Has a more established and widespread licensing program, leading to broader initial adoption. |
| Dialogue Control | Features a ‘Dialog Control’ function that allows users to adjust the volume of dialogue independently from the rest of the soundtrack, if enabled in the mix. | Similar functionality is available but is often implemented under different names like ‘Dialogue Enhancement’. |
| Market Presence | Very prominent in the home theater market, featured on a vast number of 4K UHD Blu-ray discs and A/V receivers. | Dominant in the commercial cinema space and has extremely wide support across streaming services like Netflix and Apple TV+. |
The IMAX Enhanced Program
A significant extension of the DTS:X ecosystem is the IMAX Enhanced program. This is a certification standard for both hardware (TVs, projectors, receivers) and content. For a film to be released as IMAX Enhanced, it must meet a strict set of criteria for both video and audio. The audio component is delivered via a special variant of the DTS:X codec that is designed to recreate the full dynamic range and immersive impact of an IMAX theatrical mix in a home environment. This partnership provides a premium, branded experience for home cinema enthusiasts seeking to replicate the power and scale of an IMAX presentation.