Which applications would typically utilize both rheostats and potentiometers?

Audio equipment is a prime application that commonly utilizes both rheostats and potentiometers due to the nature of sound control and manipulation. In audio systems, potentiometers are often used as volume controls, allowing precise adjustments to the audio signal's amplitude. This is critical for achieving the desired sound level in various playback scenarios.

Rheostats, which are essentially adjustable resistors, can also be implemented in audio equipment to manage current flow in certain components, such as speaker drivers. By adjusting the resistance in a circuit, rheostats can help fine-tune the performance characteristics of the audio system, such as altering the loudness or tonal qualities.

The combination of both components allows for detailed control over sound output, enhancing the listener's experience. In contrast, applications related to digital signal processing, power management, and thermal insulation do not typically require the fine-tuning and variable resistance control that audio equipment demands. Therefore, the connection between audio equipment and both rheostats and potentiometers is clear, making it the appropriate choice.