Yes it where the catch phrase "seven thunders" comes from the end of voice of the waters as the unrevealed glory of God. . The seven thunders would coincide with seals. Seven, the perfect/complete law of God Judgment.
Its the end of new prophecy nothing else needs to be added. The thunder is the warning not to add or subtract from the perfect.
Psalm 29 Give unto the Lord, O ye mighty, give unto the Lord glory and strength. Give unto the Lord the glory due unto his name; worship the Lord in the beauty of holiness. The
voice of the Lord is upon the waters: the God of glory
thundereth: the Lord is upon many waters.