This is a summary of the best intro made by thx and dolby. Enjoy it.
THX and Dolby sound intro sound test
Dolby Digital True HD 7.1 - Spheres- Intro (HD 1080p)
THX Test. 7.1 Dolby True HD
DOWNLOAD and INSTALL Dolby Home Theater v4 *HD*
Dolby Atmos surround sound technology
[HD] Dolby Digital - Countdown Intro (With Download)
5.1 Dolby Surround Test