How does the sound card detect what sound system its being plugged in

Hi, I am about to hook up a 4.1 sound with a 2.1 sound on to my sound card, making it a 5.1 ( with the 2.1 as center).
How would the sound card detect each system being a 2.1 or 4.1? How does it know which system is plugged in to which port?
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More about sound card detect sound system plugged
  1. The sound card cannot detect that. It just offers the playback depending on the speaker profile you select in the windows sound device properties.
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