G.R.A.S. 67HB 2 m CCP Hemisphere kit

Freq range: 3.15 Hz to 20 kHz
Dyn range: 17 dBA to 138 dB
Sensitivity: 50 mV/Pa

Measures incl. feet:
Diagonal 4716 mm
Height 2283 mm


The structure is made portable to achieve a high degree of freedom of location. This, combined with the easy, toolless assembly in minutes, enables you to save expensive anechoic chamber time and to offer on-site sound power diagnostics.

The microphone positions are clearly marked to ease the mounting and maintain measurement repeatability.

The G.R.A.S. 67HB-04 2 m CCP Hemisphere kit, 4 channels (4 key + 4 secondary) is ISO 3746:2011 B1/ANSI S12.56 compliant and includes:

  • 1x Hemisphere structure
  • 4x G.R.A.S. 46AE 1/2” CCP Standard Microphone Sets, cables, holders

The G.R.A.S. 67HB-05 2 m CCP Hemisphere kit, 10 channels (10 key + 10 secondary) is ISO 3744:2010 B2/ANSI S12.54 compliant and includes:

  • 1x Hemisphere structure
  • 10x G.R.A.S. 46AE 1/2” CCP Standard Microphone Sets, cables, holders

The G.R.A.S. 67HB-06 2 m CCP Hemisphere kit, 20 channels (20 key) is ISO 3745:2012 E2/ANSI S12.55 compliant and includes:

  • 1x Hemisphere structure
  • 20x G.R.A.S. 46AE 1/2” CCP Standard Microphone Sets, cables, holders

Typical applications and use

Depending on the size and the emitted acoustic level of the DUT, the hemispheres will allow sound power measurements on everything from small sized personal electrics to office machines and IT products, household appliances, power tools and smaller engines. The only restriction is, that the characteristic dimension of the DUT may be no more than half the measurement radius.


The hemispheres, 1 m or 2 m radius, are available as preconfigured kits with 4, 10 or 20 microphone sets in 3 variations; CCP, LEMO and low-noise LEMO. The microphone sets can be connected directly to all professional measurement systems and are as indicated available for both CCP and 7-pin LEMO inputs. If your system platform supports intelligent transducers according to IEEE 1451.4 (TEDS), the system can be set up to identify the microphone properties and position in the array.


All included microphone sets are delivered with individual calibration charts including sensitivity values and frequency responses. These sensitivity values can be used directly in your system setup.

For frequent measurement chain verification a reference sound source will be required. G.R.A.S. supplies 114 dB types for the standard microphone sets and a special 94 dB adapter for the low-noise sets. Depending on the use and your internal quality control requirements we recommend that the sets are re-calibrated at least every second year.

Performance and warranty

G.R.A.S. microphone sets are made of components from our proven standard portfolio and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness.

All parts are manufactured and assembled at the factory in Denmark by skilled and dedicated operators in a verified clean-room environment. The microphone diaphragm, body and unique protection grid are made of high-grade stainless steel and make the microphone set resistant to physical damage as well as corrosion caused by aggressive air or gasses.

This, together with the reenforced gold-plated microphone terminal which guarantees a highly reliable connection, enables us to offer 5 years warranty against defective materials and workmanship. The warranty for cables is 6 months.

Frequency range (±2 dB) Hz 3.15 to 20 k
Dynamic range lower limit with G.R.A.S. preamplifier dB(A) 17
Dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply dB 135
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 50
ANSI standard S12.56
Standard ISO 3746:2012
Weight g / oz 15,000 / 529.1
G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.


G.R.A.S. 67HB-04 2 m CCP Hemisphere kit 4 ch.
G.R.A.S. 67HB-05 2 m CCP Hemisphere kit 10 ch.
G.R.A.S. 67HB-06 2 m CCP Hemisphere kit 20 ch.


- 2 m structure
50 Microphone cable clips
G.R.A.S. 46AE 1/2" CCP Free-field Standard Microphone Set (1 per ch.)
G.R.A.S. AA0037 10 m BNC-BNC cable (1 per ch.)


G.R.A.S. RA0277 Flight cases (2)
  • One with foam tailored for the microphones and cables
  • One with foam tailored for the structure and microphone holders
G.R.A.S. 42AG

 Multifunction Sound calibrator (94 dB or 114 dB)

G.R.A.S. 42AP

 Intelligent Pistonphone (114 dB)

G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.