If a group of people are asked to decide if two tones are or are not the same loudness, it turns out that the majority of them will make different decisions depending on the frequency of the note and ...If a group of people are asked to decide if two tones are or are not the same loudness, it turns out that the majority of them will make different decisions depending on the frequency of the note and the initial loudness. For example most people can tell if the SIL level changes by 0.5 dB when the sound is at 80 dB but need a change of 1.5 dB to detect a difference if the sound is at 40 dB to start with.
