The frequency range refers to the bandwidth within which a microphone capsule (transducer) can operate normally. It is typically expressed by its lower and upper frequency limits.
A high-quality microphone capsule should ideally have a wide frequency range-preferably covering the full audible range of the human ear, which is approximately 20–20,000 Hz.
However, in practice, different applications have different requirements for frequency range. Sometimes, to enhance clarity and brightness, the high-frequency region is intentionally emphasized in the frequency response curve.
For applications like capturing low-frequency musical instruments, the curve may be designed to enhance the low-frequency response instead.
In voice pickup scenarios, the response curve is often optimized in the 150–5000 Hz range, which covers the most essential parts of human speech.
A perfectly flat frequency response curve only exists in theoretical instruments or test equipment. In real-world applications, achieving a completely flat response is very difficult.
Overall, the ideal frequency range and frequency response curve should be selected based on your actual application. The best microphone capsule is the one that matches your product's specific requirements.
