The difference in sound volume between dialogue and action sequences in movies is primarily due to the concept of dynamic range and the intention to enhance the overall cinematic experience.
Dynamic range refers to the difference between the quietest and loudest sounds in a piece of audio or a film soundtrack. In movies, it is often desirable to have a wide dynamic range to create a sense of realism and immersion. This means that quieter moments, such as dialogue scenes, are intentionally mixed at a lower volume to emphasize the subtleties of the spoken words and the nuances of the performances.
On the other hand, action sequences, which typically involve explosions, gunfire, or other intense sound effects, are meant to be exciting and impactful. To heighten the sense of intensity and engage the audience, these sequences are mixed at a higher volume. The increased volume allows the sound effects to be more prominent, creating a greater impact and adding to the overall excitement and energy of the scene.
The contrasting sound levels help create a dynamic audio experience in movies. By adjusting the volume according to the content, filmmakers can guide the audience's attention, evoke emotions, and enhance the storytelling. These variations in sound volume are carefully considered during the sound mixing and mastering process to ensure a balanced and engaging audio experience throughout the film.