For richer sound, connect the two RCA audio cables to an extender and then connect them to a stereo receiver or other sound system. 

HDMI Cable Connection

The Wii U released in 2012 with HDMI output. 

Video Output - Supports 1080p, 1080i, 720p, 480p and 480i.

Wii component video hookup

You can connect to an HDTV with component video and get 480p video resolution.

Wii HDTV component video hookup diagram. Use a Wii component video cable. 

How to Set a Wii to 480p and Widescreen Modes

HDTV sets benefit from widescreen mode and progressive scan.

From the Wii channel menu, select Wii Options (the round button on the bottom-left of the screen with "Wii" on it).

Brings up the Wii settings option

Select the wrench icon (Wii settings) on the right side of the screen

Select SCREEN

Select TV Resolution

Select HDTV 480p and Confirm

Go back to the screen menu page and select widescreen settings

Select Widescreen settings

Select widescreen 16:9 and then confirm

Now go back and play your Wii game.

You may also need to set the correct screen format.
Open Settings > Wii Settings > Screen
Set the TV Resolution setting to EDTV or HDTV (480p)
Next, set Widescreen Settings to Widescreen 16:9
Click Confirm to finish

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