Speaker settings in Windows Media Player
Use the Speaker Properties dialog box in Windows Media Player to select the audio device you want to use and change speaker settings.
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Click the
Start button

, click
All Programs, and then click
Windows Media Player.
If the Player is currently open and you’re in Now Playing mode, click the
Switch to Library button

in the upper-right corner of the Player.
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In the Player Library, click Organize, and then click Options.
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Click the Devices tab, click Speakers, and then click Properties.
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Select the options you want, and then click OK.