Nor280

Power amplifier

The Nor280 Power Amplifier is a robust, professional amplifier engineered for demanding building acoustics measurements.

The Nor280 Power Amplifier is a dedicated power source for demanding building acoustics measurements. With a low weight of only 3.5 kg and a robust, field-ready housing, it is easy to transport between rooms and sites while delivering stable, reliable performance over years of intensive use.

Why choose the Nor280?

At Norsonic, we focus on helping you work efficiently while maintaining traceable, standards-compliant results. The Nor280 is engineered to support faster measurement workflows without sacrificing accuracy or reproducibility. Fully aligned with relevant international acoustic standards, it is a trusted choice for acousticians, consultants, and engineers who require dependable performance in professional building acoustics applications.

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Engineered for professional building acoustics

The Nor280 is developed for demanding building and room acoustics applications, supporting:

Sound insulation measurements
Reverberation time measurements
Absorption coefficient measurements

High-performance amplifier

The class D power stage combines low weight with high output and stable operation. It delivers up to 500 W RMS into a 4 Ω load with output currents up to 35 A, providing reliable excitation even in large rooms and in demanding test configurations.

Integrated noise generator

The integrated noise generator offers Pink, White, and Red/White noise excitation signals. The output level can be adjusted in 5 dB steps down to –35 dB, enabling precise level setting across a wide range of test conditions.

Practical remote operation

A wireless on/off remote control allows you to start and stop the signal from another room, supporting efficient workflows and reducing disturbance at the measurement position. The balanced line input minimizes crosstalk and induced noise when using long signal cables, ensuring clean and stable measurement signals.

Features

Standards

Specifications

Accessories

Downloads

Features

Specially designed for Building Acoustic measurements
Lightweight and rugged construction – only 3.5 kg!
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/Nor276 or Nor283.
Wireless remote control of noise generator.
Equalization network to optimise acoustic output from speaker.
Balanced signal input for low noise and limited cross talk problems.

Standards

ISO 717-1, ISO 717-2, ISO 717-3
ISO 1793-1, ISO 1793-2, ISO 1793-3
ISO 10140-2, ISO 10140-3
ISO 10140-5 Annex D
ISO 10848-1, ISO 10848-2, ISO 10848-3
ISO 354
ISO 3382-2

Specifications

Output: Short-circuit and over-temperature protected
Output connector: Speakon NL4MP
Output power:
500 WRMS RMS into 4ohm
250 WRMS RMS into 8ohm
THD+N < 0.1%
The built-in LP and HP filters ensure that the output power matches the Norsonic Nor275 and Nor276 series of dodecahedron loudspeakers Peak power: >1 kWPEAK into 4ohm
Output current: Maximum 35 A

Input: Balanced input to avoid ground loops and cross talk to signal cables
Input connector: XLR
Input sensitivity: 1.0 VRMS
Input impedance: 10 k//220 pF

Temperature: –20 to +35 °C
Rel. Humidity: 0–90%

Enclosure class: IP20

Mains: 220 VAC (±10%) or 110 VAC (±10%)
Fuse: T 3,15A (220 V), T 6A (110 V)

Dimensions: (D x W x H):
275 × 110 × 246 mm / 11 x 4.3 x 9.7 inch
Weight: 3.5 kg

EMC and Safety Standards: EN 55103-1, EN 55103-2, IEC 61340-5 part 1&2, IEC 61010, FCC part 15b part 1&2
CE Conformity: EMC compliance according to EN 50081-1 and EN 50082-1, Safety according to EN 61010-1-1993 and Machine directive 89/392

Accessories included
Mains cable, Output connector, Wireless on/off remote control