Sony WH-1000XM4 Help Guide - Page 83

Help Guide Wireless Noise Canceling Stereo Headset WH-1000XM4 Optimizing the noise canceling function to suit the wearer (NC Optimizer) This function optimizes the noise canceling function by detecting the shape of your face, your hairstyle, how you wear the headset due to the presence or absence of glasses, or the pressure change in an airplane. It is recommended that you run the NC Optimizer function when using the headset for the first time, when the wearing condition has been changed or when the air pressure changes between being on an airplane and on the ground, etc. 1 Put on the headset with the power turned on. 2 Press and hold the CUSTOM button for about 2 seconds until you hear the voice guidance say, "Optimizer start". Test signals will be heard during the optimization. When the optimizing process is finished, you will hear the voice guidance say, "Optimizer finished". About the instruction manual video Watch the video to find out how to use the NC Optimizer function. https://rd1.sony.net/help/mdr/mov0014/h_zz/ Hint It is recommended that you run the NC Optimizer again after changing your hairstyle, removing eyeglasses worn on a daily basis, or implementing other changes to the wearing conditions. 83