Essay 1 - Why low-frequency sound is so hard to understand
- Art of Hearing | Dyon Scheijen
- 4 days ago
- 3 min read
LFG Handbook
Essay 1
Why low-frequency sound is so difficult to understand
For many professionals, research into sound begins with measurement. Sound is described in terms of frequencies, intensities, and spectra. These measurements form the basis of acoustic research and have taught us much about the physical properties of sound.
This approach works well for many sound sources. When a machine is running, a ventilation system produces noise, or traffic drives past a home, measurements can often clearly show what is physically present.
With low-frequency sound, however, the situation often proves to be more complex.
Professionals working with reports of low-frequency noise recognize a situation that seems paradoxical at first glance. Residents experience a hum, thud, or vibration in their homes, sometimes especially at night or in quiet rooms. The sound can lead to sleep problems, tension, and insecurity.
When measurements are subsequently carried out, a complex picture frequently emerges. Sometimes low frequencies are measured that match residents' experience. But just as often, measurements show only limited levels, or it proves difficult to identify a clear source.
This difference between experience and measurement can be confusing for all involved.
Residents may feel that their experience is not being taken seriously when measurements do not provide a clear explanation. At the same time, professionals try to remain carefully within the boundaries of what can be technically and scientifically established.
It is precisely in this tension between experience and measurement that an important characteristic of low-frequency sound lies.
The special properties of low frequencies
A first explanation lies in the physical properties of low frequencies themselves.
Low frequencies behave differently from higher frequencies. They can propagate over greater distances, are less attenuated by walls and structures, and can cause complex resonance patterns in buildings. As a result, the sound level can vary significantly at different locations within a home.
Research into low-frequency sound has shown that these properties play an important role in the way sound manifests itself in residential environments (Leventhall, 2004).
This means that measurements at different locations in the same room can sometimes yield divergent results.
Variation in measurements
Field research also regularly shows that measurement results can vary.
Even when multiple professionals take measurements at the same time and in the same room, measurement values may differ. This can be related to, among other things:
• differences in measuring equipment
• differences in measurement methods
• spatial resonance in buildings
• variations in background noise
• time-dependent behavior of sources
Field studies on low-frequency noise show that locating a source is therefore often a careful and sometimes lengthy process (Ostendorf, 2009).
More than a technical issue
Although the physical properties of sound are important, in practice it turns out that low-frequency sound is not exclusively a technical issue.
In many situations, the way people perceive and interpret sound also plays a role.
Human hearing is not a passive receiver of sound. The brain constantly selects, filters, and interprets signals. Attention, expectation, and emotional significance also influence how a sound is experienced.
Research into tinnitus has shown that sound perception is strongly influenced by the interaction between auditory and emotional systems in the brain (Jastreboff, 1990). Psychological processes such as attention and interpretation can also play a role in the perceived burden of sound (Cima et al., 2012).
In addition, the fear-avoidance model describes how attention and uncertainty can amplify bodily or sensory experiences (Vlaeyen & Linton, 2000).
This does not mean that sound experiences must be explained exclusively psychologically. However, it does show that sound perception arises from an interplay of multiple factors.
Towards a broader perspective
The combination of physical properties of low frequencies, variation in measurements, and the complexity of human perception makes low-frequency sound difficult to understand from a single discipline alone.
That is precisely why a broader perspective is needed.
In this handbook, that perspective is described using The Hearing Triptych (Scheijen, 2026) . This model describes sound perception as an interaction between three domains:
sound – brain – human experience.
By considering these three dimensions together, a framework emerges in which both the physical properties of sound and the human experience of it are given a place.
The following essay first addresses a phenomenon that many professionals recognize: the variation in measurements of low-frequency sound .
Literature
Leventhall, H.G. (2004). Low frequency noise and annoyance. Noise & Health.
Ostendorf, C. (2009). How to find the source of low frequency noise: three case studies. Journal of Low Frequency Noise, Vibration and Active Control.
Jastreboff, P. J. (1990). Phantom auditory perception (tinnitus): mechanisms of generation and perception. Neuroscience Research.
Cima, RFF, et al. (2012). Specialized treatment based on cognitive behavioral therapy versus usual care for tinnitus. The Lancet.
Vlaeyen, JWS, & Linton, SJ (2000). Fear-avoidance and its consequences in chronic pain. Pain.
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