About Bose A20
When Bose released its first active noise cancellation headset in 1989, the company originally designed it for use by the U.S. Air Force, not civilian pilots. The long-anticipated successor to the Bose X aviation headset, the Bose A20 made its debut at AirVenture 2014. These headsets use active noise cancellation, or ANC, by sampling the ambient noise with tiny microphones in the earpieces. The ANC electronics generate a wave that is 180 degrees out of phase with the ambient noise. This cancels fatiguing, low-frequency noise without keeping you from hearing engine changes. The A20 improved on the Bose X's performance in several areas. When the user powers up the Bose X, activating the noise cancellation, the headset lets the quiet in flawlessly. When powered down, the unit's passive noise canceling capabilities fell short. The earcups did not seal completely, letting ambient noise in. The Bose A20 features improved foam lining, earcup materials, and larger ear cups for a better ear seal. It also sports an additional mic in each earcup and tougher electronic components. An optional Bluetooth feature allows you to connect your cell phone, and a mini jack connects with audio devices, GPS, or portable traffic system. Two AA batteries keep the A20 going for about 45 hours. For a comfortable, capable ANC headset, browse the vast inventory on eBay for Bose A20 headsets, carry cases, and replacement accessories.