Electret Microphone for Voice Recorders – High Sensitivity, Full Range

ECM-B4015AP28-1046 Electret Microphone Capsule – Omnidirectional, High Sensitivity, Compact Design

Voice Recorder Electret Microphone – ECM-B4015AP28-1046 with Full-Range Response and Clear Sound Capture

Compact omnidirectional electret mic with high sensitivity and clear vocal reproduction, ideal for voice recorders, conference systems, and space-constrained audio applications.

🚫 Factory direct sales only – no retail.
Minimum order quantities (MOQs) apply.
Suitable for brand owners and manufacturers only.
📞 Please contact us to discuss your project and order details.

🧪 Sample

Free sample – shipping extra

🧭 Trial Order

From 500 pcs (1st order only)

📦 MOQ

5,000 pcs (mixed models allowed)

Model: ECM-B4015AP28-1046
Directivity: Omnidirectional
Sensitivity: -28dB±2
Impedance: 2.2KΩ
S/N Ratio: 58dB
Max SPL: 100dB
Operating Voltage: 2Vdc
Frequency Response: 50Hz~20KHz

Tags: 4mm Electret Conference Mics Solder Pads Electret

Technical Specifications

The ECM-B4015AP28-1046 is a premium Φ4×1.5mm omnidirectional microphone capsule designed for high-fidelity voice recording. Featuring an exceptional sensitivity of -28dB±2 and extended frequency response from 50Hz to 20kHz, it delivers superior audio capture with outstanding clarity across the full vocal spectrum.

Built around a precision Korean RF mic core, this compact capsule maintains stable performance with a 58dB signal-to-noise ratio, making it ideal for professional voice recorders, conference systems, and high-end audio applications where space and quality are paramount.

Standard Test Circuit

ECM-B4015AP28-1046 Test Circuit: 2.2kΩ bias, 2V DC, 1μF output

2.2kΩ bias resistor, 2V DC supply, 1μF output capacitor. Optimized for full-range voice recording.

Typical Frequency Response

ECM-B4015AP28-1046 Frequency Response: 20Hz-10kHz flat, gentle roll-off above 10kHz

Flat response through 50Hz-10kHz with natural roll-off above 10kHz.

Dimensions (Unit: mm)

ECM-B4015AP28-1046 Dimensions: Φ4×1.5mm ultra-compact design with dust mesh

Φ4×1.5mm ultra-compact housing with front dust mesh (sealed back).

Packaging Overview

Standard packaging: 100 pcs per small box.
10 small boxes (1,000 pcs) are combined into one medium carton.
Several medium cartons are further packed into a large outer carton.
Pin-type microphones are protected with foam inside the small box.
Other types are packed directly or sealed in anti-static bags.

Reliability Tests

High Temperature Test: Microphone subjected to +80℃ for 100 hours, followed by 3 hours at room temperature.

Low Temperature Test: Microphone subjected to -40℃ for 100 hours, followed by 3 hours at room temperature.

Humidity & Heat Test: Microphone exposed to +55℃ and 85% relative humidity for 100 hours, followed by 3 hours at room temperature.

Thermal Shocking Test: Microphone subjected to [+80℃ 0.5H → room temp 1H → -40℃ 0.5H → room temp 1H] for 10 cycles, then exposed to room temperature for 3 hours.

Vibration Test: Microphone subjected to two hours of vibration in x, y, and z directions with frequencies of 10-55Hz and a 1.52mm amplitude.

Drop Test: Microphone dropped 5 times from a height of 1.0 meter onto a slippery marble floor, without packaging, and still performs normally.

Storage and Operating Temperature Range: Suitable for environments ranging from -35℃ to +60℃.

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.