Did you see Sony's words at link?
by R. Proffitt - 11/14/12 11:29 AM
In Reply to: How to connect Sony DAVDZ340 home theater system to a PS3 by Jonathandv
"Optical audio input - Listen to other sources such as a set top box or a games console in glorious surround sound"
The PS3 appears to have Optical output for such a connection as I read http://manuals.playstation.net/document/en/ps3/current/settings/audiooutput.html