1. Adjust the microphone volume or gain settings on both the speaker and the audio source to increase the input volume.
2. Ensure the microphone is positioned correctly and close enough to the sound source (e.g., the person speaking).
3. Check if there are any obstructions or obstacles blocking the microphone.
4. Consider the quality of the microphone itself. If it's a separate microphone, test with a different microphone to see if the issue persists.
Further Reading
Microphone Choice and Placement Secrets for Recording
https://www.shure.com/en-US/performance-production/louder/microphone-choice-and-placement-secrets-for-recording