When it comes to describing someone or something with a powerful, booming voice, the phrase "more big-voiced" may not always convey the appropriate tone. There are several synonyms that can be used to highlight a voice that commands attention and exudes authority. Some of these terms include "thunderous," "resounding," "sonorous," "booming," "stentorian," and "commanding." Each of these words adds a layer of intensity to the description, making it clear that the speaker's voice is not something to be ignored. So, instead of using the phrase "more big-voiced," consider using one of these powerful synonyms to create a more impactful description.