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Cannot use all speakers after replacing HDD and reinstalling OS

I recently had to replace the HDD in my Alienware M14x.  The process went smoothly, the OS installed fine and I used to M14x resource DVD to install all the necessary drivers.  However, I cannot get sound to come from ALL the speakers in my Alienware.  Under sound options there are two speaker device selections (I assume one is for an internal sub and the other controls the two external speakers).  I can set either device to be the default but I cannot set both to playback at the same time, which is how it was before the HDD installation. So, I can either get all the high notes or all the low notes but not the whole range.

What can I do to get audio to come from both the external speakers AND the sub at the same time?  It won't allow me to set 2 defaults.  

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Re: Cannot use all speakers after replacing HDD and reinstalling OS

I believe I've fixed it myself.  I found some driver updates that were newer than the ones on my resource DVD.

1)I went here: support.dell.com/.../document

2)Clicked on my laptop (M14x)

3)Input my Express Service Tag

4)Downloaded new drivers