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Norsonic Sound Sources



Nor276 Dodecahedron Loudspeaker

The Nor276 is a high power loudspeaker with omnidirectional characteristics.

It fulfils the following standards: ISO 140-3 Annex C (Laboratory measurements), ISO 140-4 Annex A (Field measurements), and the ISO3382 Annex A (Reverberation Time measurements).

The output power level is up to 120 db re. 1pW for a pink noise signal.

The Nor276 has been designed for continuous operation for more than one hour at full power. It is designed to be used with Nor280 Power Amplifier only. Using other amplifiers may damage the speakers and will void the warranty.

The dimension is 332 mm (13”) diameter.

Reference sound source for Sound Power determination according to ISO 6926.

230V/50Hz or 115V/60Hz (specify when ordering).

Norsonic's Nor276 Webpage


Nor275 main

Nor275 Hemi-dodecahedron loudspeaker

A powerful sound source designed for building acoustics measurements per ISO-140/4 Annex A (Field measurements). The source provides uniform sound radiation. When used with the power amplifier Nor280, the high sound power level ensures accurate descriptors in measurement conditions that include high background levels, high sound insulation properties, and large room volumes.

Nor275 is designed for placement on the floor and uses the floor as a mirror for emitted sound. The loudspeaker is designed to operate at full power for more than one hour continuously.

The Nor275 is designed to be used with the Nor280 power amplifier only. Using other amplifiers may damage the speaker and will void the warranty.

  • Nor275 fulfill ISO 140-4 Annex A standard for airborne insulation measurements in field.
  • Powerful - 120 dB Lw
  • Lightweight (6 kg / 13.2 lb), portable and rugged design for field use.


Norsonic's Nor275 Webpage



Nor280 Power Amplifier

Our aim is to take the latest technology available to help our customers complete their measurements faster but without loss of precision. With the Nor280 we have again met this objective.This power amplifier is the 4th generation of specially designed units for building acoustic measurements from Norsonic. It is less than half the size and weight but twice as powerful as its predecessors; it replaces the Nor260 as the preferred amplifier to drive the Norsonic range of full and hemi dodecahedron instrumentation loudspeakers.


  • Specially designed for Building Acoustic measurements
  • Lightweight and rugged construction
  • Self contained noise generator
  • 500 Wrms output power
  • Emits 120 dB sound power level in the 50—5000 Hz frequency range when used with Norsonic dodecahedron loudspeakers types Nor275 or Nor276
  • Wireless remote control of noise generator (optional)
  • Equalization network to optimise acoustic output from speaker
  • Balanced signal input for low noise and limited cross talk problems


  • Sound insulation measurements
  • Reverberation time measurements
  • Absorption coefficient measurement


Norsonic's Nor280 Webpage

Norsonic Sound Sourced data sheet


Tapping Machines and Sound Sources