The_easy_way_to_good_acoustics_ENG - Flipbook - Page 5
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The Optimal Reverberation Time
The optimal reverberation time depends on how the room is used. For example, in classrooms, it’s crucial that both the students in the front and the back can clearly hear the teacher without disruptive noise.
To achieve the right acoustic environment, it’s important to place sound-absorbing elements strategically within the space.
Place materials where sound hits first
Sound travels in all directions and reflects off the surfaces it encounters. To reduce reverberation time effectively, the sound
must be absorbed where it hits first.
Consider the source of the sound
In most cases, sound-absorbing materials should be placed as close to the source as possible. That is, where the sound first
hits. However, the ideal placement depends on the function of the room.
For instance, the acoustic requirements of an office, where sound can originate from many locations, differ greatly from those
of a concert hall, where sound typically comes from a single source.
In offices, it makes sense to distribute the acoustic elements throughout the room to optimise and tailor the sound environment. In contrast, a concert hall demands a more targeted approach: sound should be allowed to “travel” through the space
so even the furthest listeners receive the full acoustic experience. In such cases, placing acoustic elements primarily on the
end walls ensures that sound is absorbed only after it has fulfilled its intended purpose.
Use the ceiling
The ceiling is a large surface and is often close to the sound source, making it an ideal location for installing sound-absorbing
materials. However, installing a new acoustic ceiling is often a significant investment.
Use the walls
As an alternative to the ceiling, the walls can be used effectively.
A general rule of thumb is to cover approximately 20% of the floor area with sound-absorbing material placed on two adjacent
walls - unless the room’s function dictates otherwise.
This is because walls are often close to the sound source, such as people speaking.
Moreover, wall-mounted acoustic solutions are usually more cost-effective and considerably easier to install than a completely
new acoustic ceiling.
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