optical input no sound

I just bought Edifier m3600D THX certificate speaker there are optical input, the problem is I try to optical output with my computer GA-Z77-D3H MAINBOARD but no sound, please help.
should I use av receiver to turn optical cable to speaker?
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More about optical input sound
  1. Did you set optical as default output in Windows > Control panel > Sound ?
  2. Yes optical as default output
    I see on device manager digital audio spdif is ready, work fine
    on control volume I can see sound indicator is moving
    Using Rca cables is work fine
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