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How could I measure the delay of an external analog loopback on ADZS-SC584-EZLITE board?

Hi ADI experts,

Now I'm developing ANC solution based on the ADC DAC playback SC589 example codes on ADZS-SC584-EZLITE board.

And I have two questions.

1) How could I measure the delay of an external analog loopback (from RCA audio output to RCA audio input) on ADZS-SC584-EZLITE board?

-> Could I estimate the delay using correlation? 

2) How could I minimize the delay of an external analog loopback (from RCA audio output to RCA audio input) on ADZS-SC584-EZLITE board? 

-> Do I need to modify AUDIO_BUFFER_SIZE to a smaller size in the adc_dac_playback.h file of the ADC DAC playback example?

Thanks for your support!