Dolby Digital vs Dolby Digital Plus: Complete Comparison (2026)

Updated July 2026. Dolby Digital and Dolby Digital Plus are both surround sound audio formats developed by Dolby Laboratories. Dolby Digital is the older standard, introduced in 1992. Dolby Digital Plus is a newer, more efficient version introduced in 2005. The main difference is that Dolby Digital Plus supports higher bitrates, more audio channels, and better sound quality at the same bitrate. This article explains the differences in detail and helps you decide which format to use.

Dolby Digital supports up to 5.1 channels of audio at bitrates up to 640 kbps. Dolby Digital Plus supports up to 7.1 channels at bitrates up to 6 Mbps. Dolby Digital Plus is also more efficient, meaning it can deliver better sound quality than Dolby Digital at the same bitrate. Dolby Digital Plus is used in streaming services like Netflix and Amazon Prime Video, while Dolby Digital is used in DVDs, broadcast television, and older content.

What Is Dolby Digital?

Dolby Digital, also known as AC-3, is a lossy audio compression format developed by Dolby Laboratories. It was introduced in 1992 for use with电影 film prints and later adopted for DVDs, broadcast television, and video games. Dolby Digital supports up to 5.1 channels of audio: left, center, right, left surround, right surround, and a subwoofer channel for low-frequency effects. The bitrate ranges from 64 kbps for a single mono channel to 640 kbps for full 5.1 surround sound. Dolby Digital is still widely used today, particularly in broadcast television and older media formats. The audio quality of Dolby Digital at 448 kbps is generally considered good for most applications, but it can sound compressed compared to lossless formats or higher-bitrate lossy formats.

What Is Dolby Digital Plus?

Dolby Digital Plus, also known as E-AC-3, is an enhanced version of Dolby Digital introduced in 2005. It supports up to 7.1 channels of audio at bitrates up to 6 Mbps. Dolby Digital Plus also supports higher sampling rates, improved coding efficiency, and additional features like metadata for dynamic range control and dialog normalization. Dolby Digital Plus is used in streaming services, Blu-ray discs, and some broadcast applications. The improved efficiency of Dolby Digital Plus means it can deliver the same audio quality as Dolby Digital at about half the bitrate, or significantly better quality at the same bitrate. Dolby Digital Plus also supports object-based audio, which allows sound mixers to place audio objects in a three-dimensional space rather than assigning them to specific channels.

Key Differences Between Dolby Digital and Dolby Digital Plus

The main differences between Dolby Digital and Dolby Digital Plus are channel support, bitrate, efficiency, and compatibility. Dolby Digital supports up to 5.1 channels at up to 640 kbps. Dolby Digital Plus supports up to 7.1 channels at up to 6 Mbps. Dolby Digital Plus is about twice as efficient as Dolby Digital, meaning it can deliver the same quality at half the bitrate. Dolby Digital Plus also supports higher sampling rates, up to 96 kHz compared to Dolby Digital’s 48 kHz. Dolby Digital Plus supports object-based audio, while Dolby Digital does not. The main disadvantage of Dolby Digital Plus is compatibility. Dolby Digital is supported by virtually all audio equipment, while Dolby Digital Plus requires newer equipment. Most modern AV receivers and soundbars support both formats, but older equipment may only support Dolby Digital.

Which Format Should You Use?

The choice between Dolby Digital and Dolby Digital Plus depends on your equipment and content source. If you’re watching content from streaming services like Netflix, Amazon Prime Video, or Disney Plus, you’re already using Dolby Digital Plus. If you’re watching DVDs or broadcast television, you’re using Dolby Digital. If you’re setting up a home theater system, choose equipment that supports Dolby Digital Plus for the best compatibility with modern content. If you have older equipment that only supports Dolby Digital, it will still work with Dolby Digital Plus content because the format includes a backward-compatible Dolby Digital core. This means Dolby Digital Plus content can be played on Dolby Digital equipment, though you’ll only get Dolby Digital quality.

Frequently Asked Questions

Is Dolby Digital Plus better than Dolby Digital?

Yes, Dolby Digital Plus is objectively better than Dolby Digital. It supports more channels, higher bitrates, and better efficiency. It also supports object-based audio for a more immersive experience.

Is Dolby Digital Plus backward compatible?

Yes, Dolby Digital Plus includes a backward-compatible Dolby Digital core. This means Dolby Digital Plus content can be played on Dolby Digital equipment, though you’ll only get Dolby Digital quality.

Do I need Dolby Digital Plus for streaming?

Most streaming services use Dolby Digital Plus for their surround sound content. If you have a modern AV receiver or soundbar, it will support Dolby Digital Plus. Older equipment will fall back to the Dolby Digital core.

Can I hear the difference between Dolby Digital and Dolby Digital Plus?

The difference in audio quality is subtle on most home theater systems. On high-end systems with good speakers, the difference is more noticeable. Dolby Digital Plus sounds cleaner, more detailed, and has better surround localization.

Written by James Core, technology writer and audio specialist. Updated July 2026.

Bitrate Comparison: Dolby Digital vs Dolby Digital Plus

Bitrate is one of the most important factors in audio quality. Dolby Digital supports bitrates from 64 kbps for a single mono channel to 640 kbps for full 5.1 surround sound. The most common bitrate for Dolby Digital 5.1 is 448 kbps, which is used on DVDs and broadcast television. Some DVD releases use 384 kbps, while Blu-ray releases use 640 kbps. Dolby Digital Plus supports bitrates from 32 kbps to 6 Mbps. Streaming services typically use Dolby Digital Plus at bitrates between 192 kbps and 768 kbps for 5.1 content. The higher efficiency of Dolby Digital Plus means that 192 kbps Dolby Digital Plus sounds approximately equivalent to 384 kbps Dolby Digital. At 768 kbps, Dolby Digital Plus sounds significantly better than any Dolby Digital bitrate. The perceived quality difference depends on your audio equipment and your hearing. On a basic soundbar, the difference between Dolby Digital at 448 kbps and Dolby Digital Plus at 768 kbps may be subtle. On a high-end surround sound system with quality speakers, the difference is more noticeable, with Dolby Digital Plus providing cleaner highs, tighter bass, and better surround channel separation.

Channel Configuration Options

Dolby Digital supports mono, stereo, and 5.1 channel configurations. The 5.1 configuration includes left, center, right, left surround, right surround, and a subwoofer channel. Dolby Digital Plus supports all of these configurations plus 6.1, 7.1, and even higher configurations with additional height channels. The 7.1 configuration adds two additional surround channels, providing more precise sound placement behind the listener. Dolby Digital Plus also supports Dolby Atmos, which adds height channels for a three-dimensional sound experience. Dolby Atmos with Dolby Digital Plus can support up to 7.1.4 channels (seven surround channels, one subwoofer, and four height channels). Dolby Digital cannot support Dolby Atmos or height channels. For most home theater setups, 5.1 or 7.1 is sufficient. If you have a Dolby Atmos setup with ceiling speakers, you need Dolby Digital Plus or Dolby TrueHD to get the height channel information.

Compatibility and Equipment Requirements

Dolby Digital is supported by virtually every audio device made since the late 1990s. This includes DVD players, Blu-ray players, game consoles, AV receivers, soundbars, and TVs. Dolby Digital Plus requires newer equipment. Most AV receivers and soundbars made since 2010 support Dolby Digital Plus. Streaming devices like Roku, Apple TV, and Fire TV support Dolby Digital Plus. Game consoles like PlayStation 5 and Xbox Series X support Dolby Digital Plus. If you have older equipment that only supports Dolby Digital, it will still work with Dolby Digital Plus content because the format includes a backward-compatible Dolby Digital core. However, you’ll only get Dolby Digital quality from the Dolby Digital Plus stream. To get the full benefit of Dolby Digital Plus, you need equipment that supports it. When shopping for new audio equipment, look for the Dolby Digital Plus logo or check the specifications to confirm support.

Practical Applications and Content Availability

The availability of Dolby Digital and Dolby Digital Plus content varies by medium. DVDs use Dolby Digital exclusively. Blu-ray discs can use both Dolby Digital and Dolby Digital Plus, though most use Dolby TrueHD or DTS-HD Master Audio for high-quality audio. Streaming services like Netflix, Amazon Prime Video, Disney Plus, and Apple TV Plus use Dolby Digital Plus for their surround sound content. Broadcast television uses Dolby Digital for both standard and high-definition content. Video game consoles use Dolby Digital for games and Dolby Digital Plus for streaming apps. For most viewers, the majority of surround sound content consumed today is in Dolby Digital Plus format through streaming services. If you have a modern home theater system, you’re already benefiting from Dolby Digital Plus even if you didn’t realize it. The format is widely supported and provides excellent audio quality for streaming content.

My Recommendation for Home Theater Setup

Based on my experience setting up home theater systems, I recommend choosing equipment that supports Dolby Digital Plus. Most modern AV receivers and soundbars support it, so this is rarely a limiting factor. If you have older equipment that only supports Dolby Digital, don’t worry about upgrading just for the audio format difference. The quality improvement from Dolby Digital to Dolby Digital Plus is noticeable but not dramatic. Focus on other aspects of your system like speaker quality, room acoustics, and proper speaker placement first. These factors have a much larger impact on your listening experience than the difference between Dolby Digital and Dolby Digital Plus. If you’re building a new system from scratch, choose equipment that supports Dolby Digital Plus and Dolby Atmos for the best future compatibility.

Object-Based Audio: Dolby Atmos and Beyond

The most significant advantage of Dolby Digital Plus over Dolby Digital is its support for object-based audio through Dolby Atmos. Object-based audio represents a fundamental shift in how surround sound is created and delivered. Traditional channel-based audio like Dolby Digital assigns sounds to specific channels. The sound mixer decides which speaker each sound comes from, and that’s how it’s delivered to your system. Object-based audio works differently. The sound mixer places audio objects in a three-dimensional space, and your AV receiver or soundbar uses its speaker configuration to render those objects in the correct position. This means the same Dolby Atmos mix can work with a 5.1 system, a 7.1 system, or a system with height speakers, and the audio is rendered optimally for each configuration. Dolby Atmos with Dolby Digital Plus can deliver this object-based audio experience over streaming services, making it accessible to a wide audience. The result is a more immersive and realistic sound experience that adapts to your specific speaker setup rather than being locked into a specific channel configuration.

Setting Up Your System for Dolby Digital Plus

Setting up your system for Dolby Digital Plus is straightforward if you have compatible equipment. First, make sure your AV receiver or soundbar supports Dolby Digital Plus. Most modern equipment does. Connect your streaming device, Blu-ray player, or game console to your AV receiver or soundbar using HDMI. Make sure HDMI-CEC is enabled so your devices can communicate with each other. In your streaming device’s audio settings, select Dolby Digital Plus or Auto. Your device will automatically detect the best audio format supported by your equipment. If you have a Dolby Atmos setup, make sure your AV receiver is set to the correct Dolby Atmos mode. Some receivers require you to manually select the Dolby Atmos mode for each input. If you’re using a soundbar with Dolby Atmos, make sure the soundbar is set to the correct audio mode. Some soundbars have a dedicated Dolby Atmos mode that needs to be selected manually. Once everything is set up correctly, you’ll get the best possible audio quality from your streaming content.

Understanding the differences between Dolby Digital and Dolby Digital Plus helps you make informed decisions about your home theater setup and ensures you’re getting the best possible audio quality from your content.

Nam Sun-Hi

Writer

Hi, I'm Nam Sun-Hi. My first name means: "One with a joyful demeanor." I'm a Korean student and author at FindDiffer.com. I spend all my time either writing or studying. I love learning new things, and I think that's why I enjoy writing so much - it's a way of learning more about the world around me.

View all posts by Nam Sun-Hi →