Wii has Pro Logic Logo so...

[Rubycon]

If this were connected to a Pro Logic Receiver with appropriate speakers would one hear sounds behind them?

 

[DivideBYZero]

Yes, with games that support it.

 

[Fox5]

As long as you set your receiver to output pro logic. That even works to some extent with any stereo source, but will work best in content that has been optimized for it.

 

[biggestmuff]

The Wii supports DPL II.