Very interested on NILI9920FcuHIFI if it works. Few questions here;

(1) How can I know if it works? Do you have some demo showing with and without the NILI9920FcuHIFI from AC? Or solely based on subjective feels?

(2) I do not have AVR, if I buy 2 unit of NILI9920FcuHIFI for my AV amplifier and sub separately, will it work good?

(3) What if my devices do not have earth? If remember well my sub only 2 pins... thus no earth... later I go to check my amp.