We know a shout was louder at the source, but the decibel level at our ears is proportional to 1/distance squared, meaning hushed voices aren't necessarily any quieter "in real life". I'd prefer suspenseful and dramatic scenes both play at similar, comfortable levels. I don't want to have to adjust the volume up and down so I can understand one scene and then not have it be disturbingly loud in the next. In practice, I just use subtitles to circumvent the "difficult to understand" problem.