Supreme Acoustics Research Limited
Supreme NAP Acoustics (Huizhou) Ltd. Laboratory
Reverberation Rooms named under Solar System

Supreme NAP's laboratory is inspired and built in accordance with the Law of Universe. There are eight numbers of reverberation rooms of which the name of the planets in our solar system are designated to them on the basis of their room volumes. The silencer test rig is the longest test rig with an elbow tail which is named as 'Galaxy NGC 1672'. Several buildings with over 10 test rooms, named 'Superstars', are constructed for field measurement of sound insulation of windows, curtain walls and façade elements.

With much pleasure, we are pleased to share with you the 'Space' journey.

Mercury & Venus

They are the 2 vertically adjacent reverberation rooms for sound insulation test of floor and ceiling.

Measurement of improvement of impact and airborne sound insulation on heavyweight floor
Floating floors, floor coverings and sound isolated ceilings.

The airborne sound insulation of floor is determined from the noise level difference between the two reverberation rooms, the acoustical and geometric properties of the receiving room.

Common Standards:
> ISO 10140-2
> ASTM E90
> GB/T 19889.3

The impact sound pressure level in the receiving room is measured when the floor under test is excited by the standardized impact sound source. The impact sound insulation of the floor is characterized by the value of the normalized impact sound pressure level.

Common Standards:
> ISO 10140-3, ISO 140-6, ISO 140-8, ISO 16251-1
> GB/T 19889.8

Earth & Mars

They are the 2 adjacent reverberation rooms for flanking transmission of airborne sound insulation test of a suspended ceiling between adjoining rooms.

Measurement of room-to-room airborne sound insulation of a suspended ceiling
Suspended Ceiling systems, integrated system comprising ceiling, other components and plenum, barriers.

The sound insulation performance is characterized by the suspended ceiling normalized level difference: the sound pressure level difference between the two reverberation rooms, the acoustical and geometric properties of the receiving room.

Common Standards:
> ISO 10848-2
> ASTM E1414


This is the largest reverberation room which has room volume of 307 m3. Laboratory measurements for sound absorption, sound power and sound insulation of enclosure can be conducted in this room.

Measurement of Sound absorption & scattering
Ceiling tiles, wall panels, office screens, theatre seats, sound absorbing materials, discrete sound absorbers, and noise barriers.

The sound absorption coefficient is obtained from the difference in absorption in the 'Jupiter' with and without the test specimen, determined from reverberation time measurements.

Common Standards:
> ISO 354, ISO 17497-1, BS EN 1793-1
> ASTM C423
> GB/T 20247

Precision measurement of sound power levels
Machines, equipment, sound generation devices, air-conditioning components and home appliances.

Sound power levels are determined from sound pressure measurements, the acoustical and geometric properties of the room and the physical constant of air.

Common Standards:
> ISO 3741
> GB/T 6881.1

Measurement of Sound insulation performance of enclosures
Machinery enclosures, personnel booths and audiometric booths.

The Noise Reduction is determined from the sound pressure level difference inside and outside the enclosure when situated in a reverberant field. The diffuse noise source can be located in the reverberation room or inside the enclosure being tested.

Common Standards:
> ISO 11546-1, ISO 11957
> ASTM E596
> GB/T 18699-1

Saturn, Uranus, Neptune

They are the 3 adjacent reverberation rooms for airborne sound insulation test.

Measurement of Airborne Sound Insulation
Walls and partitions (drywall or masonry), doors, windows and glazing, building elements, noise barriers and acoustic panels.

The transmission loss or sound insulation of the test object is determined from the noise level difference between the two reverberation rooms, the acoustical and geometric properties of the receiving room.

Common Standards:
> ISO 140-3 (BS 2750-3), ISO 140-10, ISO 10140-2, BS EN 1793-2
> ASTM E90
> GB/T 8485, GB/T 19889.3


It is a silencer test rig in length over 50 m for silencer performance test. The system duct size is 900 mm (W) x 650 mm (H). The system air duct is terminated in the reverberation room 'Jupiter'.

Measurement of silencer insertion loss, flow noise and pressure drop
Insertion loss and airflow generated noise are conducted by diffuse field method. It covers the laboratory testing of duct liner materials, integral ducts and in-ducts absorptive straight and elbow silencers used in the ventilation systems of buildings.

Silencer performance including: Insertion loss without and with air flow, Pressure drop and Sound power level measurements for airflow generated noise.

Common Standards:
> ISO 7235, ISO 11691
> ASTM E477
> GB/T 25516, GB/T 4760


Brilliant acoustic testing facility which is composed of several buildings with over 10 test rooms for field measurement of sound insulation of windows, curtain walls and façade elements.

Difference, in dB, between the outdoor sound pressure level in front of the façade and time averaged sound pressure level in the receiving room can be obtained.

Standardized level difference, in dB, corresponding to a reference value of the reverberation time in the receiving room can be determined to evaluate the sound insulation performance of windows, balconies and other façade elements.

Common Standards:
> ISO 16283-3, ISO 10052, ISO 140-5
> ASTM E966
> GB/T 19889.5

Outside the Universe
Field test services can be provided as below:

Field Test Services:

Airborne Sound Insulation

Common Standards:

  • ISO 140-4, ISO 140-5, ISO 10052, ISO 16283-1, ISO 16283-3
  • ASTM E336
  • GB/T 16730, GB/T 19889.4, GB/T 19889.5, GB/T 19889.10

Field Test Services:

Structure-borne Sound Insulation

Common Standards:

  • ISO 140-7, ISO 10052, ISO 16283-2
  • ASTM E1007
  • GB/T 19889.7

Field Test Services:

Sound Insulation – Enclosures

Common Standards:

  • ISO 11957, ISO 11546-2

Field Test Services:

Insertion Loss of Outdoor Noise Barriers

Common Standards:

  • ISO 10847

Field Test Services:

Sound Absorption & Scattering

Common Standards:

  • ISO 17497-2

Field Test Services:

Reverberation Time

Common Standards:

  • ISO 3382-1, ISO 3382-2

Field Test Services:

Airflow Resistivity Test

Common Standards:

  • ISO 9053
  • DIN EN 29053

Field Test Services:

Sound Power Levels

Common Standards:

  • ISO 3744, ISO 3746, ISO 3747
  • Noise Control Ordinance (Chapter 400) – Noise Control (Air Compressors) Regulations
  • Noise Control Ordinance (Chapter 400) – Noise Control (Hand Held Percussive Breakers) Regulation
  • Quality Powered Mechanical Equipment (QPME) Label(EPD)- European Union(EU) Directive 2000/14/EC
  • Quality Powered Mechanical Equipment (QPME) Label(EPD)- Regulations of Ministry of Land, Infrastructure, Transport and Tourism(MLIT) of Japan

Field Test Services:

Silencer Performance

Common Standards:

  • ISO 11820

Field Test Services:

Sound Pressure Levels

Common Standards:

  • ISO 1996-2, ISO 10052, ISO 16032
  • GBZ/T 189.8, GB 3096, GB/T 3222-1, GB 12348, GB/T 12524, GB/T 18204.1, GB 22337
  • Technical Memorandum for the assessment of noise from places other than domestic premises, public places or construction sites by Hong Kong Environmental Protection Department

Field Test Services:

Loading Test

Common Standards:

  • BS EN 1794-1

More About...


Airflow Resistivity Test

By mounting the test specimen in a measurement apparatus Nor1517A, specific airflow resistance can be determined in a short period of time.
The airflow resistance of porous materials can be used to establish correlations between the structure of these materials and some of their
acoustical properties (for example, absorption, attenuation, etc.).

This laboratory measurement is useful as a quick and economical test in ensuring product quality and for conducting research & product development.

Loading Test

Testing the structural stability of noise barriers and silencer splitters under wind load

The test is to assess the mechanical performance and stability requirements of a noise reducing device or panel.

Testing results include deflection under self weight, deflection under simulated wind load and permanent deflection.