Home Theater & Entertainment Audio 36 36 people found this article helpful The Audyssey DSX Surround Sound Format Adding width and height to surround sound by Robert Silva Writer Robert Silva has written about audio, video, and home theater topics since 1998. Robert has written for Dishinfo.com, and made appearances on the YouTube series Home Theater Geeks. our editorial process Facebook Twitter LinkedIn Robert Silva Updated on September 10, 2020 Audio Speakers Stereos & Receivers Tweet Share Email Yamaha Presence and Dolby ProLogic IIz were the first audio processing formats to introduce the concept of adding 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 a more 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, is also designed to enhance 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 in 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 already present in 5.1 or 7.1 channel soundtracks and directs them to front height or wide channels, enabling a more 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, but you have to choose between using front height or wide speakers. In a 9.1 channel DSX setup, the speaker arrangement is as follows: Front LeftFront Left HeightFront CenterFront RightFront Right HeightWide LeftWide RightSurround LeftSurround 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, you would 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, your speaker setup would consist of Front Left, Front Center, Front Right, Left and Right Wide, and Surround Left and Right and Subwoofer. The wide speaker setup option fills in the gaps between the surround and front speakers, as well as adding a larger front soundstage. Audyssey DSX and DSX 2 Home Theater receivers that are equipped with Audyssey DSX have the ability to up-mix 5.1 or 7.1 channel content, while 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 Although there are some home theater receivers equipped with the Audyssey DSX or DSX2 surround sound formats, with the introduction of the 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 happen to buy a used one that has either DSX or DSX2, it can still be used to expand your surround sound listening experience over standard 5.1 or 7.1, as it does not require specific encoding on the source end.