Last night at work, I found the difference in amplitude of my boss' voice. Generally, my boss is a fairly quiet guy. He only yells when he has to talk over the noise of lawn mowers and other gas guzzling tools. When he speaks, it is very soft. Therefor, the amplitude of the sound waves is small. Also, he has a low voice, so his voice's frequency is much lower then the female workers in the office. When he yells, however, the amplitude of his voice is off the charts.