HELP! get sound from ps3 using optical

[stow123]

yeah thanks for your help ive just found similar things when i looked.So i use a coaxial cable from my reciever to the box then optical from ps3 into the box? would i lose any sound quality? So if i selected optical on the ps3 it would still work do you think? Is this why you think its not working then because im going from OUT to OUT i thought optical was just a connection didnt think it had out and in.I dont understand those adapters do i put that on the end of my optical calbe and plug it into the coaxial it dosent look the right fit the coaxial looks more like a phono connector