Measurement Microphone Preamp MI Series
Pursuing the precision of acoustic measurement. The MI series measurement microphones from Ono Sokki achieve both high sensitivity and wide bandwidth.
Improvement of automotive quietness, abnormal noise inspection of home appliances, vibration analysis of precision instruments. High-precision sensors that do not miss subtle air vibrations are essential for "accurate acoustic measurements" required in manufacturing sites. 【Features】 The MI series from Ono Sokki is a measurement microphone with a wide lineup ranging from the industry-standard 1/2 inch to ultra-high frequency compatible 1/4 inch. ● High sensitivity and low noise design: Achieves accurate data collection without distortion, from faint sounds to high sound pressure. ● Excellent environmental resistance: Maintains minimal sensitivity changes even in harsh field environments, ensuring reliability for long-term measurements. ● Easy setup: The preamplifier integrated model compatible with BNC connectors allows for smooth connection to acoustic analyzers (FFT analyzers). You can choose the MI series according to your application, from research and development to inline inspection. The MI series visualizes sound and strongly supports the improvement of product quality and reduction of development time for our customers, providing a solution for acoustic measurement.
basic information
【MI-1271】 This is a precision-grade 1/2 inch back electret microphone. By adopting a laser-welded fixation method for the titanium diaphragm, it achieves extremely high stability. Additionally, it features a wide temperature and humidity range (-30 °C to 80 °C / 0 to 90 %RH) and a broad frequency range (1 Hz to 20 kHz), making it a high-performance microphone capable of meeting various applications such as environmental noise measurement in high temperature and humidity environments, measurement of ultra-low frequency sounds (up to 20 Hz), and sound measurement during cold start tests of automobiles. 【MI-3170】 This is a preamplifier for 1/2 inch back electret condenser microphones, which can be used in combination with the MI-1271 microphone. With the adoption of the CCLD (constant current drive) method and BNC connector, it can be directly connected to many CCLD-compatible amplifiers and analysis equipment. When combined with the MI-1271, it covers the measurement range of ultra-low frequencies starting from 1 Hz and achieves a wide operating temperature range (-30 °C to 80 °C). *For more details, please refer to the PDF document or feel free to contact us.*
Price information
【Microphone】 MI-1271: ¥126,500 (tax included ¥139,150) MI-1235: ¥78,000 (tax included ¥85,800) MI-1433: ¥43,800 (tax included ¥48,180) MI-1531: ¥400,000 (tax included ¥440,000) 【Preamp】 MI-3170 (1/2 inch): ¥92,400 (tax included ¥101,640) MI-3111: ¥39,900 (tax included ¥43,890) MI-3140: ¥350,000 (tax included ¥385,000)
Price range
P3
Delivery Time
OTHER
The delivery time may vary depending on the quantity, so please feel free to contact us.
Applications/Examples of results
1. Evaluation of power window switch quality 2. Evaluation of the running sound of the evangelist 3. Evaluation of the quietness of power seat motors 4. Measurement of the low sound power level in printer standby mode 5. Measurement of noise from outside air conditioning 6. Evaluation of speaker frequency characteristics *For details of the case studies, please download the catalog.*
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News about this product（2）
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Exhibiting at "Maintenance Resilience TOKYO 2026"
We will be exhibiting at "Maintenance Resilience TOKYO 2026" (the 50th Plant Maintenance Show), which will be held at Tokyo Big Sight from July 15 (Wednesday) to July 17 (Friday), 2026. Experience our latest measurement solutions, featuring the "Portable Vibration Meter VW-3100," which integrates the three essential elements of "listening," "measuring," and "judging" for on-site vibration measurement into one device. As a manufacturer of measuring instruments, Ono Sokki will leverage our long-standing expertise in sensing technology and signal processing to solve your vibration measurement challenges. Additionally, we will broadly propose measuring instruments, judgment devices, detectors, and sensors related to acoustics, vibration, rotation, speed, temperature, and voltage for predictive maintenance of production equipment and product inspection. 【Exhibited Products】 Portable vibration meter, acoustic vibration analysis system, FFT comparator, vibration comparator, sound level meter, accelerometer, laser in-plane speed meter, digital tachometer, rotation detector, digital handheld tachometer, wireless measurement system (temperature and voltage).
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Exhibiting at the "2026 NAGOYA Automotive Technology Exhibition"
Our company will exhibit at the "Automotive Technology Exhibition 2026 NAGOYA" held at Aichi Sky Expo from June 17 (Wednesday) to June 19 (Friday) and at the online exhibition "Automotive Technology Exhibition ONLINE STAGE 2." At the venue, we plan to showcase mainly our latest products under the theme "Optimal Solutions from Measurement and Simulation | Solutions to Improve Development Efficiency." 【Measurement Solutions Supporting Next-Generation Mobility Development】 Autonomous Driving: Evolved "ADAS-VILS" for complex simulations Automated Measurement: "FAMS-R6" that automates and visualizes testing with connected technology, along with remote monitoring systems Acoustics and Vibration: Comprehensive solutions from a sensory evaluation web application to high-precision "O-Solution" and laser Doppler vibrometers Integrated Measurement: Non-contact thickness gauges, tachometers, and various sensor groups Electrification: Wireless measurement platforms and thermal management/TPA benchmarking We propose reliable "safety" and "evolution" that closely aligns with the field.
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Our technology supports solutions in various fields. With technologies in sensing, measurement, control, data processing, and precision mechanisms, along with a total technology that integrates them, we are able to provide various solutions that meet the needs of production sites. Moving forward, we will continue to leverage our diverse technological capabilities to challenge the development of high-value-added products and systems that attract attention across different industries and sectors.