Computer help: Center Speaker Stealing Audio from the Subwoofer | 5.1 Logit

Center Speaker Stealing Audio from the Subwoofer | 5.1 Logit

One night ago this problem was did not exist. As far as I can tell, I reset my computer and when WinXP came back on, the problem emerged.

When a deep bass note would be played, normally by the subwoofer alone, it is also played through the center speaker of my Logitech X-540 5.1 system. I wouldn't mind the center speaker playing bass if it knew how to play it. Instead what I hear is a crumbly sound. Simple solution? Unplug the center speaker. Well unfortunately the bass seems divided, whether or not the center speaker is plugged in or not. Songs with a usual bassiness are not so bassy.

My sound card is Sound Blaster X-Fi Platinum. Sound through my headphones when plugged into my PC's front headphone slot is fine. I have double checked all my speaker connections, making sure the right speakers are in the right plugs, and that the output and input is correct.

I'm sure that I have the latest drivers and software updates.

I've checked things like EAX, CMSS-3D, EQ, Crystalizer, etc. On or off doesn't seem to affect the problem. The only thing that I can possibly suspect is the SPDIF I/O function.

Audio is not connected with SPDIF, yet the SPDIF Input Settings is on Default, and that choice list is grey so I cant change it. Although I feel that before I might have been able to adjust it. Although I don't imagine this contributes to the problem?

It is a little frustrating, I'm not sure if the problem is with WinXP, the speakers, or the audio settings. If anybody has any thought or something that I could try please let me know.

Creative Diagnostics comes out clear. When testing speaker polarity the center speaker receives all of the appropriate noise, only the subwoofer is shared by the center speaker.

As far as I know I have not installed anything new. I've just come off of a fresh XP install about a week ago. I believe this issue to be related to something in the PC though, not the speakers. However I could be wrong.

Any other info I can provide, please feel free to ask.

Thanks in Advance,
Griffin Fisher