Answer:
"Echo" is not one of the four main vocal dynamics utilized by actors.
Step-by-step explanation:
The four main vocal dynamics utilized by actors are:
Volume - the loudness or softness of the voice
Pitch - the highness or lowness of the voice
Tone - the quality or character of the voice
Tempo - the speed or pace of the voice
"Echo" is not typically considered a vocal dynamic, as it refers to the reflection of sound waves rather than the qualities of the voice itself. However, actors may use techniques such as echo or reverberation for artistic effect in certain performances or settings.