im from Lima, Peru. I use the Bose A20 aviation headset every flight I have, but recently when I turned on the ANR a very loud static noise started to appear in both cups, and the battery consumption is too high. Hope somebody can help me.
Have had similar problems not with the A20 but with some of my older X models. You don't say if it is a 'powered A20' off the Aircraft or a 2 plug 'non-powered' unit. However, it is most likely not going to affect the issue. I will stand corrected by the Bose Engineers but I would most likely suggest it is a Voltage Regulator fault in the Headset Voltage Control or an ANL Fault causing a high current drain and subsequent static noise. I feel sure the Bose Guys will suggest you return it to your nearest Bose Agent so they can take a look at it for repair processing.
If you haven't tried it already, maybe check with another Headset if you can that it's not the Aircraft output or a power supply fault, but I assume you have done that already.