http://www.samsung.com/us/video/tvs/UN55H6350AFXZA

"Enabling/Disabling Sound Feedback
MENU > System > General > Sound Feedback Try Now
Sound Feedback provides audio cues as you navigate through menus and select menu options. Sound
Feedback is on by default. You can set it to Low, Medium, High, or Off." - From product manual.

Try that.