套用示例（圖）
Dolby Digital EX
杜比Digital EX就是在杜比5.1基礎上增加了一個後置環繞，增加的我們可以認為是“後中置”，這樣完成了從杜比5.1六聲道向杜比6.1七聲道的升級。有了這個後置中央聲道，我們欣賞大片時可以用身心感受後置左右聲道之間的重要過渡和暗示信號，從而體會到真實的現場感，用一個詞來形容就叫做身臨其境。
目前支持杜比數字EX的影片已有不少，如《飄流者》《角鬥士》《星戰前轉》《魔戒指環王》等等等等……個人覺得新格式普及得非常快，就像AC-3取代杜比定向邏輯、DTS大量湧現一樣，沒有一點超前觀念是不行的。當然，這個後置聲道不僅僅在大片中才起作用，一些新的遊戲配合Audigy2的EAX ADVANCED HD技術讓背景聲更豐富，定位更精準，這些遊戲包括《Unreal Tournament2003》（虛幻競技場2003）《Tomb Raider: The Angel of Darkness, Neverwinter Night》（古墓麗影：黑暗天使）很多…… 。
英文介紹
Dolby Digital EX takes the Dolby Digital 5.1-channel setup one step further with an additional center surround channel (reproduced through one or two speakers) for extra dimensional detail and an enveloping surround sound effect.
Feature films originally released in Dolby Digital Surround EX (the cinema version) carry the encoded extra surround channel in their subsequent DVD releases, as well as onto 5.1-channel digital satellite and TV broadcasts. If your home theater system has a receiver or preamp/processor with Dolby Digital EX decoding and speakers to support 6.1 or 7.1 playback, you can hear Surround EX soundtracks as they were meant to be heard, with the increased realism created by the extra surround channel. As in the cinema, with regular 5.1-channel Dolby Digital playback no sonic information is lost (although you'll miss out on the heightened realism).
Current Dolby Digital Surround EX soundtracks contain a digital flag that can automatically activate the EX decoding in a receiver or preamp/processor. For titles released prior to late 2001, however, you need to turn on the EX decoding manually.
