Playback microphone through DBS

I have a motherboard that has DBS port. Normally, i connect the DBS cable to my DVD player (i use it for audio only because of the watts of the player) to play movies from my computer and get the sound out of the surround speakers. However, is there anyway i can get microphone playback through DBS? The microphone playback through regular speakers that are connected through the computer's audio port, but when i tried with microphone, it didn't work. Any advice will be awsome. Thank you