HI sir
https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1192735/tas2781evm-tas2781-frequency-reponse-of-pwr_mode3?tisearch=e2e-sitesearch
Sorry for replying late.
After I tried the procedure which Ivan provided. The result is as picture below, the red curve is the measurement with connecting “AUX-0025” filter.
But this result is not close to the TI spec, it dropped over -1dB before 40KHz.
If we measured without “AUX-0025” filter, the result became blue curve which is closer to the spec, but with worse THD+N.(following picture)
May I ask that what the method did you measure?
Is there anything I need to be aware of?