9.7mm Cardioid Dual-Chamber Microphone Capsule for KTV Karaoke

Cardioid Dual-Chamber Microphone Capsule for KTV Karaoke 9.7mm

The ECM-F9750UL-48 is a 9.7 × 5 mm unidirectional microphone capsule designed for karaoke applications. Featuring a dual-chamber design, it offers a sensitivity of -48dB±1 and a signal-to-noise ratio of 55dB, providing excellent audio quality.

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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-F9750UL-48
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -48dB±1
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 cardioid microphone, designed for karaoke, features a dual-chamber design for enhanced performance.

Standard Test Circuit

Test conditions: Load resistor (RL) = 680Ω, Supply voltage (VS) = 1.5V, Coupling capacitor (C) = 1μF.

Typical Frequency Response

The frequency response covers 100Hz to 10kHz. The curve shows a steady rise from 100Hz to around 1kHz, followed by a relatively flat and mildly rising mid-range. A gentle roll-off begins near 4kHz. This makes the capsule suitable for voice pickup with a balanced tonal character.

Dimensions (UNIT: mm)

Appearance Dimension

Diameter: 9.7mm; Height: 5.0mm. The front features a dustproof mesh, and the back includes a sound port for directional 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.