| Image | Model | Size | Pattern | Sensitivity | Type | Key Feature | Application |
|---|---|---|---|---|---|---|---|
|
ECM-F9750UL-51 | 9.7×5mm | Unidirectional | -51dB | Electret | Balanced sensitivity, voice-band optimized | Voice Amplifier |
| ECM-DM1508K150 | 15×8mm | Cardioid | -66dB | Dynamic | Strongest feedback rejection, high SPL tolerance | Extreme feedback / KTV |
| ECM-B1463UL34-683 | 14×6.3mm | Unidirectional | -34dB | Electret | High SNR 75dB, excellent voice clarity | Megaphone |
| ECM-DM1910K600 | 19×10mm | Unidirectional | -56dB | Dynamic | Natural feedback rejection, high durability | Handheld KTV / PA |
Unidirectional polar pattern
Picks up sound from the front direction only, naturally attenuating side and rear speaker output. This breaks the feedback loop at the source — no DSP required.
Balanced sensitivity selection
Target: -34dB ~ -66dB. Lower sensitivity reduces feedback risk by requiring closer speaking distance. Higher sensitivity options are suitable for megaphones and voice amplifiers where some distance is needed.
Frequency shaping
Optimized frequency response with attenuated high-frequency peaks. Reduces sharp resonant frequencies that cause squealing while maintaining clear voice intelligibility.
Dynamic vs Electret selection
Dynamic mics offer the strongest feedback rejection due to naturally lower sensitivity. Unidirectional electret mics provide cost-effective solutions for voice amplifiers and megaphones.
| Parameter | Requirement | Why It Matters |
|---|---|---|
| Polar Pattern | Unidirectional — No omnidirectional | Omni picks up speaker output from all directions — guaranteed to howl |
| Sensitivity | -34dB to -66dB | Lower sensitivity = less feedback risk |
| Frequency Response | 100Hz ~ 12kHz, attenuated high-frequency peaks | Reduces sharp resonant frequencies that cause squealing |
| SNR | ≥ 58dB | Ensures clean voice extraction from noise floor |
Quick Selection Guide
Choose by your device type — no complex calculations.
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