Dunno what to tell ya. guy. I just know what I know.
And, SACD CD's don't downconvert. They generally are dual layer discs, one SACD layer and the other redbook CD. If you play a SACD only disc in a non SACD capable unit, it won't work.
AFAICT, to get "true" SACD quality, one needs a SACD player with a built-in DAC that can handle SACD's. These output via analog six audio outputs, generally in a 5.1 format. ...like the Oppos.