Unidirectional Dynamic Microphone for Karaoke & Conference Systems

High-performance unidirectional dynamic microphone capsule with -54dB sensitivity and 600Ω impedance. Ideal for karaoke, home audio, and conference voice systems. Clear audio, noise reduction, durable design.

Model: ECM-DM-30C
Dimensions: 28.1 × 24 mm
Weight: 10 g
Directivity: Unidirectional
Sensitivity: -54 dB ± 3
Impedance: 2 kΩ
Frequency Response: 50 Hz ~ 13 kHz

Request Information / Sample

Tell us your project stage. Our engineering team will respond accordingly.

Lead Time

Samples: 1–3 weeks
Mass production: 2–4 weeks

Customization

Application-based engineering support
Structure / sensitivity / acoustic tuning

MOQ

3,000 pcs
Per model / per production batch

Certification

RoHS & UL compliant
Industrial reliability assured

Technical Specifications

The ECM-DM-30C is a dynamic microphone capsule engineered for voice-driven applications, including karaoke sound systems, home audio, and speech conference systems.

With a frequency response of 50Hz to 13kHz, it delivers clear and intelligible speech. Its unidirectional polar pattern (≥10dB) minimizes ambient noise, while 600Ω±15% impedance ensures compatibility with various audio systems.

The compact and lightweight design fits handheld housings and integrated voice devices, providing stable, reliable performance in entertainment and professional communication scenarios.

Exploded View & Parts List

ECM-DM-30C Exploded View: 8-component microphone assembly

Component breakdown: 1. Sponge 2. Cover 3. Diaphragm 4. Coil 5. Magnetic steel 6. Iron pots 7. Holder 8. PCB+Tin

Frequency Response Curve

Response Curve

Frequency response spans 50Hz to 13kHz, providing balanced mids, smooth highs, and controlled lows, ensuring clear voice reproduction in karaoke, home audio, and conference environments.

Dimensions (UNIT: mm)

ECM-DM-30C Dimension Diagram: Φ28.1×24mm

Dynamic microphone capsule with Φ28.1 × 24mm size, designed for reliable voice capture in professional and consumer audio applications.

Reliability Tests

High Temperature Test: Microphone subjected to +60℃ ±3℃ for 96 hours with 20-50% humidity, followed by 6 hours of normal temperature lay.

Low Temperature Test: Microphone subjected to -25℃ ±3℃ for 96 hours with 20-50% humidity, followed by 6 hours of normal temperature lay.

Humidity Test: Microphone exposed to 40℃ and 90-95% relative humidity for 96 hours, followed by 6 hours of normal temperature lay.

Temperature Cycle Test: Microphone subjected to rapid temperature changes from normal temperature to +60℃ ±3℃ for 1 hour (normal temperature lay for 3 hours) and then to -25℃ ±3℃ for 1 hour (normal temperature lay for 3 hours).

Sensitivity Stability: Sensitivity remains within ±3dB of the initial sensitivity after each environmental test.

Sampling Process

Confirm customer requirements:

Review product application, microphone capsule specifications, usage scenarios, and sound quality needs.

Recommend and specify:

Provide recommended microphone capsule models and detailed specifications for customer evaluation.

Sample provision and testing:

Deliver microphone samples for customer testing and feedback purposes.

Optimize and finalize:

Refine microphone design based on feedback, finalize samples, and proceed to mass production upon quality approval.

Quality Assurance

Conducting sampling inspections of incoming materials to ensure compliance with standard requirements.

Performing inspection audits to ensure the stability and control of the entire manufacturing process.

Conducting pre-shipment inspections to ensure that products meet established quality standards.

Acoustic Laboratory

Testing of background noise, sensitivity, frequency response curve, and directionality indicators.

Verification of the impact of different circuits, structural dimensions, materials, and processes on indicators.

Reliability testing at both the new product design stage and the mass production regular stage.

Automatic Workshop

Utilizing fully automated production lines to ensure high efficiency and consistency.

Equipped with state-of-the-art facilities, including a 10,000-level dust-free workshop.

Employing a rigorous 21-step process to guarantee product stability.