Legacy V System Owner's Operating Manual page 26

Below about 1500Hz there is a phase difference between the sound waves entering the ears, thus
providing acoustic localization cues (interaural time differences, or ITD). At frequencies greater than
1500 Hz, the wavelength is shorter than the distance between the 2 ears, and phase sensitivity
diminishes. The brain now relies on acoustic head shadows produced across the face to provide level
differences to each ear (ILD) and cues for the localization
of this sound. If the speaker system projects sound onto
the room boundaries creating a diffuse field before it can
reach the listener directly, these fragile ITD and ILD cues
will be altered and scrambled.
The key to imaging is preserving the interaural time and
level differences. The shadowing to the far ear from the
source is quite fragile in a reflective environment.
Maintaining directivity in the speaker radiation pattern is
essential to preserve this content. Legacy V, Whisper,
and Aeris each offer unique directivity control to provide
greater clarity, better localization and resonance
reduction.
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