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TPA6211A1: large pop at startup and power off

Part Number: TPA6211A1

Hi team,

My customer tested on TPA6211A1 EVM, they only have single ended signal so connected IN- to ground and use IN+ as input. SHUTDOWN is default connection as in EVM. they hear large pop at both power on and off, why is this happening? How to eliminate the pop?

Thanks.

George