Rozi 3.5 mm audio jack osim što se koristi za mikrofon koristi se i za Central /Subwoofer Speaker Out
stranica 9
http://asrock.pc.cdn.bitgravity.com/...350%20Pro4.pdf
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To configure 7.1 CH HD Audio, it is required to use an HD front panel audio module and enable the multichannel audio feature through the audio driver.
Please set Speaker Configuration to “7.1 Speaker”in the Realtek HD Audio Manager.