Jon, as previous replies have indicated, SACDs can deliver better sound, especially of course if the SACD is multi-channel rather than stereo only(the first SACDs and many now are still just stereo). There are also now some "hybrid" SACDs which have a separate CD layer and therefore will play on a regular CD player. Other than the multi-channel aspect(when present)SACDs and DVD-As use higher sampling and/or bit rates to provide for a higher frequency range and dynamic range than CDs have. However since the CD frequency range is ample for human beings and its dynamic range is plenty for recordings which are possible, these advantages are of only theoretical benefit. Besides the multi-channel aspect, the quality depends on the original recording technique and the mixing/mastering then applied, not on whether it winds up on a CD, DVD-A or SACD.
