What is a disadvantage of using mechanical modulators?

The choice regarding the limitation of mechanical modulators states that only a capacitor or variable inductance microphone may be used. This is correct because mechanical modulators often rely on specific types of components for signal modulation. In many cases, these modulators are designed with particular microphones in mind, which can limit their use and flexibility in different applications.

Mechanical modulators operate based on physical movement or modification of components to encode sound information. Therefore, the type of microphone that can be integrated into these systems is restricted to those that can effectively work within the mechanical framework, such as capacitive or inductive types. This limitation can pose challenges when trying to achieve higher fidelity or integrate modern audio technologies that rely on a wider range of microphone types.

Other answer choices do not accurately capture this specific limitation found in mechanical modulators.