Since 2008
What is Sound Absorption?
In the eighth episode of the “Back to Basics” series, Dennis Foley delves into the concept of sound absorption. He highlights that sound absorption is fundamentally about energy transformation. Through processes like airflow and friction, energy changes occur, leading to the conversion of sound energy into heat. This episode aims to demystify the principles behind sound absorption and its significance in room acoustics.
”Sound absorption transforms energy through airflow and friction, resulting in a change to heat.
Dennis Foley
In Summary
Dennis categorizes sound absorption into two main types: pressure-activated sound absorption and velocity-based absorption. The former deals with energy below 100 Hertz, which is the low-frequency pressure or bass that is commonly felt in small room environments. This pressure leads to distortions like room modes. To address this, one must use pressure-related treatments, such as diaphragmatic absorption.
The latter, velocity-based absorption, deals with energy greater than 100 Hertz. This involves rays or reflections, and common solutions include foam and other sound-absorptive materials. However, it’s crucial to ensure that the rate and level of the material match the voice and music for optimal sound quality.
Key Takeaways
- Sound absorption involves transforming sound energy into heat.
- There are two main types of sound absorption: pressure-activated and velocity-based.
- Low-frequency pressure below 100 Hertz requires pressure-related treatments.
- Energy above 100 Hertz involves rays or reflections, addressed using materials like foam.
- The rate and level of absorption material should match the intended sound usage.