The problem is, the minute you route sound through the TVs optical out, it usually (in most models) will shut off the TV speakers.
I would just buy a half decent soundbar if you want a no fuss no muss deal. I mean, Sony makes some great ones for less than $200.
EDIT: That said, if the audio stays on when hooked into the RCA stereo outs, you can just buy something like this:
http://www.futureshop.ca/en-CA/produ.../10053785.aspx
They generally go for ~$60 around boxing day.
nm
