The psychology department of Dayton University reports that loud talk can be ten times more distracting than the sound of a jackhammer. Loud, incessant chatter can make a listener nervous and irritable, and even start him on the road to insanity.
The loudest voice that comes to mind right now is Mary Murphy on So You Think You Can Dance. I don't know how poor Nigel stands it sitting right there beside her while she shrieks, whoops, and shrills. OK, that last word isn't a verb, but it applies.
There are a few former students who also had loud voices, but no one holds a candle to Mary Murphy. Who has a disturbingly loud voice to you?