The first to approach the ear of the head was Don Antonio himself, and in a low voice but not so low as not to be audible to all, he said to it, "Head, tell me by the virtue that lies in thee what am I at this moment thinking of?"
There are no more uses of "audible" in the book.
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She spoke in a barely audible whisper.
It was so quiet, our breathing was the only thing audible in the room.