TPA3131D2: About the unused input pin in a single-ended application

Hi Team,

I have one question on the statement below.

"In a single-ended input application, the unused input should be ac grounded at the audio source instead of at the device input for best noise performance"

If ac grounding should be done at the audio source, then how should the unused input pins of the TPA3131D2 be handled? Could you please illustrate how the unused input should be ac grounded at the audio source?

Thanks!

Roy