The Lord on high (comp. Psalms 92:8) is mightier than the noise of many waters; literally, than the voices of many waters (comp. Psalms 93:3). As the waters represent angry nations, the poet speaks not only of their "noise," but of their "voices."
Yea, than the mighty waves of the sea; or, "the glorious breakers of ocean" (so Kay; and comp. Exodus 15:10).