Thanks for the clarity.
Myths and realities about Chinese amplifiers from Opera Audio .
In December 2019, I became the owner of two beautiful monoblock Cyber 845S and an equally beautiful preamp Opera Consonance Linear1 .
http://www.opera-consonance.com/products/eproducts_TS.htm
http://www.opera-consonance.com/products/amplifier/Cyber845S.htm