The microphone system on the Bose QuietComfort headphones is built into the earcups themselves. It uses multiple microphones placed inside and outside the earcups for active noise reduction and to improve the quality of phone calls.

- The external microphones capture surrounding sounds for active noise reduction and Aware mode.
- Internal microphones help detect and cancel unwanted noise inside the earphones.

These microphones are an integral part of the headset design and require no additional installation or configuration.