History: Which of the following is not a cue to the location of a sound?

Which of the following is not a cue to the location of a sound?

• The phase of the sound.
  We use phase of sounds to determine location.
• Duration
  We do not use the direct duration of the sound to determine its location.
• Overall volume.
  We use volume of sounds to determine location.
• High-frequency content.
  We use the high-frequency content of sounds to determine location.