可聴 is read as かちょう (kachou) and means audible.
かちょう
kachou
かちょうど
audibility
かちょういき
audible range
かちょうしゅうはすう
AF
かちょうしゅうは
audio frequency
かちょうきょり
audible distance
かわいそう
poor
かきゅうてき
as ... as possible
かし
visibility
かようりつ
availability ratio
かそせい
plasticity
かゆうごうきん
fusible alloy
かてんめん
developable surface