Resonance is how our vocal energy (breath) filters through our vocal tract (from the larynx or “voice box” to the nose).
A person who was assigned male at birth will typically have a larger larynx and thicker vocal folds, therefore a larger vocal tract means the sound will be deeper, and will typically resonate in the chest.
A person who was assigned female at birth, and who has not gone through a testosterone surge during puberty, will have a smaller vocal tract. The vocal energy will be directed more forward, towards the face.
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