Are there ways besides the Thaumaturgy spell to make a person louder?

I’m a relatively new DM playing with a couple of people from my school, and I was trying to find a way to explain a general being able to announce something at superhuman volume (while still talking in Common, not some kind of code of horn blasts).

The only magical way to do this I’ve found so far is the thaumaturgy spell. Are there any magic items or spells that I am missing?