Absorption coefficient
Absorption coefficient – explained simply
Theabsorption coefficient (α) describes how well a material can absorb sound. It is a key value in acoustics and helps to assess how effectively a product reduces disturbing noise. The value is always between 0 and 1:
• 0 = no absorption (all sound is reflected)
• 1 = complete absorption (the sound is completely absorbed)
The higher the absorption coefficient, the less reverberation there is – and that is exactly what creates pleasant, quiet room acoustics. This is particularly important in rooms such as living rooms, home offices, music rooms or children's rooms, where good sound quality contributes significantly to the quality of living.
What happens to sound when it hits a surface?
When sound waves hit a material, there are three possibilities:
1. Reflection – the sound bounces off and remains disruptive in the room.
2. Absorption – some of the energy is converted into heat; the room seems quieter.
3. Transmission – the sound penetrates (e.g. through thin walls).
High-quality sound absorbers reduce reflection, thereby improving both the sound and the sense of well-being.
Why is absorption coefficient important?
A high absorption coefficient means:
✔ less reverberation
✔ better speech intelligibility
✔ more pleasant sound in the room
✔ effective reduction of everyday noise sources
This plays a major role in private rooms – whether for relaxed evenings watching television, concentrated work or undisturbed conversations.
What does the absorption coefficient depend on?
Several factors influence the α value:
• Type of material (e.g. foam, textile, wood)
• Structure & porosity
• Material thickness
• Mounting distance from the wall
• Frequency of the sound (low, medium or high tones)
Particularly porous materials such as acoustic foams achieve very good values at medium to high frequencies – ideal for typical living room situations.
How does soniflex help improve absorption levels?
Our acoustic products are designed to effectively absorb sound while being easy to install – perfect for private applications such as:
• Living rooms & home cinemas
• Home offices & studies
• Rehearsal rooms & hobby rooms
• Bedrooms to reduce room echo
• Children's rooms to reduce noise
Depending on the product, our acoustic panels achieve a high degree of absorption, significantly improving the acoustics in your home – without the need for structural measures.
In short
The absorption coefficient shows how well a material ‘absorbs’ sound. A high value significantly improves room acoustics, resulting in more peace and quiet and greater well-being in everyday life. If you want a quieter, more pleasant-sounding room, acoustic panels or absorbers with a high absorption coefficient will help you achieve this goal with ease.