Laptop subwoofer trouble in Windows 8.1

Hello,
   I have a HP DV7T-7000 Quad Edition and am suddenly having some trouble with my subwoofer. I believe it started after I upgraded from Windows 8 to Windows 8.1. My sub sounds terrible, kind of blown out. After some experimenting, it seems like windows is outputting the left channel through the sub. If I open up my speaker properties and adjust the balance on the levels tab, setting just the left side to 0 results in normal (though bassless audio), while setting just the right side to 0 results in audio coming from the sub and left speaker, and the sub sounds awful. Muting "mono mix" also seems to disable the sub so the audio sounds ok, but with 0 bass. 
I'm running the 6491 IDT driver. Thanks for any help you can offer!

Hi Draxus,
I understand that you are having an issue with the sound quality of the sub woofer.  The first step that I would try would be to download and install the following driver, 'IDT High-Definition (HD) Audio Driver'.
If this fails to resolve the issue, the next option that you do have is the following document, 'Troubleshoot the Subwoofer on Non-Beats Notebooks'. Skip the first step as you would have already installed the latest driver above. The following steps would make sure that the settings are correct.
Now if both these steps fail to resolve the issue, try uninstalling the driver through device manager. I have included the following the document, 'Uninstall or Reinstall a Device' from Microsoft.
Please let me know if this has resolved the issue with the sub woofer, thank you.
I worked on behalf of HP

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