Final answer:
The primary disadvantage of hearing characters' voices is that it prevents readers from creating their own interpretations of the voices, potentially affecting their personal connection to and interpretation of the characters.
Step-by-step explanation:
One possible disadvantage of hearing the characters' voices as opposed to silently reading the scene is that readers are unable to create their own voices for how the county attorney and Mrs. Hale might sound. When reading silently, individuals can imagine the tone, inflection, and emotion behind each character's lines, thus personalizing the experience and potentially deepening their connection and interpretation of the characters. However, when the dialogue is heard rather than read, these personal interpretations are replaced with the provided audio, which may not align with the reader's imagination or interpretation of the text.