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  1. Microphone Audio Jack: 3.5mm analog audio jack for microphone input to the computer.
  2. Front Speakers: 3.5mm analog audio jack for output to speakers (front, if using surround sound) or headphones.
  3. Side Speakers: 3.5mm analog audio jack for output to side speakers (if using surround sound).
  4. Center / Subwoofer Audio Jack: 3.5mm analog audio jack for output to center speaker and subwoofer (if using surround sound).
  5. Optical S/PDIF Out: Digital audio output port compatible with optical S/PDIF cables / devices (also called TOSLINK).