Hearing protection for intensive use – why a higher SNR isn’t always better

In noisy environments, where workers are exposed to constant noise for long periods, hearing protection is a crucial part of health and safety. Yet there is a great deal of misunderstanding about exactly what constitutes ‘good’ hearing protection. One of the most persistent assumptions is: the higher the SNR, the better the protection. In this article, we explain why this is not always the case, what the SNR value actually indicates, and why the best solution depends on several factors.

What exactly is SNR?

SNR stands for Single Number Rating and indicates, in a single figure, how much noise (in decibels) a hearing protector attenuates on average. An earplug with an SNR of 30 dB theoretically reduces ambient noise by 30 decibels.

That sounds simple, but in practice it is slightly more complex. Sound consists of different frequencies (low, mid and high tones), and hearing protection does not attenuate them all equally. The SNR is therefore an average value – not an exact prediction of what someone actually experiences.

Why a higher SNR isn’t always better

1. Over-protection can be unsafe.

Although it might seem logical to always opt for maximum attenuation, an SNR that is too high can actually pose risks. When ambient noise is attenuated too much, important signals can be lost, such as:

• Warning signals
• Approaching traffic or machinery
• Communication from colleagues

This can lead to dangerous situations in the workplace. Good hearing protection not only protects your hearing, but also keeps you connected to your surroundings.

2. Reduced speech intelligibility

One of the most underestimated drawbacks of a high SNR is that speech becomes less intelligible. This is particularly problematic in dynamic work environments where communication is essential. Employees then often:

• Speak louder (putting more strain on their voice),
• Temporarily remove their hearing protection,
• Or misinterpret signals

And that is precisely what increases the risk of hearing damage and errors.

3. ‘Optimal attenuation’ depends on the situation

The aim of hearing protection is not to completely block out the sound, but to reduce it to a safe level – ideally between 70 and 80 dB at the ear. An example:

• Ambient noise: 95 dB
• Earplugs with SNR 30 = effective level around 65 dB (too quiet)
• Earplugs with SNR 20 = effective level around 75 dB (ideal)

Too much cushioning can lead to a lack of awareness and reduced alertness. That is why it is important to tailor protective equipment to the specific working environment.

Why standard earplugs don’t always work in every situation

Standard earplugs offer a general solution, but do not take into account:

• Individual ear shape
• Specific noise profiles
• Working conditions (e.g. the need to communicate)

As a result, the effective attenuation is often lower than the SNR indicates (due to a poor fit) or, conversely, less effective (due to incorrect attenuation characteristics)

Prolonged exposure and auditory fatigue

With intensive use, it is not only protection that matters, but also comfort and sound perception. Excessive attenuation can lead to:

• Fatigue due to isolation
• Reduced concentration
• An increased tendency to remove the protection

In addition, an unnatural sound balance (in cheap earplugs) can place extra strain on hearing, as certain frequencies are disproportionately amplified or, conversely, attenuated.

Role of ergonomics and fit

A good fit is essential for effective protection. Even an earplug with a high SNR performs poorly if it does not seal properly. Important factors are:

• Material (soft, dimensionally stable)
• Shape (universal vs. custom-made)
• Correct insertion of the earplugs
• Comfort during prolonged wear

Custom-made hearing protection often offers advantages, as it provides a consistent and reliable seal and remains comfortable during prolonged use.

Working in dynamic environments

In environments where noise levels are constantly changing – such as construction sites, events or production floors – flexibility is crucial. It is important that hearing protection:

• Adapts to varying noise levels
• Allows speech and signals to be heard where necessary
• Does not need to be constantly adjusted or removed

In such situations, solutions with flat attenuation (filters that attenuate all frequencies equally) or active hearing protection are often more effective than simply a higher SNR.

Need help?

A higher SNR does not automatically mean better hearing protection. On the contrary: too much attenuation can lead to isolation, reduced safety and poorer communication. The right choice depends on:

• The noise level
• The nature of the work
• The need for communication
• And long-term wearing comfort

Effective hearing protection is all about balance – not maximum attenuation.

Looking for the right hearing protection for your working environment? We’d be happy to help you find the right solution. Contact us today on T. +31 (0)181 47 50 00 and discover what suits your situation best.