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Bell

Product catalog summary

Introduction to Acoustic Performance
Noise is defined as an unwanted and disturbing sound, such as the buzzing from a moving car or a drill. Acoustic comfort refers to the psychophysical wellbeing experienced in an environment where noise is limited. The Reverberation Time (RT60) is a key measure of acoustic comfort, indicating the time required for sound to become imperceptible. High RT60 values suggest a noisy environment, often due to reflective materials or irregular geometric shapes.

Measuring Acoustic Efficiency
The efficiency of sound-absorbing objects is determined by measuring the RT60 of an environment with and without these objects. The formula used is RT60 = 0.161 x (V/A), where V is the volume of the space and A is the cumulative Equivalent Sound Absorbing Area of all surfaces and objects. The Sound Absorption Coefficient (α) of a material ranges from 0 (all sound reflected) to 1 (all sound absorbed).

Sound-Absorbing Objects
Introducing sound-absorbing objects, such as lamps, can reduce RT60 and enhance acoustic comfort without structural changes. The Equivalent Sound Absorbing Area (A) of an object considers its material properties, size, and shape.

Testing and Results
Tests were conducted in a room measuring 8m x 6m x 3.1m (150 m³). The RT60 was measured across various frequencies, both with and without acoustic lamps. Results showed significant reductions in RT60 with the addition of 1, 2, or 3 lamps, demonstrating the effectiveness of these lamps in reducing noise levels.

Data Summary
For different lamp models, the reduction in RT60 and the Equivalent Sound Absorption Area (A) were recorded across frequencies from 125 Hz to 8000 Hz. The data indicated varying levels of noise reduction, with some models achieving up to 59.7% reduction in RT60 with three lamps.

Catalog excerpts

Acoustic performance Bell

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From noise to acoustic comfort, how to do it? Noise is commonly identified as an unwanted and disturbing sound, for example buzzing (an incomprehensible and continuous hum) from a moving car, a drill, etc. Acoustic comfort is the psychophysical condition of wellbeing a person finds themselves in when they are in an environment where noise is limited. The measurement of Reverberation Time (RT60), or the time required for sound to become imperceptible, allows the acoustic comfort to be measured in any given environment: the higher the reverberation time, the greater the perception of sound. A setting...

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Where we tested our products? Manuel Vivian from 0,32 to 4,63 Equivalent Sound Absorbing Area (A) The environment used to measure the sound-absorbing properties the Axolight lamps is shown below: This is how the reduction of sound in the room was calculated. Acoustic performance The Reverberation Times of the room, with sounds of varying frequencies emitted from an audio source, were measured, first without acoustic lamps, then with 1, 2 or 3 lamps added at a time.

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Lighting performance per lamp Acoustic performance Before Initial Reverberation Time (RT60) in s After Reduction of Reverberation Time (RT60) in % Equivalent Sound Absorption Area (A) in m2 per lamp FREQUENCY Studio Polio

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Lighting performance per lamp Lighting performance per lamp Acoustic performance Acoustic performance Initial Reverberation Time (RT60) in s Initial Reverberation Time (RT60) in s After Reduction of Reverberation Time (RT60) in % Reduction of Reverberation Time (RT60) in % Equivalent Sound Absorption Area (A) in m2 per lamp Equivalent Sound Absorption Area (A) in m2 per lamp FREQUENCY Acoustic performance

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