Kr4...What makes you think that the Master recording was stereo? The Master is usually a dozen or more channels, so even the 5 channel version is a mixDOWN.
There are a good many SACD available which are not multichannel. In a multichannel SACD the stereo recording is on a completely different area of the disc, so what you get, if you play that area,is a stereo program as the recording engineer chose to mix down from his master.
There are a good many SACD available which are not multichannel. In a multichannel SACD the stereo recording is on a completely different area of the disc, so what you get, if you play that area,is a stereo program as the recording engineer chose to mix down from his master.