9.7mm Cardioid Electret Microphone Insert for KTV Karaoke

Cardioid Electret Microphone Insert for KTV Karaoke 9.7mm

The ECM-F9750UL-47 is a 9.7 × 5 mm unidirectional microphone capsule tailored for custom microphone heads in products like karaoke systems and Bluetooth microphones. With a sensitivity of -47dB±2 and a signal-to-noise ratio of 55dB, it ensures reliable audio performance.

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Minimum order quantities (MOQs) apply.
For audio brands & OEMs
📞 Contact us for orders & inquiries.

🧪 Sample

Free (std. models) + shipping

🧭 Trial Order

From 200 pcs (1st order only)

📦 MOQ

5,000 pcs (mixed models allowed)

Model: ECM-F9750UL-47
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -47dB±2
Impedance: 680Ω
S/N Ratio: 55dB
Max SPL: 110dB
Operating Voltage: 1.5Vdc
Frequency Response: 100Hz~10KHz

Tags: 9.7mm Electret Solder Pads Electret Vocal Mics

Technical Specifications

Our 9750 microphone head, also known as the K-song microphone core, is a 9mm microphone featuring dual capacitors for effective RF interference shielding. It utilizes a stable and reliable Korean RF JFET for enhanced performance and durability.

Standard Test Circuit

Tested under RL=680Ω, VS=1.5V, and C=1μF configuration for standard performance verification.

Typical Frequency Response

Response rises from 100Hz to around 800Hz, stays relatively flat, then peaks near 3kHz before gradually tapering off toward 12kHz.

Dimensions (UNIT: mm)

Appearance Dimension

Microphone capsule measures 9.7mm in diameter and 5.0mm in height, with a front dust mesh and a rear acoustic port for clear sound capture.

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.