As you notice MANY items on Discogs are written "QUADRAPHONIC" but some photos are missing to be FOR SURE that they are really "QUADRAPHONIC", and some are NOT "QUADRAPHONIC":
https://www.discogs.com/Antonín-Dvo...řák-Symphony-No-9-in-E-Minor/release/17968618
ANY OTHERS ?
https://www.discogs.com/Antonín-Dvo...řák-Symphony-No-9-in-E-Minor/release/17968618
ANY OTHERS ?