Some thing has broken in the unit! Switch speakers around to make sure its not a blown speaker! If its not the speaker then your right channel control will need replaced!
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Its sound like you have dirt, dust, some kind of containments in the volume controls of the unit are their separate vol controls for left and right id say if you could try some electronic spray contact spray and as you spray have maybe another person help you by working all the volume knobs full right full left or full up and or full down, If this help but doesn't solve you may need to remove and expose the circuit board inspect for loose or cold solder joints..Im not sure your make model year etc, But dollars to doughnuts most likely that would be my next plan off attacking the problem. Well im so sorry I hope this helps or at least leads you down the right path.
Replace center channel speaker with known good one. If no longer scratchy then the voice coil of removed unit is rubbing against the magnet pole and the speaker needs to be replaced. If the replacement speaker also sounds bad, then the amp for the center channel needs repair.
Congrats, you yourself is a good troubleshooter. Just pinpointed your problem. What you just diagnoist can be easilly checked just by taking other good known speaker. If that works your speaker is short check for audio output wires. If not your card needs replacement. If need further clarifications just comment.
Have you tried with headphones? Scratchy WITH heaphones. Reinstall driver. If it's NOT scratchy with headphones. Either your speakers are blown, (which usually doesn't happen), you need to reinstall your sound card drivers, or bad settings. Double click sound horn. Turn some volumes haflway, or mute sound channels you aren't using. Options Properties will let you show ALL sound properties. Ctrl+S makes the sound properties half size.
ReInstall Drivers: Start - Settings - Control Panel - System - Device Manager, Expand Sound Controllers, Right Click on your sound card, Click Uninstall. Reboot and reintall.
Might ask to reinstall automatically. Thats fine. Install then reboot. I prefer to cancel the install until I have rebooted. But both ways tend to work.
Hope you don't have to change your speakers. Need to pull your mobo to get to em. Instructions here pg. 5-55
James Mac
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