I am suggesting following steps which you can use to fix the matter of yours.
Well you need to move for the following location on the computer.
Code:
C:\Users\your user name\Documents\My Games\DiRT3\hardwaresettings
Now you have to search for the hardware_settings_config.xml file. You need to open the file into notepad and simply go for the Audio.
Code:
<audio_card>
<audio mixing="Rupture3D" />
</audio_card>
You need to change to the Rupture3D to Hardware. I am hoping that it would be useful to meet the requirement of yours.
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