Power quadruples when amplitude doubles, since power scales with amplitude squared

Evidence

The crucial point is that the energy and power in the wave is proportional to the square of the amplitude. This means that the power reaching the audience is not twice, but four times what it would have been without the wall! — Eric J. Heller, Why You Hear What You Hear- An…, 510

Categorization

• DEFINE: Explains the amplitude-squared relationship driving sound intensity perception, central to the why-we-hear-what-we-hear question.