During the operation of engines that emit loud noises such as lawnmowers and pressure washers, I've had similar experiences. With the lawnmower, the deafening roar reached both ears the moment the blade struck a stone. Using the pressure washer, it was highly unpleasant to hear the loud abnormal noise, possibly caused by splashes or wet components touching the microphone. I believe the abnormal noise from the lawnmower could be resolved with a software update.