It seems that I'm the one confused here.
I am not considering 2 channel stereo as multi-channel. I am applying multi-channel capability to 5.1 and the quadraphonic.
It seems that some of the revered SACD's are of the 5.1 variety. This is what I would like to experience.
Then unless you can get some older gear you need a disc player that will output DSD or convert it to PCM, to send it over HDMI. You then need a multichannel receiver or pre/pro. In that latter case you will need the requisite number of amplifiers and speakers. If you want to hear SACD decoded from DSD then you need a receiver or pre/pro with a DSD decoder. I don't think there are players any more that have multi channel analog outs any more, but there may be. I can't name you one. Then of course you would need a receiver with analog multi channel audio ins. Unfortunately this is complicated and potentially expensive. It is small wonder people get confused, and this speaks to my point that DSD should NEVER have seen the light of day, and it is a terrible pity it did. There was never any need for it, as PCM that was well developed could, and would have, done it far better.
If you want a player that will send DSD over HDMI and plays back SACD perfectly then the Sony UDP-X800M2 is the player to get. It plays everything out there. It plays 4K BD as well as the $1000 Panasonic player which can't play SACD. I think it is better then the former Oppo players also.
I have the above Sony player and Panasonic DP-UB9000. I think that the video performance of both are identical. The Panasonic player can not best it in any distinguishable way. And that is playing both through the top of the line OLED 77" TV, considered the best screen available at this time.
I think that is as much as I can tell you about it all.
On one last point the audio only BD discs I have are every bit as good as SACD, and actually better, as you are not limited to 5.1 channels.