To those who are affected by the incessant hum, have you ever tried to actually measure it by some technical equipment? I am pretty sure there are devices that

To those who are affected by the incessant hum, have you ever tried to actually measure it by some technical equipment? I am pretty sure there are devices that can detect and register sounds of almost all frequency levels. What about the noise canceling headphones? Sony, Bose and Sennheiser have some top-notch headphones that cancel out static noise. Being very sensitive to noise, I use one of those and am totally satisfied.