Revelation 5:2

5:2 And I saw a powerful angel proclaiming in a loud voice: “Who is worthy to open the scroll and to break its seals?”

Revelation 7:10

7:10 They were shouting out in a loud voice,

“Salvation belongs to our God,

to the one seated on the throne, and to the Lamb!”

Revelation 10:3

10:3 Then he shouted in a loud voice like a lion roaring, and when he shouted, the seven thunders sounded their voices.

Revelation 16:17

16:17 Finally the seventh angel poured out his bowl into the air and a loud voice came out of the temple from the throne, saying: “It is done!”