..., to be heard, be audible... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
... in quite audible tones:...
Harry Collingwood 「The Adventures of Dick Maitland」
...They areas yet a feeble folk, their voices scarcely audible above the clamor ofthe mob...
Booker T. Washington, et al. 「The Negro Problem」
... This time it wasdistinctly audible, the long, low moan of some one in sickness ordistress...
Charles W. Chesnutt 「The House Behind the Cedars」
...Now, as a heavy,drumming roar became audible, sheadded, in excitement: “Land sakes!There’s a train...
Various 「Ainslee's magazine, Volume 16, No. 3, October, 1905」
...Their only notes are a strangelisping sound often barely audible...
Chester A. Reed 「The Bird Book」
...Blyth's I may say that thecaracal differs very much from the European lynx, who, according toTschudi, betrays his presence by horrible howlings audible at a greatdistance...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...A harsh, rasping, cac-cac-cac; and a low,rich whistle, audible only at a short distance...
Frank M. Chapman 「Color Key to North American Birds」
...Underneath, a field-mouse was plowing itsway into the frozen earth, its tiny paw-scrapeswholly audible to the ears of the dog above it...
Albert Payson Terhune 「Lad: A Dog」
...It isreadily audible at the distance of a mile when it breaks the stillnessof a summer night...
Nathaniel Southgate Shaler 「Domesticated Animals」
...With an audible grunt, Wakayoo moved on...
James Oliver Curwood 「Baree, Son of Kazan」
...The sound of tearingplanking was distinctly audible above the roar ofthe waves...
John Charles Beecham 「The Argus Pheasant」
...Rub the end of the moistened finger on a strip of glass, or awindow-pane, and you will obtain a very audible sound, somewhatanalogous to that emitted by the chafer...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...When the noise of the train stopped, the soft roar of the Little Fallsgrew audible,—a voice at which all the weary animals pricked theirears, they knew not, most of them, why...
Charles G. D. Roberts 「The Watchers of the Trails」
...The heavy tread of Arlok’s return was already audible in the hall just outside...
Various 「Astounding Stories of Super-Science January 1931」
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