Dv6750 was watching some movie in full sound, suddenly speak voice is different

I was watching some movie in media player with full volume, suddenly it's sound start making different voice, the voice is diffent and it's very noisy, but with the headphone it's working fine, I checked the driver in device manager there's no error, tried to restart the laptop but problem is remain same.
Please advice.
Thanks in Advance

Quit Safari.
  Hold the shift key down and relaunch Safari.
Reset Safari.
Launch Safari
Click Safari in the menu bar.
From the drop down select "Reset Safari".
Uncheck the box next to  " Remove saved names and passwords".
Click "Reset".
Empty Caches
Safari > Preference > Advanced
Checkmark the box for "Show Develop menu in menu bar".
Develop menu will appear in the Safari menu bar.
Click Develop and select "Empty Caches" from the dropdown.
Turn off Extensions if any, and launch Safari.
Safari > Preferences > Extensions

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