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Sonic alphas generate sonic waves different from normal speech. This can vary from infrasonic to high-powered blasts of audible sonic energy.
The human body usually only makes audible sound with the vocal cords, and perceives audible sound (20 hZ to 20,000 hZ) using the mechanisms of the ear. A sonic alpha is able to generate sonic energy on a much more precise and powerful scale. This may involve a more advanced set of vocal cords, or an entirely separate set of organs that generate vibrations. Their ears are similarly adapted to cope with the generated energy.