Review by Hif.com.pl (Polish), May 2021
https://hi-fi.com.pl/testy/kolumny/5277-marten-oscar-duo.html?
English translation by Kronos AV
https://www.kronosav.com/blogs/news/marten-oscar-duo-review-a-class-of-their-own?
Marten Oscar Duo: A Class of Their Own