Hearing Test as Easy as 1, 2, 3. Test How Old Your Ears Are. CYHT is Simple Ears Tester App. Are Your Ears in Fit Condition? When listening to a personal music system with earphones at a maximum volume, the sound generated can reach a level of over 100 dBA, loud enough to begin causing permanent damage after just 15 minutes per day! Noise-Induced Hearing Loss.