Live Broadcast Microphone Capsule 25mm

The ECM-B2573UL33-23221 is a 25 × 7.3 mm unidirectional microphone capsule primarily used in broadcasting microphones, live streaming, and professional recording microphones. With a sensitivity of -33dB±2 and a signal-to-noise ratio of 77dB, it provides clear and reliable sound capture for high-quality audio applications.

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Minimum order quantities (MOQs) apply.
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🧪 Sample

Free (std. models) + shipping

🧭 Trial Order

From 200 pcs (1st order only)

📦 MOQ

5,000 pcs (mixed models allowed)

Model: ECM-B2573UL33-23221
Dimensions: 25 × 7.3 mm
Directivity: Unidirectional
Sensitivity: -33dB±2
Impedance: 2.2KΩ
S/N Ratio: 77dB
Max SPL: 110dB
Operating Voltage: 2Vdc
Frequency Response: 50Hz~10KHz

Tags: 25mm Electret High-SNR Mics Solder Pads Electret Vocal Mics

Technical Specifications

Our 2573 unidirectional large-diaphragm electret condenser microphone head features a high signal-to-noise ratio and low noise. It offers high fidelity, strong directionality, and excellent anti-interference capabilities, ensuring superior audio quality and performance.

Standard Test Circuit

Standard test setup with a 2.2kΩ bias resistor, 2V DC supply, and 1μF output capacitor.

Typical Frequency Response

The frequency response covers 50Hz to 16kHz, starting with a slight decline from 50Hz to 80Hz, followed by a minor rise and gentle fluctuations up to 5kHz. The response peaks near 8kHz before gradually decreasing.

Dimensions (UNIT: mm)

Appearance Dimension

Compact Φ25 × 7.3mm capsule with rear acoustic port for enhanced sound pickup.

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.