Did you see Sony's words at link?

http://www.sony.ee/product/hcs-surround-kit---dvd-player/dav-dz340

"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

Bob