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TPA2012D2: When power on , there is a "pop" noise sounded.

Part Number: TPA2012D2

Hi  all , 

customer found that when each time when power on , they always hera a sound of "pop" . Here is the related sch. Is the OUTPUT status are undifined when power on? Is there any way to eliminate it ?

Could you help to offer some suggestion to test or improve it? Thanks .