Which of the following is true regarding omni-directional microphones?

Omni-directional microphones are designed to capture sound from all directions equally. This characteristic makes them particularly effective for capturing environmental sounds, as they can collect audio from the surrounding atmosphere without bias towards any specific source. They are commonly used in situations such as recording ambient noise, live performances, or group discussions, where it’s essential to pick up sounds from multiple sources within the environment.

While the other options refer to uses or requirements of microphones, they do not accurately reflect the strengths of omni-directional microphones. For instance, these microphones are not ideal for isolating a single sound source, as their design captures audio from every direction, making them less effective for focused sound pickup. Additionally, they do not operate within a limited area; instead, they encompass a wide range. Lastly, while some microphones require a power source (like active condenser mics), many omni-directional microphones can function without one, making this option misleading as well.