A new audio format developed by Sony and Philips. This takes on DVD Audio by offering very high resolution sound, using DSD digital encoding. SACDs can deliver up to 5.1 channels of sound, but even if they do they are required by licence to also carry a two channel sound track. SACDs are most commonly made in a two layer hybrid format. One layer provides SACD music (stereo and, optionally, multichannel) while the other is fully compatible with CD players. The SACD specifications also provide for some video-carrying capability, but neither disc nor player offering this has yet been seen.