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Hemi Dodecahedron Loudspeaker

Product Code: Nor250

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.

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.

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


Physical design Hemi-dodecahedron Sound power output: Using the Nor280 with pink noise, and equalisation: 120 dB (Lin) Speakers: 6×6” Power (broadband): 100 WRMS (max) Peak 500 W Impedance: 5.3 Ω Diameter: 332 mm (13”) Height: 195 mm (7.6”) Weight: 6 kg (13.2 lb) Accessories incl.: - Speakon NL4FC plug replaced by a 5m assembled cable, if ordered with Nor280

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