High-Fidelity 9.7mm Wide Cardioid Electret Condenser Microphone – Headset, Conference & Streaming

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

ECM-B9750UL45-T3-110 microphone – pure sound, hi-fi voice, low noise – for headset & conference

ECM-B9750UL45-T3-110 microphone – compact 9.7mm design, stable voltage, easy integration

ECM-B9750UL45-T3-110 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 110dB SPL handling. Ideal for professional headsets, noise-canceling devices, conference microphones, and streaming/hosting applications.

Model: ECM-B9750UL45-T3-110
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -45 dB ± 2
Impedance: 1 kΩ
S/N Ratio: 72 dB
Max SPL: 110 dB
Operating Voltage: 4.5 Vdc
Frequency Response: 100 Hz ~ 10 kHz
Current Consumption: 600 μA

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Samples available
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Small Batch

From 200 pcs
Engineering validation

MOQ

5,000 pcs
Standard production

Certified

RoHS & UL
Quality & safety standards

Overview

This 9.7mm wide-cardioid electret condenser microphone capsule is designed for high-fidelity professional voice applications in standard 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.

Key Features

🎯 Wide Cardioid Pattern – Natural voice capture with excellent background noise rejection and feedback resistance.
🎤 High SPL Handling (110dB @ THD ≤3%) – Maintains clarity in typical professional 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, with stable performance under typical SPL and clear frequency response.

Parameter	Specification
Model	ECM-B9750UL45-T3-110
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	110 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

Advantages

This wide-cardioid electret capsule provides excellent ambient noise rejection, high feedback resistance, and low distortion. Its high-fidelity performance ensures natural, clear voice reproduction in standard 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.