How to configure where only side speakers show?

[SubZero nX]

Can somebody help meh get the side speakers to show up ONLY! and when im using my headset for gaming and im using HDMI but it doesnt carry the sound over, and im using windows manage audio devices program to do it to

 

[SubZero nX]

Check the link below to configure HDMI in Windows
http/acer--uk.custhelp.com/app/answers/detail/a_id/3416/~/configuring-a-pc-to-send-audio-via-hdmi-in-windows-vista-and-windows-7

That got the HDMI to work but not the headset, i got it the headset to show up but i need to get it to only play sound through the left and right speakers and not the front because it does not support front speakers.