Also known as Haas effect. Refers to how we locate sounds based upon time arrival differences between our two ears. Not only does it effect our perception of where the sound is coming from, but it also effects our perception of the volume. The same sound can be presented to each ear at the same volume, but we will hear the one arriving first as louder. This effect can be so drastic that you can be fooled into thinking one of your monitor speakers isn’t outputting any sound simply because you are sitting a few milliseconds closer to the other one.