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1/4-inchFree-field，20kHz，TEDS

M 643+A 835

  • 1/4-inchFree-field，20kHz，TEDS

  • M 643 + A 835 is a 1/4-inch pre-polarized free-field measurement microphone kit, designed to capture distortion-free true sound pressure levels prior to microphone placement in the sound field. It features TEDS functionality, enabling more convenient and rapid usage, especially facilitating quick calibration when using multiple microphone arrays.

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Description

Specifications

ParameterValue
TEDS FunctionYes
Dimensions1/4inch
Sound Field TypeFree field
Polarization Voltage0V（Pre-polarized）
Frequency Response10 - 20kHz ±2dB
Dynamic Range37.5dB（A）-155dB （1000 Hz 失真<3%）
Noise Floor37.5dB（A）
Sensitivity mV/Pa (dBV/Pa)5mV (-46.0dB) ± 2dB
IEC 61094-4 TypeWS3F
Maximum Output Voltage5.6V
Output Impedance＜50Ω
Supply Power2mA - 20mA（Typical4mA）
Pressure Equalization MethodPost-equalization
Connector TypeMicrodot(M5)
Operating Temperature-30°C to 85°C
Temperature Coefficient-0.012dB/℃
Humidity Coefficient＜0.1dB（0-90% no condensation ）
Relative Humidity0-90% no condensation
Static Pressure Coefficient/

Specifications

Types of Acoustic Fields

Free Field

Polarization voltages

0V（Prepolarized）

Frequency range

10 - 20kHz ± 2dB

Dynamic range

37.5dB（A）-155dB（1000 Hz  THD<3%）

background noise

37.5dB（A）

sensitivity  mV/Pa(dBV/Pa)

5mV (-46.0dB) ± 2dB

Maximum Output Voltage

5.6V

Output Impedance

<50Ω

Power Supply

2mA - 20mA（typical 4mA）

Pressure Equalization Method

Post-equalization

Connection

Microdot (M5)

Temperature range, operation

-30℃ to 85℃
Temperature range coefficient-0.012dB/℃

Temperature range, storage

Temperature：25℃±5℃，Humidity：50%±15%RH（Ensure the long-term stability of the sensor）

RH0 - 90% without condensation

Humidity coefficient

<0.1dB

Static pressure coefficient-0.011dB/kPa


Typical frequency response curve

屏幕截图 2026-04-16 153119.png

Dimensions：mm

M 643+A 835&A 811尺寸.png


The measuring microphones we produce are precision sensors, and all aspects related to production are strictly controlled, including material selection, production processes, testing control, and production environment.

图片1.pngAfter years of continuous improvement, we now use special nickel alloy materials as the core material for the diaphragm. Compared to other alloy materials, it exhibits higher sensitivity, lower distortion rate, and more stable long-term performance. The front body of the microphone is made of stainless steel, ensuring that the entire microphone maintains extremely robust structural characteristics even under various assembly conditions.

图片2.png

We adopt advanced production processes and fully automated precision machining equipment, which significantly reduces the accuracy errors caused by secondary clamping in traditional machining equipment. This greatly enhances the dimensional consistency, geometric accuracy, and overall quality stability of the products, providing reliable technical support for demanding application scenarios.

图片3.png

At the same time, we employ extremely rigorous testing and control measures, conducting quantitative testing on any links that may lead to product quality issues, and implementing test sequence control to prevent skip-station situations. The comprehensive MES control enables all data to be traceable, ensuring a high degree of consistency in sensor quality.

图片4.pngThe entire production process of all our microphones is strictly carried out in a dust-free workshop, which can minimize the amount of dust in the air, thus creating a stable and pure working environment for the sensors. This ensures a long and stable lifespan for the sensors and maintains their excellent performance throughout daily use.


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