Nor275 Hemi-dodecahedron Loudspeaker
Floor-standing hemi-dodecahedron sound source for in situ airborne sound insulation measurements to ISO 16283-1. Back in production.
Overview
The Nor275 is a hemi-dodecahedron loudspeaker designed for in situ building acoustics measurements in accordance with ISO 16283-1. It is placed directly on the floor and uses the floor as a reflecting surface for the emitted sound, which gives uniform sound radiation from a compact, six-driver source. Driven by the Nor280 power amplifier with pink noise and equalisation, the Nor275 delivers a sou…
Key Features
- Meets the ISO 16283-1 Annex A requirements for field airborne sound insulation measurements
- Sound power level of 120 dB (Lin) with the Nor280 amplifier, pink noise and equalisation
- Hemi-dodecahedron design placed on the floor, using the floor as a reflecting surface
- Six 6-inch drivers
- Runs continuously at full power for more than one hour
- Lightweight (6 kg), portable and rugged for field use
- Back in production at Norsonic due to high market demand
Applications
- Airborne sound insulation between rooms per ISO 16283-1
- Field testing of partitions with high sound insulation
- Measurements in large room volumes or with high background noise
- Sound absorption measurements per ISO 354
- Airborne sound transmission measurements per ASTM E90 and ASTM E336
Technical Specifications
- Physical design: Hemi-dodecahedron
- Standards: ISO 16283-1, ISO 354, ASTM E90, ASTM E336
- Sound Power: 120 dB (Lin) with Nor280, pink noise and equalisation
- Drivers: 6 x 6 in
- Power (broadband): 100 W RMS (max), 500 W peak
- Impedance: 5.3 ohms
- Weight: 6 kg (13.2 lb)
- Amplifier: Nor280 only
Frequently Asked Questions
- Is the Nor275 available again?
Yes. Due to high market demand, Norsonic has resumed production of the Nor275 hemi-dodecahedron loudspeaker. Contact Norsonic Asia for availability and a quotation. - How does the Nor275 differ from the Nor283 dodecahedron?
The Nor275 is a hemi-dodecahedron with six drivers that stands on the floor and uses the floor as a reflecting surface. The Nor283 is a full dodecahedron with twelve drivers, mounted on a tripod at measurement height. - Which amplifier should I use with the Nor275?
Only the Nor280 power amplifier. Norsonic states that other amplifiers may damage the loudspeaker and will invalidate the warranty.
Application Guide
The Nor275 Hemi-dodecahedron Loudspeaker belongs to the Norsonic Sound Source range. See the Sound Source application guide for system configuration, compatible accessories, and applicable measurement standards.
Related Norsonic Products
- Nor280 Power Amplifier — Professional power amplifier for building acoustics loudspeaker systems.…
- Nor283 Dodecahedron Loudspeaker — Omnidirectional dodecahedron loudspeaker for building acoustics and room acousti…
- Nor277 Tapping Machine — Standard tapping machine for impact noise measurements in building acoustics tes…
Why Norsonic?
- Manufactured in Norway — decades of acoustic measurement heritage; all instruments designed and built in Norsonic AS, Lierskogen, Norway
- IEC 61672 Class 1 — highest accuracy class for professional and regulatory acoustic measurement
- International type approvals — PTB (Germany) and LNE (France); accepted by environmental authorities across the region
- 3-year manufacturer warranty — covers parts and labour; Norsonic Asia authorized service center support throughout the region
- Open data formats — .nox files work with NorReview and can be exported to CSV, Excel, and third-party analysis software
Calibration and Compliance
- All Norsonic instruments require periodic IEC 61672-3 calibration — Norsonic Asia provides factory-authorized calibration services with full DANAK-traceable certificates
- Calibration interval: 1 year for ISO 17025 accredited laboratories; 2 years for field instruments in non-accredited applications
- Field calibration check: use an IEC 60942 Class 1 sound calibrator (94 dB or 114 dB) before and after each measurement session
- Loaner instruments available during calibration to minimize project downtime — contact Norsonic Asia for loaner availability
Availability & Regional Support
Available from Norsonic Asia — the factory-authorized distributor for ASEAN, GCC, and South Asia. Instrument supply includes 3-year manufacturer warranty, factory-authorized calibration services, operator training, and after-sales technical support.
- Typical lead time: 3–6 weeks from order confirmation (ex-factory Norway)
- Countries served: Singapore, Malaysia, Thailand, Vietnam, Philippines, Indonesia, UAE, Saudi Arabia, Qatar, Kuwait, India, Bangladesh, Sri Lanka, and more
- Technical support: English and Arabic; response within 1 business day
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