And i believe that TI has a series of app notes on designing compensation for high C loads as well
LTSpice example LoopGain2.asc is very convenient for checking opamp stability with capacitive loads. Using the same capacitor as Elvee did, resulted in critical margin of only 5°. However, using only 0.1Ω for R4 resistor, results with 63° margin.
My guess is that this is similar Vref RC filter for AK4499EX as in AK4499EQ evaluation board. Some AKM DAC datasheets suggest adding a RC filter for Vref in especially noisy conditions. Some here even claim that it improves sound.
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