One of the other members over at the amp/preamp forum found far more info in a second part for you vinyl guys, you have to hit the translate.
https://av.watch.impress.co.jp/docs/topic/special/1298192.html
https://av.watch.impress.co.jp/docs/topic/special/1300097.html
Cheers George
https://av.watch.impress.co.jp/docs/topic/special/1298192.html
https://av.watch.impress.co.jp/docs/topic/special/1300097.html
Cheers George