From sony website....

What is the technology behind SACD?

The sound of SACD comes directly from Direct Stream Digital (DSD) recording technology. DSD's simplified mechanism for recording and playback results in a frequency response of over 100kHz and a dynamic range over 120dB across the audible frequency range. DSD increases the resolution of music by more closely following the original wave form of the music, which results in music reproduction that is remarkably pure and faithful to the original. For additional information concerning the technology behind SACD, visit Sony Electronics SACD.

What are the benefits of SACD?
In addition to exceptional sound quality through the DSD system, the SACD format can accommodate more than four times the information of the current CD format. With this extra capacity, a standard Super Audio CD will provide space for 2-channel stereo data, as well as an area for up to 6-track multi-channel data, storage capacity for text and images, disc variations, copyright protection and much more.


so basically, if u put aside sound quality, only major advantage is 6-channel sound, which might be cool if album was mixed as 6 chan..


stoney