A:Answer Bose QuietComfort® Earbuds utilize both active and passive noise reduction technologies. They use a sophisticated proprietary approach for active noise reduction, placing microphones both inside and outside the earbuds. The electronics system senses the sound in almost any environment and then measures, compares, and reacts — instantaneously — to produce an opposing cancelling signal. The passive noise reduction is achieved by a combination of the acoustic design and proprietary eartip design.
