One thing to note is that it's hard (impossible?) to get a multi channel output via TOSLINK. Most playera will only output. 2 channel audio via TOSLINK, if they even do that, which may depend on the source. OTOH many new systems can do multi channel via HDMI. it's possible that HDMI might be the way to go rather thatn SPDIF/TOSLINK
Actually to clarify the multi channel capabilities of SPDIF see here - http://ac3filter.net/wiki/How_to_pla...3/DTS)_AudioCD
This shows that multi channel PCM audio should not be possible with SPDIF, but compressed audio using DTS/AC3 can be.