Super Audio CD - worth it in 2018?

8-track quadraphonic to Blu-Ray Audio - surround sound in music

CD types & sonic quality (UHQCD, SHMCD, BSCD2, Crystal Disc, MQA-CD etc.)

Sony 5-Disc SACD Super Audio Compact Disc Changer Carousel - High End Sony CD Player

What's the difference between an SACD and DSD?

SONY ソニー CD NEW STEREO セレブリティー D-3000

Hi-Res Audio on the Cheap!

Did this obscure audio format REALLY sound better than MiniDisc?

Luxman D10x SACD Player In The Lab!!

Compact Disc: The Best Audio Medium in The World