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TPA6404-Q1: Have TPA6404 pass ISO16750-2 4.4

Part Number: TPA6404-Q1

Hi Team,

My customer's CAR OEM need to pass the  ISO16750-2 4.4

http://www.compel.ru/wordpress/wp-content/uploads/2017/05/ISO-16750-22010E-.pdf

Power supply superimposed ripple

ISO16750-2 4.4 

The test conditions are as follows:

Input resistance: <100 mΩ

Test time: 10 min

Frequency range: 50Hz-25kHz

Duration: 2min

Peak-to-peak value: 4 V

Working mode: USB play video                                             

When customer use our TPA6404-Q1 to test this, they also add 100uH and 2200uF in 12Vsupply.

But when they superimposed noise ripple to power supply from 50Hz-25kHz, they could heard that the speaker have output noise.

Their requirement is even having superimposed noise, the ear can't hear the noise from speaker.

Could you please give some advice about passing ISO 16750-2 4.4?

Thanks!