Had for some time the problem is that the RCA output of my WD TV Live Hub is booming at the Hifi - no was not a ground loop, located at WD. I also have a WD TV Live, which has the same problem. With this converter now I could instead use the optical output and it works perfectly. The converter itself is solid and of decent quality, there are all necessary cables - not of course at the price - and it is working properly. Has solved my problem, I can fully recommend.