It is not necessarily the vocal shape that directs all the sound, and obviously, the posture initially affects the direction of the sound. If posture is not straight, it is possible that the sound starts going toward the ears, from starting at the vocal tract and then resonating within the skull.
The straight alignment can better assure that the sounds emit through the mouth.
Result is lesser volume of sound to ears and reduced tinnitus and hyperacusis.
This returns to the concept of Maya and also Alexander Technique. Hearing is never right or accurately established, until the vocal apparatus is sitting in a regular vocal sound pathway–which in our case, is a detensed throat and inner mouth pathway. This begins the cause of Maya in hearing.
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