Sound Absorption: Choosing the Right Material for Each Room

In short:

Noise at night turns the living room into a small, echoey space and makes video calls impossible to understand; urgent measures are needed to reduce the noise and protect the family’s sleep.
Technical approach: Measure the volume and RT60, apply αw to calculate the required absorption area, and select materials.
Strategic placement prioritizes key listening areas, combining panels, acoustic foam, and bass traps to effectively cover both low and high frequencies without compromising aesthetics.

In the evening, a neighbor bangs on the door and wakes up the whole house. This echo effect turns the living room into a small, reverberant space. Tensions rise when the video conference becomes impossible to follow. You might think that simply laying down some carpet will be enough to improve the acoustics. To effectively improvesound absorption, some solutions involve, for example, soundproofing an apartment with soundproof curtains, which can dampen reverberations and limit the spread of noise. A simplified technical guide helps you choose the right sound absorber for each frequency.

A Practical Guide to Choosing the Right Sound-Absorbing Material for Every Room in Your Home

This plan outlines the technical principles and effective materials for each space. The general recommendations combine definitions, technical guidelines, and real-world examples.

The guide sets out clear objectives: reducing reverberation and controlling early reflections. A simple point of reference is the distinction between absorption and insulation, and the use of acoustic curtains on certain facades. You will learn how to measure and calculate the absorption area required for a typical room. This approach is based on a material’s ability to capturesound energy and reduce reflections withina room’s acoustics. We also provide practical guidelines for the placement and density of panels, prioritizing absorbent materials suited to the room’s layout.

Acoustic comfort makes all the difference.

The role of the NRC absorption coefficient αw and guidelines for interpreting measured values

The αw coefficient and the NRC evaluate soundabsorption across different frequency bands. The sound absorption coefficient αw is a standardized index used to measure the performance of an acoustic product. An αw value summarizes a material’s absorption curve. You then calculate the equivalent area by multiplying αw by the material’s surface area: this absorption calculation provides an estimate of the overall effectiveness of the treatment. Here is a numerical example for a home studio to illustrate this.

The simplified calculation starts with the volume and a target RT60. The target reverberation time is 0.4 seconds. You then apply αw coefficients to convert A into the square meters of panels required. In practice, for a 20 m³ amateur studio with an RT60 of 0.4 seconds, approximately 8 m² of effective absorption is needed.

Calculations make choices clear.

A comparison of foam, wool, panel, sheer, and curtain materials by frequency band

This comparison helps you choose based on the target frequency range. Not all sound-absorbing materials perform the same across the entire sound spectrum. Acoustic foam effectively absorbs high frequencies, particularly in lightweight acoustic panels used for interior treatment. For low frequencies, prioritize rock wool or hemp wool, as these porous materials offer better performance at lower frequencies. Raw wood can also serve as a complementary diffusion surface. Combined materials are often chosen to achieve broad frequency coverage.

Material	approximate αw	Effective bands	Main advantage	Main limitation
Melamine foam	0.40 to 0.80	Midrange and high frequencies: 500 to 4,000 Hz	Easy and cost-effective installation	Poor bass response without significant depth
Rock wool or glass wool	0.60 to 0.95	Wide frequency range: 250 to 4000 Hz	High-performance and cost-effective	Requires covering and protection
Recycled fiber panel	0.50 to 0.90	500 to 4,000 Hz, depending on density	Stylish and eco-friendly	Varies depending on density and thickness
Soundproof curtain	0.30 to 0.75	400 to 2,000 Hz	Dual acoustic and thermal function	Performance depends on installation and coverage
Acoustic veiling	0.15 to 0.40	High frequencies: 1,000 to 4,000 Hz	Allows light to enter while providing subtle dimming	Not very effective at low frequencies

The acoustic panel reduces reverberation.

The guidelines recommend combining materials to cover both low and high frequencies. Priority should be given to placing materials in primary reflection zones for maximum impact. You will also notice that increasing the thickness enhances absorption at lower frequencies. It is important to note that the ceiling and the opposite wall require special attention.

The following summary outlines immediate actions.

Placement based on initial judgment prioritizes impact.
A minimum thickness of 50 mm for the middle layers.
You install bass trap panels to reduce low frequencies.
Acoustic sheers are used to let light in.
Thick curtains provide insulation and sound absorption.

The Nokomis service Nokomis choose sheer curtains and acoustic accessories that are right for your project

The service offers personalized guidance to help you choose soundproof curtains, sheer curtains, and accessories. The assessment is based on simple measurements such as the room’s volume, the desired RT60, and reflective surfaces. This approach allows us to determine the appropriate acoustic treatment and optimize noise reduction in the space. You’ll receive a quick simulation, an online quote, and installation assistance, with the option to incorporate absorption panels to improvethe room’sacoustic environment.

The typical customer is between 30 and 50 years old and often works from home. An appreciation for design and sustainability leads them to choose French products and recycled materials. You expect clear service, a quick quote, and assistance with installation.

Product	Acoustic performance	Recommended use	Competitive advantage
30 dB noise-reducing curtain	Very high in the midrange	Noisy facades and bedrooms	Acoustic and thermal insulation
Acoustic curtains	Moderate to high	Lobbies, offices, reception areas	Style and Performance
Acoustic veiling	Low to moderate	Places requiring lighting and dimming	Luminous transparency
Accessories and rods	Impact on performance if adjusted	Installation Optimization	Compatibility Guaranteed

Made in France is a guarantee of quality.

The service offers free estimates and priority consultation to help you optimize placement and quantity. Special attention is given to recycled materials and aesthetic finishes. You’ll receive technical support to ensure a clean and sustainable installation.

Making silence measurable changes how a room is used. Your next measurement can be quick and easy. One simple question remains: what RT60 target are you aiming for? This consideration requires understanding the difference between sound absorption and sound insulation. The former acts within the room by limiting the reverberation of a sound wave, while the latter aims to prevent sound from passing through a wall. Depending on the need, both approaches contribute to noise reduction and improvedacoustic comfort.

Frequently Asked Questions About Sound Absorption

What is sound absorption?

Sound absorption, to put it simply, is the humble art of silencing the echoes that make a room hum. I remember a living room where every word echoed, to the point where even the soup seemed to be talking to itself. Sound absorption involves reducing sound waves by eliminating or dampening their reflection off surfaces, using materials or structures that absorb the energy. You install panels, foam, thick curtains, or imagine well-stocked bookshelves. A comfortable, not magical, mission—tried and tested between cups of coffee, with experiments that sometimes fail and often succeed. A small victory.

What is sound absorption?

Sound absorption, simply put, is a measure of the amount of energy removed from a sound wave as it passes through a material. I tested this with some foam scraps in a corner of the workshop, and the difference was clear: less resonance, less noise. Absorption depends on thickness, density, and sound frequency. Some materials absorb high frequencies, others low frequencies. It’s not a magic formula, but rather a process of trial and error, adjustments, and often a little DIY hack that ultimately makes a room more pleasant to the ear and creates a better atmosphere.

Which material absorbs sound?

Which material absorbs sound? Whether in a workshop or a living room, sound-absorbing materials often make all the difference. Rock wool and glass wool remain classic choices—effective and affordable. Melamine acoustic foam absorbs high-frequency sounds, recycled fiber panels offer a greener solution, sheep’s wool provides warmth and sound absorption, and hemp surprises with its balance. A newcomer, mycelium intrigues and is tested out of curiosity. You can also fill bookshelves, hang heavy curtains, or make homemade panels—tested and approved after a few trials (and a few expletives) and a lot of patience.

What is the difference between sound insulation and sound absorption?

What is the difference between sound insulation and sound absorption? Simply put, insulation is designed to block outside noise and prevent it from entering, while absorption focuses on controlling the propagation of sound within a room. I built a heavy partition for the garage; it insulated well, but the room still echoed, which is why I added sound-absorbing panels. You achieve greater quiet by combining mass, sealing, and absorbers. A tip from a neighbor: a thick rug and a bookshelf work wonders—they’re inexpensive, tried and tested, and perfect for a quick DIY project over a beer after a well-deserved day’s work.