Prevent acoustic feedback and squealing at the source. Uni-directional design with mid-low sensitivity — ideal for conferencing, PA, KTV, and classroom environments.
Heavier diaphragm, lower sensitivity, naturally immune to feedback. Ideal for handheld and high-SPL environments.
Cost-effective uni-directional solution for conference goosenecks, classroom mics, and fixed installations.
Picks up sound from front direction only, naturally attenuates side and rear speaker output. Breaks the feedback loop at the source — no DSP required.
Target: -40dB ~ -60dB. Lower sensitivity means less ambient and speaker sound is picked up, making it much harder to trigger feedback howling.
200Hz ~ 10kHz with attenuated high-frequency peaks. Reduces sharp resonant frequencies that cause squealing while maintaining clear voice intelligibility.
SNR ≥ 60dB ensures clean voice extraction. SPL ≥ 110dB handles loud PA environments without distortion.
| Parameter | Requirement | Why It Matters |
|---|---|---|
| Polar Pattern | Uni-directional — No omni-directional | Omni picks up speaker output from all directions, guaranteed to howl |
| Sensitivity | -40dB ~ -60dB | Lower sensitivity = less feedback risk |
| Frequency Response | 200Hz ~ 10kHz, attenuated high-frequency peaks | Reduces sharp resonant frequencies that cause squealing |
| SNR | ≥ 60dB | Ensures clean voice extraction from noise floor |
| SPL | ≥ 110dB | Handles loud PA environments without distortion |
| Application | Recommended Model | Key Characteristics |
|---|---|---|
| Handheld KTV / PA System | ECM-DM1910K600 | Dynamic, high SPL tolerance, natural feedback rejection |
| Conference Gooseneck / Classroom | ECM-B6027AML38-728 | Uni-directional electret, compact, voice clarity |
| Headset / Wearable | ECM-B4015AL38RC-L10 ECM-B4015AL38RC-L25 | Ultra-compact, uni-directional, fits small devices |
| High-noise / Strong feedback environment | ECM-DM1508K150 | Dynamic with strongest feedback rejection |
Choose by your device type — no complex calculations.
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