Hello! Thank you, I received the item but over time I understand that one of the operating amplifiers is not working correctly. Sometimes in one of the channels there is a hissing and then smoothly exfoliates, resembles the effect of a sea wave. Sometimes loud, sometimes a little quieter, but it brings discomfort. In order to make sure that it was not a sound card, I changed the operating amplifier of the left channel to the right channel and the effect appeared in the other channel. Please help me solve this problem or send a new operating amplifier. Because this one looks like a broken one. Installed in ASUS STX II sound card. [Order #36361] (19/04/2020) Received 16.05.2020