Waterproof Dynamic Microphone Capsule for Marine VHF Intercoms

ECM-DMP-21F waterproof dynamic microphone capsule for marine intercoms

ECM-DMP-21F dynamic microphone capsule features: waterproof, single-directional, 31.5×16.2mm, noise reduction

ECM-DMP-21F microphone capsule dimensions and frequency response curve (100–8000Hz)

ECMIC microphones 12,000 m² factory with 6M+ units monthly output and ISO/CE certifications

ECMIC microphones automated production line overview, showing assembly and quality control process

Waterproof 31.5×16.2mm single-directional dynamic microphone capsule for marine VHF intercoms, delivering clear voice pickup in noisy and wet environments.

🚫 Factory direct sales only – no retail.
Minimum order quantities (MOQs) apply.
For intercom & headset makers
📞 Contact us for orders & inquiries.

🧪 Sample

Free (std. models) + shipping

🧭 Trial Order

From 200 pcs (1st order only)

📦 MOQ

3,000 pcs (mixed models allowed)

Model: ECM-DMP-21F
Dimensions: 31.5 × 16.2 mm
Weight: 18.5 g
Directivity: Unidirectional
Sensitivity: -60 dB ± 3
Impedance: 200 Ω
Frequency Response: 100 Hz ~ 8 kHz

Tags: 30mm Dynamic Intercom Mics

Technical Specifications

The ECM-DMP-21F is a waterproof single-directional dynamic microphone capsule designed for marine VHF intercoms and rugged outdoor communication devices. It features a unidirectional pickup pattern with a frequency response optimized for clear speech between 100Hz and 8kHz, ensuring intelligible voice transmission even in noisy or wet conditions.

Built with moisture-resistant components and a sealed housing, the ECM-DMP-21F delivers reliable waterproof performance. Its compact 31.5 × 16.2 mm form factor and 200Ω output impedance make it easy to integrate into various marine and outdoor intercom systems requiring durability, stability, and consistent voice clarity.

Exploded View & Parts List

ECM-DMP-21F Exploded View: key components including waterproof sponge, diaphragm, coil, magnet assembly, and holder

Structural decomposition showing waterproof sponge, protective cover, diaphragm, coil, magnetic steel, iron pots, holder, and PCB assembly.

Frequency Response Curve

ECM-DMP-21F Frequency Response: primarily focused within the 100Hz to 8kHz range for optimized speech clarity

Frequency response focused within the 100Hz to 8kHz range for optimized speech clarity.

Dimensions (UNIT: mm)

ECM-DMP-21F Dimensions: 31.5×16.2mm compact waterproof dynamic microphone capsule

Compact 31.5 × 16.2 mm waterproof housing design.

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.