Microphone Array Ring72 AC Pro


72 channel beamforming microphone array

This 72 channel ring array is designed for applications in acoustic labs and the free field. The lightweight array body is designed as slim as possible and is made of aluminum. This ensures easy handling and accurate microphone positioning. Depending on your requirements, 100 cm, 120 cm and 140 cm versions can also be provided.

This array can be operated with the data recorder.



Measuring larger objects

Depending on a signal’s spectral composition, the recommended measurement distance varies between 1.5 and 20 meters. Longer ranges are possible for measurements in considerably mid and high frequency ranges. The wiring of the microphones is enclosed in and protected by the array body which guarantees the best possible acoustic transparency to measure accurate sound levels.

Other features:
  • Provides the highest spatial resolution.
  • A high depth of field (to see all sources in one acoustic map).
  • Minimizes partial reflections and resonance effects between the measured object and the array.

Furthermore, the ring geometry minimizes aliasing effects which are easy to interpret as they indicate possible source locations.

The built-in studio microphones have an extremely linear frequency response. All are carefully hand-selected and calibrated to ensure stable sound pressure levels (+/- 0.5 dB). To allow long distances, the array is connected to the mcdRec data recorder via differential SymBus microphone connector cables (max. 20 m). The array comes with an integrated fixed focus camera, which can be supplied as USB or Ethernet version, delivered in different sensor sizes, resolutions and frame rates. The included high-end Manfrotto tripod allows a set up in almost any measurement environment imaginable. Array and tripod are supplied in a transport case and bag respectively.

Technical Data

Array-body diameter 120 cm (100 cm or 140 cm diameters on request)
Weight 4 kg
Video camera

Intel® RealSense™ Depth Camera D435
Optional: Baumer VCXG-25C

Resolution 1920 x 1080 (Full HD)
Microphones Electret condenser capsule
+ special designed preamplifier
Frequency response 20 kHz – 60 kHz (< 15 dB)
100 Hz – 15 kHz (< 0.5 dB)
20 Hz – 20 kHz (< 3 dB)
Max. sound pressure level 130 dB at 3 % THD
Noise level 27 dB(A)
Sensitivity 20 mV/Pa
Channels 72
Recommended measurement distance > 0.5 m
Acoustic mapping range 10 dB – 130 dB
Recommended mapping frequencies 105 Hz – 20 kHz (60 kHz)
Dynamic range
(Distance to the source: 1 m;
calculation points: 90.000)
8 dB – 12 dB, up to 50 dB with
advanced algorithms
Ingress protection code IP20
Cable length to data recorder up to 20 m (on request: 50 m)
Operating environment 0 °C – 35 °C, up to 80 % RH (RealSense)
0 °C – 45 °C, up to 80 % RH (Baumer)


ACOUSTIC CAMERA: Complete Setup and Measurement AC Pro System

The Acoustic Camera Pro systems of gfai tech GmbH promise a simple and fast handling. Due to its quick and easy setup, the Acoustic Camera is ready for use within 1.50 minutes, and first results are available just as quickly. All our arrays are portable and can be set up by just one person. Due to the advantageous cable assemblies, even non-experts can connect the measuring system with just a few clicks. Different arrays in various shapes, sizes and configurations can be found in the portfolio of gfai tech GmbH. Whether for small or large measurement objects, low or high frequencies, near or far field measurements, we have the right microphone array for every application. The Acoustic Camera AC Pro system is developed fully in-house here in Berlin. It comprises a Microphone Array, the software NoiseImage and a Data Recorder. Hardware for the measurements and software for analysis and evaluation can be extended by different Accessoires for additional functions. The components are fully integrated and cover the whole process from measurement to analysis and evaluation.


Acoustic Camera Ring72

Acoustic Camera Overview. The Original.

Acoustic Camera. Listening With Your Eyes.

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