Approximately the same distance as a good microphone can pick up the audio anyway. Read about near-field vs far-field: https://en.wikipedia.org/wiki/Near_and_f

Approximately the same distance as a good microphone can pick up the audio anyway. Read about near-field vs far-field: https://en.wikipedia.org/wiki/Near_and_far_field https://en.wikipedia.org/wiki/Near_and_far_field