9.7mm Wide Cardioid Electret Condenser Microphone – High SPL for Headset, Conference & Live Voice

9.7mm wide cardioid electret condenser microphone capsule – high SPL voice capture

ECM-B9750UL45-T3-127 microphone – clear audio, high SPL handling, wide cardioid – professional voice applications

ECM-B9750UL45-T3-127 microphone – compact 9.7mm design, high SPL stability, optimized for dynamic voice applications

ECM-B9750UL45-T3-127 microphone – frequency response 100Hz–10kHz, wide cardioid, clear voice reproduction

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

High-fidelity 9.7mm wide-cardioid electret condenser microphone capsule with 72dB SNR and 127dB SPL handling. Ideal for professional headsets, high-SPL environments, conference microphones, and streaming/hosting 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-B9750UL45-T3-127
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -45 dB ± 2
Impedance: 1 kΩ
S/N Ratio: 72 dB
Max SPL: 127 dB
Operating Voltage: 4.5 Vdc
Frequency Response: 100 Hz ~ 10 kHz
Current Consumption: 600 μA

Tags: 3-Pad Electret 9.7mm Electret Vocal Mics

Overview

This 9.7mm wide-cardioid electret condenser microphone capsule is designed for high-fidelity professional voice applications in high SPL environments. It delivers low distortion, stable performance, and clear voice capture, making it perfect for noise-canceling headphones, conference systems, streaming/hosting microphones, and OEM/ODM high-end headset modules where higher sound pressure handling is required.

Key Features

🎯 Wide Cardioid Pattern – Natural voice capture with excellent background noise rejection and feedback resistance.
🎤 High SPL Handling (127dB @ THD ≤3%) – Maintains clarity even in loud or dynamic voice environments.
🔋 Wide Operating Voltage (1–10V DC) – Compatible with most professional wireless transmitters and preamp modules.
🔇 High-Fidelity, Low Noise Design (SNR 72dB A-weighted) – Ensures clean and intelligible voice reproduction.
⚙️ Low Impedance Output (≤1kΩ) – Guarantees stable signal transmission and easy integration.
💡 Compact 9.7mm Size – Ideal for headset and other high-end microphone assemblies.

Technical Specifications

Optimized for professional voice applications in high SPL environments, with stable performance and clear frequency response.

ECM-B9750UL45-T3-127

Parameter	Specification
Model
Type	Electret Condenser Microphone Capsule
Diameter	9.7mm
Directivity	Wide Cardioid
Sensitivity	-45 ±2 dB (0dB = 1V/Pa at 1kHz)
Signal-to-Noise Ratio	72 dB (A-weighted)
Maximum Input SPL	127 dB (THD ≤3%)
Impedance	≤1 kΩ
Frequency Response	100 Hz – 10 kHz
Operating Voltage	1.0 – 10.0 V DC (Standard 4.5V)
Current Consumption	≤600 μA
Voltage Drop Characteristic	-3 dB (Vs=4.5 → 3.0V)

Typical Applications

Professional headset microphones
Noise-canceling headphone microphones
Conference and meeting microphones
Streaming, hosting, and broadcast microphones
OEM / ODM high-end headset modules in high SPL environments

Advantages

This wide-cardioid electret capsule provides excellent ambient noise rejection, high feedback resistance, and low distortion. Its high-fidelity performance and high SPL capability ensure natural, clear voice reproduction even in loud or dynamic professional voice applications.

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.