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For my speakers, same as yours, I used a toslink to toslink mini cable, when I had a MBP. toslink mini goes to the MBP and the bigger end, plain toslink goes into the back of the "controller". Thats a digital optical cable so its high quality.
 
For my speakers, same as yours, I used a toslink to toslink mini cable, when I had a MBP. toslink mini goes to the MBP and the bigger end, plain toslink goes into the back of the "controller". Thats a digital optical cable so its high quality.

thanks, do you think you could find a cable that would work well for me? i've looked on google but don't really know what my best option is. thanks for your help.
 
OK, for the Z5500 itis a "normal" Toslink connection (like on any audio equipment). What about on the back of the Mac Pro (early 2008)? Is that the same connection, or another version of the Toslink type?
 
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