Sienna Rhodes
Bookshelves are commonly used as a soundproofing technique, particularly in recording studios. While they may not be as effective as professional soundproofing methods, bookshelves can provide some level of sound absorption and diffusion. The effectiveness of bookshelves in soundproofing depends on various factors, such as the number of books, their arrangement, and the coverage of the wall surface area. Additionally, combining bookshelves with other materials, such as foam, can enhance their soundproofing capabilities. However, it is important to note that soundproofing and acoustic treatment are distinct concepts, and bookshelves may be more suitable for the latter.
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What You'll Learn
Bookshelves can help with sound absorption and diffusion
While bookshelves may not be the most effective soundproofing method, they can still help with sound absorption and diffusion.
Sound absorption refers to the process of reducing the reflection of sound waves, while diffusion involves scattering sound waves to minimise echoes and create a more pleasant acoustic environment. Bookshelves, particularly those filled with books, can aid in both these processes.
Firstly, bookshelves themselves are often made of wood, which is known for its sound absorption and diffusion qualities. The varying depths created by books of different sizes on a shelf can further enhance this effect, making it similar to using small blocks of wood in diffusers. This can be especially beneficial in small rooms, where sound diffusion is crucial to preventing echoes and creating a more comfortable acoustic space.
Secondly, bookshelves can be strategically placed to help control reflections inside a room. For instance, placing a bookshelf in an alcove or against a wall can reduce the amount of sound entering or leaving the room through that area. This can be further improved by ensuring the bookshelves are firmly fixed to the wall and sit flush against it, with no gaps that sound waves can easily pass through.
Additionally, bookshelves can be modified to enhance their sound absorption and diffusion capabilities. For example, you can staple acoustically transparent material to the backs of the shelves and mount absorbing materials like OC703 behind it. You can also add egg-crate foam to the backs of bookcases, providing extra sound insulation.
While bookshelves may not offer the same level of sound control as dedicated acoustic panels, they can still be a viable and cost-effective solution, especially when combined with other sound-absorbing materials. They allow for customisation and provide the dual benefit of storing books while also improving the room's acoustics.
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Bookshelves are not diffusors
Bookshelves are not diffusers. While bookshelves can be used to improve the sound in home production spaces, they are not diffusers. Diffusers are specifically designed for diffusing sound, and bookshelves do not scatter and diffuse sound over a large frequency range.
The key difference between bookshelves and diffusers is that diffusers scatter reflections evenly in all directions for their effective plane(s), whereas bookshelves do not. Bookshelves are not broadband scattering devices that evenly disperse energy across a given hemisphere, regardless of the angle of incidence.
Additionally, depth is important in diffusion, and while some diffusers like skylines have varied depths, bookshelves do not. Bookshelves with different-sized books may help with diffusion, but they are not a substitute for a professionally made acoustic diffuser.
Bookshelves can, however, be used to control reflections inside a room and may offer minimal help with reducing some high and midrange frequencies from passing through. For example, a user on Mumsnet noticed that after moving an IKEA shelving unit out of their living room, they could hear their neighbours more. This suggests that the bookshelf was providing some level of sound insulation.
Therefore, while bookshelves may have some sound insulation properties, they are not diffusers and should not be relied upon as a primary means of sound diffusion.
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Bookshelves can be used as a cost-effective soundproofing alternative
While soundproofing a room is an expensive affair, bookshelves can be used as a cost-effective soundproofing alternative. Bookshelves full of books can act as a diffuser to reduce room reflections and echo, thereby improving the acoustics of the room. However, it is important to note that a bookshelf will not offer much soundproofing in terms of blocking out external noise.
To use bookshelves for sound insulation, they must be firmly fixed to the wall, with no gaps between the shelf and the wall. For instance, IKEA Billy bookcases can be fixed to the wall by cutting out a bit of the bottom back in the shape of the skirting board so that it sits flush with the wall. Additionally, egg-crate foam can be fixed to the back of each bookcase for extra sound insulation.
Bookshelves with varying heights of books can also be used as diffusers, similar to small blocks of wood in professionally made acoustic diffusers. However, the effectiveness of bookshelves as diffusers is limited, and they are not a substitute for proper acoustic treatment.
For those looking for a DIY option or wanting to improve the acoustics of their room without spending a lot of money, bookshelves can be a good alternative. They can be designed to one's liking and can store books while also providing some sound absorption and diffusion benefits.
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Soundproofing is different from acoustic treatment
Soundproofing and acoustic treatment are two different applications for two very different problems. Soundproofing refers to blocking noise from entering or leaving a room. This is achieved through construction methods such as building additional walls, allowing for air gaps, and providing insulation. The mass of the construction materials is the key factor in blocking sound.
On the other hand, acoustic treatment focuses on improving the sound quality within a space. This is achieved by adding sound absorption materials such as cellulose, mass-loaded vinyl, and melamine foam. Acoustic treatment aims to reduce reverberation, echoes, and standing waves, creating a more pleasant listening experience.
While bookshelves full of books can help with sound diffusion and reflection control, their impact on soundproofing is minimal. They might offer some help in reducing high and midrange frequencies, but they will not effectively block low frequencies.
To effectively soundproof a room, construction methods that add mass are required. Acoustic treatment, on the other hand, involves the strategic placement of sound-absorbing materials to improve sound quality and reduce unwanted reflections.
In summary, soundproofing aims to block sound transmission, while acoustic treatment enhances sound quality within a space by absorbing or diffusing sound waves. Bookshelves may have a minor impact on sound diffusion but are not a reliable soundproofing solution.
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Bookshelves can be used in conjunction with soundproofing materials
While bookshelves alone may not be the best option for soundproofing, they can be used in conjunction with soundproofing materials to help reduce noise.
Bookshelves, particularly when filled with books, can provide some sound absorption and diffusion. This means they can help to reduce echoes and reflections within a room, creating a non-reflective surface. However, the sound diffusion qualities of bookshelves can be uneven, with high absorption at one frequency and none at a very close frequency, which can make the frequency response worse than without the bookshelf.
To enhance the soundproofing capabilities of bookshelves, consider the following:
- Place the bookshelf on the rear wall of the room. A wall of bookshelves can act as an effective 'anti-reflection' strategy, helping to scatter and absorb frequencies.
- Ensure the bookshelves are firmly fixed to the wall, with no gaps between the shelves and the wall. This will help to prevent sound from travelling through any spaces.
- Use bookshelves with solid backs that can be placed flush against the wall. If your bookshelf doesn't have a back, consider fixing a sheet of foam, such as egg-crate foam, to the back of the bookshelf before pushing it against the wall.
- Fill the bookshelves with books of varying sizes. The varying depths and sizes of the books can help to diffuse and absorb sound, similar to the effect of small blocks of wood in diffusers.
- Combine bookshelves with other soundproofing materials. For example, mineral wool or rigid fibreglass can be used in conjunction with bookshelves to improve overall sound insulation.
By following these suggestions, bookshelves can be used effectively in conjunction with soundproofing materials to help reduce noise and improve acoustics within a space.
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Frequently asked questions
Bookshelves, particularly those filled with books, can provide some sound absorption and diffusion, reducing echo and reflections in a room. However, they are not as effective as dedicated soundproofing methods or acoustic panels. For meaningful soundproofing, it is recommended to build extra walls or floors, or use sound-insulating materials.
Sound absorption refers to the reduction of sound reflections and echoes within a space, making it "pleasanter for the ears". Sound diffusion involves scattering sound waves to create the perception of a larger space.
To enhance the sound absorption and diffusion of your bookshelf, consider the following:
- Ensure the bookshelf covers a large percentage of the wall surface area.
- Use bookshelves with solid wood backs, which are better for sound absorption than open shelves.
- Fill the bookshelf with books of different sizes and materials, creating an irregular surface that improves diffusion.
- Securely attach the bookshelf to the wall, reducing any gaps that sound can leak through.
- Combine the bookshelf with other sound-absorbing materials, such as acoustic panels or foam.
