Muoi, make slumberings of so great audibleness I find not rest.    From Wordnik.com.  [Seven Maids of Far Cathay] Reference

Her voice was habitually subdued to the limit of audibleness; she spoke with precision, and in language very free from vulgarisms either of thought or phrase.    From Wordnik.com.  [Thyrza] Reference

Of all this Daisy delivered herself with the sweetest, brightest audibleness, looking now at her hostess and now round the room, while she gave a series of little pats, round her shoulders, to the edges of her dress.    From Wordnik.com.  [Daisy Miller] Reference