These cheap fiber optic modules create a bunch of noise on their end , try’s UptoneAudio etherregen at both end with a fiber optic much cleaner blacker back ground fiber optic electrically don’t bring noise But if the signal is jittered full of noise to start it delivered a flawed signal to start ,I compared these head to head ,
land in my system fiber sounds a bit thinner , the key is a great hum Sonore is the best but $$ , 2 uptone Audio Ether regen are a good 2 nd choice .