In which scenario should an engineer consider adding voice lift to the system proposal?

The decision to add voice lift to a system proposal is primarily driven by the need to ensure that the speaker's voice is intelligible and clear to the audience, particularly in environments where ambient noise can interfere with communication. In scenarios where ambient noise levels are above acceptable levels, voice lift technology becomes essential. This technology amplifies the speaker's voice, allowing it to stand out against the background noise, thus enhancing clarity and preventing the speaker from being drowned out.

In contrast, while excessive quietness could be a reason to increase overall volume, it doesn’t specifically necessitate voice lift technology, which is more focused on balancing audible speech in a noisy environment. In situations where the audience is far from the speaker, while voice lift might help, the primary solution could be a more strategically placed audio system rather than solely implementing voice lift. Lastly, heavy echo typically requires acoustic treatment rather than voice lift, as the echo could distort the clarity of any amplified sound. Therefore, considering the need to ensure speech intelligibility in noisy environments, adding voice lift in response to high ambient noise levels is both a strategic and effective choice.