Meanings of startling loudness in inglés

Somebody threw a bottle, which shattered with startling loudness somewhere behind the police; others followed.

A bluejay cried out, "jay, jay!" with startling loudness, and seemingly enjoyed his pent-up excitement.

The guitar twanged, and the two voices upraised, in harmony and with a startling loudness, the chorus of a song of old Béranger's:-

Thus, with startling loudness, he was accustomed to relieve his infrequent fits of depression; but decay, rather than change, was characteristic of the immediate prospect.