Hi, I thought this would be a good time to ask the community about this problem I have had for the longest time. Ever since I setup my Logitech z-5500 and used it with headphones, the headphones begin to make a hissing noise when they are not being "used". When the system is not receiving audio, it starts to hiss after a few seconds and it gets very annoying. I use a mini-toslink to toslink cable if that matters. I wanted to know how to resolve this problem.