What is one key feature of a dynamic microphone?

A dynamic microphone is recognized for its ability to operate without needing any external power source to generate an audio signal. This makes it particularly advantageous for various applications, such as live performances and recording situations where ease of use and reliability are essential. The construction of a dynamic microphone involves a diaphragm attached to a coil of wire within a magnetic field, allowing it to convert sound waves directly into electrical signals mechanically.

This characteristic stands in contrast to other types of microphones, such as condenser microphones, which require phantom power to function because they rely on an electrical charge to capture sound. Additionally, the claim about frequency response does not apply here, as dynamic microphones can often have a wider frequency range suitable for many sound sources. The heart-shaped capture pattern is related to polar patterns typically associated with cardioid microphones and doesn't exclusively define dynamic microphones.

Thus, the characteristic of not requiring power underscores the practicality and versatility of dynamic microphones in various sound environments.