Had an audiogram done in my medical last week and I am convinced that the AME used noise cancelling headsets 'cos I couldn't hear a thing!
He did quirkily state that the requirement for the most effective ANR headsets diminishes proportionately with age and thus inversely with the ability to fund them.
Lightspeed ANR 30g are a delight and allow all those little extraneous noises like..... Terrain - Terrain...... Glideslope - Glideslope........ Pull up - Pull up .......to filter through without creating a major distraction.