Instructions
Power your Nintendo Wii on and wait for the main menu to appear.
Press the "Home" button (house icon) on the Wii Remote. Use the directional pad to select "Wii Remote Settings." Press the "A" button to enter the menu.
Select "Volume" with the directional pad. Here you&'ll see a "+" and "--" symbol. Between the symbols, you&'ll see the volume level bar.
Select "--" with the directional pad. Press "A" to reduce the system volume. Each time you do so, you&'ll see the volume level bar reduce. Select a volume you are comfortable with, and then select "Close" to exit the menu.