The ideal frequency range for an electret condenser microphone capsule depends heavily on the target application. Below is a practical reference guide.
1. General Recommended Ranges
Hi-Fi Recording / Music Applications
20 Hz – 20 kHz (matching the full range of human hearing). Captures complete sonic detail. The frequency response curve should be as flat as possible, ideally within ±2 dB.General Consumer Electronics
100 Hz – 10 kHz. Covers most voice and basic audio needs at a cost-effective price point.High-Quality Voice / Multimedia
40 Hz – 15 kHz. Balances a sense of low-end atmosphere with high-frequency detail, suitable for voice recorders, conference systems, and similar devices.Dedicated Voice Communication
300 Hz – 3.5 kHz. Optimized for telephony and two-way radios. Effectively attenuates low- and high-frequency noise to maximize speech clarity.
2. Selection Guide by Application
Music Recording / Professional Audio
Recommended range: 20 Hz – 20 kHz. Key advantage: full-spectrum transparency, preserving instrument harmonics and spatial ambience.Smartphones / Smart Speakers
Recommended range: 100 Hz – 12 kHz. Key advantage: optimal balance of cost and performance, meeting the demands of voice assistants and clear call quality.Conference / Interview Recording
Recommended range: 40 Hz – 18 kHz. Key advantage: clean vocal capture while retaining essential environmental cues.In-Vehicle / Telephony
Recommended range: 300 Hz – 3.5 kHz. Key advantage: focuses on the critical speech band to enhance intelligibility in noisy environments.
3. Important Technical Notes
The frequency response range refers to the frequency band in which the microphone’s sensitivity remains within ±3 dB (or ±2 dB for high-end models).
A wider frequency range is not inherently better. The range should be chosen based on the actual use case; over-specifying bandwidth can unnecessarily increase cost and introduce unwanted noise.
Premium electret capsules achieve a wider, flatter frequency response through optimized diaphragm materials and advanced structural design.