A facade. A way for record companies to get rich off the same music that gullible techsuckers already own. Don't buy into the bullshit about better sound quality, especially of SACDs that were culled from digitally recorded originals and not master tapes. All CDs that are SACD are copy-protected so you can't play them on your PC, you can't rip them, and you can't upload them -- no back-ups, which is just what they want.
Austin: Hey, is that an SACD?
Me: Uh, no, I just turned my treble up.
Super Audio Compact Disc. New media format developed by Sony and Philips that uses DSD (Direct Stream Digital) for audio rather than PCM (pulse-code modulation). Supports high-bitrate recording at 2.8 MHz and up to 5.1 channels of information. Greater dynamic range and frequency response than a regular CD. All SACDs required to have 2-channel DSD layer. Some are "hybrid" discs and have a PCM layer compatible with regular CD players.
Pink Floyd's "Dark Side of the Moon" was re-released in multichannel SACD format in 2003.