Help me in configuring my 4.1

#1
I have a 4.1 speaker(Logitech R20 2.1+2 Creative normal ones). The problem is that i am not getting the proper bass effect as my friends Logitech R20. He told that the settings may not be done properly. Mine is Realtek HD Audio. Pls help me in configuring it. Heres is the screenshot.

 


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