Microphone Array Sphere80/120 AC Pro


80 or 120 channel microphone array for various interior measurement scenarios

This spherical 80 or 120 channel microphone array is primarily designed for applications in enclosed spaces. The omnidirectional characteristics of the array make it perfect for 3D applications, for example in room acoustics. In combination with our cutting-edge software NoiseImage we offer unique 3D functionality. The 120 channel array can be operated on a mcdRec data recorder, the 80 channel array connects to the mobile gt-432 data recorder too.



For larger 3 dimensional environments

Depending on a signal’s spectral composition, the recommended measurement distance varies between 0.5 and 25 meters. Longer ranges are possible for measurements in considerably higher 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.

The array design is optimized to provide the highest spatial resolution as well as map dynamic, possible given the number of microphones used. Additionally, the array design effectively minimizes partial reflections, sound pressure doubling effects on the surface, and resonance effects between the measured object and the array. Furthermore, the sphere geometry minimizes aliasing effects. As this microphone array acts omnidirectional, the beamforming results are normally mapped on a scanned 3D point cloud or 3D CAD model of the measurement object, to be imported in the NoiseImage software.

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 data recorder via differential SymBus microphone connector cables (max. 20 m). The array comes with an integrated fixed focus USB camera. 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 60 cm
Weight 2.1 kg
Video camera Intel® RealSense™ Depth Camera D435
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 80 or 120
Recommended measurement distance > 0.5 m
Acoustic mapping range 9 dB – 130 dB (Sphere80)
8 dB – 130 dB (Sphere120)
Backward attenuation > -16 dB (Sphere80)
> -21 dB (Sphere120)
Recommended mapping frequencies 185 Hz – 20 kHz (Sphere80)
187 Hz – 20 kHz (Sphere120)
Dynamic range
(Distance to the source: 1 m;
calculation points: 90.000)
13 dB – 17 dB (Sphere80)
15 dB – 18 dB (Sphere120)
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


Sphere80 Acoustic Camera Datasheet

Sphere120 Acoustic Camera Datasheet

Acoustic Camera Overview. The Original.

Acoustic Camera. Listening With Your Eyes.

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