Elliot Kim
Hearing protectors, such as earplugs, are wearable devices that can lower the intensity of sound that enters your ears and protect your hearing. While they are essential in loud settings, such as concerts or sporting events, they can also amplify certain sounds, like your own breathing or heartbeat, due to the vibrations bouncing off the earplugs and back to the eardrum. This phenomenon is known as the occlusion effect. The effectiveness of earplugs in reducing sound is indicated by their Noise Reduction Rating (NRR), with higher NRR values corresponding to greater noise dampening. However, it's important to remember that even the highest-rated earplugs will not work if they are not worn correctly and inserted deeply into the ear canal. Additionally, overreliance on earplugs can lead to increased sensitivity to sounds and should be used cautiously for managing sound sensitivities and conditions like misophonia and tinnitus.
| Characteristics | Values |
|---|---|
| Purpose of earplugs | To lower the intensity of sound that enters your ears and protect your hearing |
| Hearing protection usage | Avoid exposure to loud sounds, move away from the noise, or turn down the volume |
| Safe sound level | At or below 70 A-weighted decibels (dBA) |
| Unsafe sound level | Sounds at or above 85 dBA can cause hearing loss |
| Hearing protection devices | Earplugs, protective earmuffs, canal caps |
| Earplug types | Formable foam earplugs, pre-molded plastic/rubber/silicone earplugs, high-fidelity (hi-fi) earplugs, musician earplugs |
| Noise Reduction Rating (NRR) | A numerical value indicating how effectively earplugs reduce sound; a higher NRR means greater noise dampening |
| Proper fit | Rolling foam earplugs into a tight cylinder and inserting them deeply into the ear canal is necessary for best results |
| Sound sensitivity considerations | Overuse of earplugs can increase sound sensitivity and make sounds appear more intense when earplugs are removed |
| Alternative solutions | Ventilated earplugs, custom-made plugs that fit deeper into the ear canal, electronic devices that cancel out low-frequency sound |
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What You'll Learn
The occlusion effect
To address the occlusion effect, researchers have developed various solutions. One approach is to create ventilated earplugs that allow some air to pass through, reducing the buildup of pressure. Another method involves custom-made plugs that fit deeper into the ear canal to minimize the occlusion effect. Active electronic devices have also been designed to cancel out low-frequency sound waves, reducing the impact of the occlusion effect. A novel solution, known as the "meta-earplug," utilizes 3D-printed interconnected cavities filled with energy-absorbing foam attached to a standard earbud-style insert. This design traps and dampens low-frequency sound waves, reducing the occlusion effect by about 10 dB compared to traditional foam and silicone earplugs.
It is worth noting that while the occlusion effect can be a nuisance, it may have benefits for music enthusiasts. Since low-frequency sounds are trapped during occlusion, the sound quality of instruments with low frequencies, such as drums or bass, can be enhanced.
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Hearing protectors and safety
Hearing protectors, such as earplugs and protective earmuffs, are essential safety gear when it comes to safeguarding your hearing. Loud sounds can damage the sensitive structures in your inner ear, leading to noise-induced hearing loss (NIHL) and tinnitus, characterised by ringing, roaring, or buzzing in the ears. According to the CDC, about one in seven US teens and nearly one in four US adults may have signs of NIHL.
Hearing protectors work by lowering the intensity of sound that enters your ears. They are particularly recommended in loud settings or activities such as auto races, sporting events, fireworks displays, concerts, and riding motorcycles or snowmobiles.
When choosing hearing protection, it's important to select a type that is comfortable and easy to use, ensuring consistent and correct usage. Different types of hearing protectors include formable foam earplugs, pre-molded plastic, rubber, or silicone earplugs, canal caps, safety earmuffs, and even custom-made "musician earplugs" that aim to protect hearing while allowing natural sound to enter the ear. Most hearing protectors have a Noise Reduction Rating (NRR) that indicates their effectiveness in reducing sound; a higher NRR generally means greater noise dampening.
It's worth noting that hearing protectors should not be worn continuously or in all situations. Overuse of hearing protectors can lead to increased sound sensitivity, as the brain adjusts and becomes more sensitive to soft sounds when starved of auditory input. Additionally, removing hearing protection in a loud environment after having them on for a while can put your hearing at risk. Therefore, it is crucial to use hearing protection selectively and only when necessary.
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Noise reduction ratings
Hearing protectors, including earplugs, are classified by their potential to reduce noise in decibels (dB). The higher the Noise Reduction Rating (NRR) number associated with a hearing protector, the greater its potential for noise reduction. For example, 3M™ E-A-R™ Classic Earplugs (NRR 29) used in combination with 3M™ Peltor™ H7 Deluxe Earmuffs (NRR 27) would provide a Noise Reduction Rating of approximately 34 decibels. The NRR is also dependent on the proper usage and fit of the hearing protector.
The American National Standards Institute (ANSI) must test and approve hearing protectors in accordance with the Occupational Safety & Health Administration (OSHA). OSHA requires hearing protection for all employees exposed to noise levels of 85 dB or higher over an 8-hour period. However, the OSHA Action Level varies depending on the surrounding environment's decibel level.
It is important to note that the NRR rating does not directly correspond to the reduction in surrounding decibel levels. For instance, if you are in an environment with a noise level of 100 dB and wear earplugs with an NRR of 33 dB, your level of exposure will not be reduced to 67 dB. Instead, the NRR rating provides a general indication of the potential noise reduction achievable.
Various earplugs are available in the market, such as the Eargasm and Vibes earplugs, which are recommended by audio engineers and sound designers. Custom-made earplugs by audiologists are also an option for those seeking maximum noise reduction. Macks 33 dB foam earplugs, when combined with an over-ear protector, can provide up to 35-36 dB of noise reduction, making them a popular choice for individuals who shoot guns, as this activity can easily exceed 150 dB.
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Custom-made earplugs
One prominent brand in this space is Decibullz, which offers custom-molded earplugs that excel in sports shooting due to their secure and comfortable fit. The THERMO-FIT earpiece moulds perfectly to your ears, ensuring optimal noise protection without distractions. Decibullz earplugs are also widely used by police, fire, EMS, security personnel, and outdoor enthusiasts, providing clear and reliable communication.
EarPeace is another brand that offers custom-molded earplugs with industry-leading acoustic filters for clear sound at a safe volume. Their PRO-26 earplugs are designed for extremely loud environments, providing protection for sound levels up to 110dB. The PRO-Impulse filter is developed for military use, protecting against high-level impulse sounds from gunfire, machinery, and more.
Full Shell Solid Custom Earplugs are designed for those seeking maximum isolation. These deep-fitting plugs are made from soft medical-grade silicone, ensuring a comfortable fit and an effective seal against environmental noise. They offer up to 37 dB of noise reduction and are ideal for industrial settings, including airport runways and construction sites.
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Sound sensitivity and earplugs
Earplugs are a common solution for protecting one's hearing from loud noises. They are wearable devices that can lower the intensity of sound that enters the ears, thus preventing hearing damage. However, their use in individuals with sound sensitivity is a subject of debate.
Sound sensitivity, or misophonia, is a neurophysiological disorder characterised by an aversive reaction to otherwise normal sounds and visual stimuli. Individuals with this condition may find that certain sounds, including soft sounds, trigger an intense emotional or physiological response. While earplugs may seem like a logical solution to block out these triggers, their use in individuals with sound sensitivity is cautioned against by some experts.
The argument against the use of earplugs in sound sensitivity revolves around the concept of auditory deprivation. By blocking out sound, earplugs deprive the brain of necessary auditory stimulation. This can lead to increased sensitivity, as the brain adjusts and becomes more sensitive to soft sounds. As a result, when the earplugs are removed, sounds may appear more intense, exacerbating the individual's sound sensitivity.
Furthermore, the overuse of earplugs can encourage hyperacusis, or increased sensitivity to sound. This is particularly relevant for individuals with tinnitus, as the auditory deprivation caused by earplugs can worsen their condition. Custom-made plugs, often recommended for individuals with sound sensitivity, may not be the best solution as they contribute to continued auditory deprivation and increased sound sensitivity.
However, it is important to note that some alternative products, such as Flare Audio's Calmer, aim to address this issue by removing stressful frequencies while still allowing other sounds to enter the ear canal. This type of product may be a more suitable option for individuals with sound sensitivity, as it provides stimulation to the brain while also offering protection from triggering frequencies.
In conclusion, while earplugs are effective tools for hearing protection, their use in individuals with sound sensitivity should be approached with caution. Alternative solutions that reduce the intensity of sound without completely blocking it may be more beneficial for this population, helping to stimulate the brain while also providing protection from triggering frequencies.
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Frequently asked questions
The best earplugs to block out sound are formable foam earplugs, pre-molded earplugs, canal caps, and safety earmuffs. Musician earplugs are custom-made to protect hearing while allowing as much natural sound as possible.
The best earplugs for you will depend on your comfort and ease of use. The Noise Reduction Rating (NRR) on the packaging indicates how effective the earplugs are at reducing sound. A higher NRR generally means greater noise dampening.
Yes, you can still hear things with earplugs in, but the sound intensity is decreased. Your brain will adjust to the reduced volume, so be cautious of removing earplugs in a loud environment as your hearing will be at risk.
