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The Audyssey DSX Surround Sound Format

Adding width and height to surround sound

Dolby ProLogic IIz and Yamaha Presence were the first audio processing formats to add front height channels to a surround sound setup. DTS provided a similar option to DTS Neo:X surround sound processing for short. The purpose of these formats is to provide an immersive surround sound experience.

Audyssey, a manufacturer of several automatic speaker setups and room correction systems, has followed suit. Audyssey DSX, which stands for Dynamic Surround Expansion, also enhances the surround sound experience.

Audyssey

Dynamic surround expansion basics

Audyssey DSX adds the option to add front-height or wide-channel speakers to some home theater receivers.

Wide-channel speakers should be placed between the left and right surround speakers and the front left and right speakers. This option eliminates sound interruptions that can occur between the front and surround speakers, especially in a larger room.

Similar to Yamaha Presence and Dolby ProLogic IIz, DSX does not require studios to mix soundtracks specifically for the expanded sound field. The DSX processor searches for cues found in 5.1 or 7.1 channel sound recordings and directs them to front height or wide channels, providing an immersive 3D listening environment.

Channel and speaker settings

To fully experience Audyssey DSX, you need a 9.1 or 11.1 channel home theater receiver with Audyssey DSX enabled. However, DSX can be adapted for use in 7.1 channel configurations. Still, you have to choose between front or wide speakers.

In a 9.1 channel DSX configuration, the speaker layout is as follows:

  • left front
  • Left front height
  • front center
  • right front
  • right front height
  • big left
  • big right
  • left fencing
  • turn right

Large left and right speakers are placed between the front and surround speakers. Channel .1 is reserved for subwoofer.

For 11.1 channel configurations, add surround back left and surround right rear speakers.

If it’s limited to a 7.1 channel setup, you can eliminate front height or wide speakers. If you have to choose, Audyssey recommends adding large speakers instead of front speakers.

  • For a 7.1 channel setup, if you choose height, the speaker layout will be front left, front height, front center, front right, front height, surround left and right, and subwoofer. Sounds from tall speakers reflect towards the listening position, giving the feel of certain sounds coming from above.
  • If you choose the 7.1 channel wide option, the speaker configuration will consist of front left, front center, front right, left and right wide, surround left and right and subwoofer. A wide choice of speaker configurations bridges the gaps between the surround and front speakers and adds a larger front soundstage.

Audyssey DSX and DSX 2

Home theater receivers equipped with Audyssey DSX can mix 5.1 or 7.1 channel content. DSX 2 adds the ability to mix 2.0, 5.1 or 7.1 channel content in an expanded surround sound environment.

Underline

Some home theater receivers are equipped with the Audyssey DSX or DSX2 surround sound formats. With the introduction of Dolby Atmos, DTS:X and Auro3D Audio, home theater receiver manufacturers have moved away from Dolby ProLogic IIz and Audyssey DSX/DSX2 options. However, Yamaha still includes the Presence surround sound processing option in some home theater receivers.

If you have a home theater receiver or buy one that was used with the DSX or DSX2, it can be used to expand your surround sound listening experience beyond the 5.1 or 7.1 standard as it doesn’t require special coding on the source end.


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The Audyssey DSX Surround Sound Format

Adding width and height to surround sound

Dolby ProLogic IIz and Yamaha Presence were the first audio processing formats that added front height channels into a surround sound setup. DTS briefly provided a similar option with its DTS Neo:X surround sound processing. The goal of these formats is to provide an immersive surround sound experience.

Audyssey, the maker of several automatic speaker setup and room correction systems, followed up with its own system. Audyssey DSX, which stands for Dynamic Surround Expansion, also enhances the surround sound experience.

Audyssey Dynamic Surround Expansion Basics

Audyssey DSX adds the option on select home theater receivers for adding front height or wide channel speakers.

Wide channel speakers are meant to be placed between the left and right surround speakers and the left and right front speakers. This option eliminates sound dips that can occur between the front and surround speakers, especially in a larger room.

Similar to Yamaha Presence and Dolby ProLogic IIz, DSX doesn’t require studios to mix soundtracks specifically for the expanded sound field. The DSX processor looks for cues present in 5.1 or 7.1 channel soundtracks and directs them to the front height or wide channels, enabling an enveloping 3D listening environment.

Channel and Speaker Configurations

To fully experience Audyssey DSX, you need a 9.1 or 11.1 channel home theater receiver that is Audyssey DSX-enabled. However, DSX is adaptable for use in 7.1 channel configurations. Still, you must choose between using front height or wide speakers.

In a 9.1 channel DSX setup, the speaker arrangement is as follows:

Front left
Front left height
Front center
Front right
Front right height
Wide left
Wide right
Surround left
Surround right

The wide left and wide right speakers are placed on the sides between the front and surround speakers. The .1 channel is reserved for the subwoofer.

For 11.1 channel setups, add surround back left and surround back right speakers.

If limited to a 7.1 channel setup, you can eliminate either the front height or wide speakers. Should you have to choose, Audyssey recommends adding wide speakers over front height speakers.

For a 7.1 channel setup, if you opt for height, the speaker layout would be front left, front height, front center, front right, front height, surround left and right, and subwoofer. The sounds from the height speakers project toward the listening position, giving the sensation of certain sounds coming from overhead.
If you opt for the wide option within 7.1 channels, the speaker setup would consist of front left, front center, front right, left and right wide, surround left and right, and subwoofer. The wide speaker setup option fills the gaps between the surround and front speakers and adds a larger front soundstage.
Audyssey DSX and DSX 2

Home theater receivers that are equipped with Audyssey DSX can up-mix 5.1 or 7.1 channel content. DSX 2 adds the ability to up-mix 2.0, 5.1, or 7.1 channel content into the expanded surround sound environment.

The Bottom Line

Some home theater receivers are equipped with the Audyssey DSX or DSX2 surround sound formats. With the introduction of Dolby Atmos, DTS:X, and Auro3D Audio, home theater receiver makers have moved away from the Dolby ProLogic IIz and Audyssey DSX/DSX2 options. However, Yamaha still includes its Presence surround sound processing option on some of its home theater receivers.

If you have a home theater receiver or buy a used one with either DSX or DSX2, it can be used to expand your surround sound listening experience over standard 5.1 or 7.1, as it doesn’t require specific encoding on the source end.

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