How much noise reduction does the Bose A30 Aviation Headset provide? What is the attenuation at different frequencies?

The Bose A30 Aviation Headset provides three modes of user-selectable noise cancellation that were individually engineered for specific use cases. “Low” helps optimise interpersonal communication outside the use of an intercom system. “Medium” provides the most consistent amount of reduction across a wide range of frequencies, and “High” provides the most active noise reduction to maximise the signal-to-noise ratio for radio communication. All three modes have been engineered for distinct uses.

Bose does not make claims about the mode of noise reduction. We encourage pilots to try the product in a variety of aircraft to experience the dramatic performance and capability of each mode for themselves.