Other clairaudients may receive information by actually hearing a person speak, as if they were in the room next to them.
Many people have a degree of clairaudience but do not recognize it like so many intuitive/spiritual abilities, it has always been there. Some people have clairaudient experiences in the form of voices of someone they have known, or a voice they don't recognize, others don't recognize their psychic ability initially as the messages just sound like them thinking to themselves.
Opening the clairaudience faculty has to do with DNA activation of encoded cellular memories, activations of the chakras, raising the frequency of awareness, balancing the energy bodies, and the ability to trust in what is being 'heard' and 'seen'