What is NIC (Noise Isolation Class) and how it is used in testing acoustic booths and soundproof booths

What is NIC (Noise Isolation Class) and how it is used in testing acoustic booths and soundproof booths

Noise Isolation Class (NIC) is a laboratory measurement used to evaluate the ability of enclosed booths and rooms to isolate sound. NIC is used primarily in the field of acoustics to test sound-insulating elements such as acoustic booths and soundproofing booths. This test helps determine how well a given product prevents the transmission of noise from one space to another.

How NIC measurement is carried out

NIC measurement takes place in a laboratory environment, where the booth under test is placed in a room whose properties are well known and precisely measured. Sound sources are placed inside the booth, and it is then measured how much of the noise is transmitted from inside the booth out into the room, and vice versa. The result is a value that represents the degree of sound isolation provided by the booth.

NIC measurement tests require specialised equipment, including noise sources, sound level meters and sophisticated data analysis software. The data obtained are then used to calculate an index that indicates the quality of the sound insulation.

The ASTM E413 standard

The ASTM E413 standard is often used to evaluate NIC results, providing a methodology for calculating the STC (Sound Transmission Class) value. STC is a standardised way of classifying the sound insulation of materials, and this standard is commonly applied when testing products used in the construction and acoustics industries.

While STC is used primarily to describe the transmission of structural noise through the walls, floors and ceilings of buildings, NIC provides more detailed information on how specific acoustic products – such as acoustic booths or soundproofing booths – reduce noise transmission through the air rather than through the structure.

Using NIC for acoustic booths and soundproof booths

For acoustic booths and soundproofing booths, NIC measurement is essential. These booths are designed to provide an environment with a high level of sound insulation, eliminating the transmission of noise from outside into the booth and from the booth outwards. Manufacturers use NIC tests to demonstrate how effective their booths are at reducing noise.

Booths intended for professional use – for example recording, podcasting, practising musical instruments or industrial applications – should achieve high NIC values. This ensures that noise from the outside environment will not disturb the work inside the booth and, conversely, that sounds produced inside the booth will not be transmitted outside.

Summary

NIC (Noise Isolation Class) is an important laboratory test used to assess the ability of acoustic booths and soundproofing booths to isolate noise.

NIC values make it easy to compare similar products from different manufacturers, thereby increasing the transparency of the products on offer. They will help you make a better-informed decision and choose a product you will be truly happy with.