成唯識論述記 5.818

5.818

述曰：顯聞聲位由在定中，非當取聲即便出定。領受聲已，定中意識希望是何方始出故，聞聲後時方始出定。

The Commentary states: This shows that the state of hearing the sound occurs while in concentration; one does not emerge from concentration immediately upon grasping the sound. Having apprehended the sound, the mental consciousness within concentration desires to know what it is, and only then begins to emerge; thus only after hearing the sound does one begin to emerge from concentration.