English

be perceived by one's auditory sense _(takkur)
― we heard his cry

Japanese

聴覚によって捉えられる _(takkur)
― 彼の叫び声が聞こえた

_{takkur (2018-01-31 11:25:25)}

unintentional verb;

_{takkur (2018-01-31 11:25:25)}

the subject of "聞こえる/きこえる" is the thing to be seen. the agent of it is optional.