In the process of dubbing, the voice of the dubbing actor is different from the normal speech in daily life, and the emotional expression is stronger, so the voice needs to be artistic and role-oriented.
Theoretically speaking, if the physiological basis of a person's vocal organs remains unchanged, his absolute timbre will not change. It is something that everyone can change the amplitude and frequency of sound by adjusting the oral airflow intensity of vocal cords and muscles of various parts of the vocal system, and then change the sound. If we are sophistry, everyone has countless kinds of sound lines, and any slight change in the vocal system can be regarded as a change in sound.
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But what I said above has no practical significance in dubbing. In dubbing work, as well as the voice line that people often say, it is essentially a depiction of sound. Voice actors can achieve more skilled, controllable and greater voice change than normal people through the exercise of vocal organs. This is the so-called voice tension, which is the foundation. Re-creation according to the role, so that the sound becomes the voice of the role, which is the sound line. In other words, voice change is only the foundation, and further is the ability to create and perform, and finally the result of voice characterization can be achieved.
If you can voice, you can basically be a voice actor. The answer is that ordinary people who don't have the ability of a voice actor can't change their voice like a voice actor.
Therefore, the appearance of the voice actors we see in the performance is just the tip of the iceberg, and what supports this appearance is all they have.
As the old saying goes, one minute on stage, ten years off stage.