Music is often talked about in terms of lyrics, melody, or genre, but underneath all of that is something more fundamental: the sound itself. While listeners rarely think about frequency consciously, psychoacoustic research shows that the brain actively processes sound by breaking it into frequency components, which then shape perception, emotion, and preference (Parncutt, 2012; Fastl and Zwicker, 2007). This means that even subtle changes in how a track is mixed can alter how it is experienced, without the listener necessarily knowing why.
This raises a key question. If the musical content remains identical, can altering frequency balance alone change how much people enjoy a song?
To explore this, a listening experiment was conducted using four versions of the same audio clip, across 4 songs. Each manipulated to emphasise different frequency ranges. Participants were not informed of this manipulation, as the task was presented as a general music perception test. This was important in reducing bias and ensuring responses reflected genuine listening experience rather than expectation. After each clip, participants rated enjoyment, emotional engagement, replay likelihood, and perceived sound quality.
The results revealed a clear and consistent pattern. One version of the clip was significantly preferred (clip1, Bal Freq), receiving the highest ratings across enjoyment, comfort, and perceived quality. In contrast, two versions were consistently rated lower, particularly in terms of replay value and listening comfort (clip 3 and 4, Mid and High Freq). A fourth version produced more moderate responses, suggesting that some changes in frequency were noticeable but not strong enough to significantly influence overall preference.
What makes this particularly interesting is that the musical content remained identical across all versions. The only difference was the frequency balance. This means the variation in listener response can be attributed directly to sound, rather than composition. This supports the idea that listener preference is shaped not only by what a song is, but by how it is presented sonically.
This aligns strongly with psychoacoustic theory. Research suggests that listener responses are influenced by measurable acoustic features, rather than purely musical ones (Flannery and Woolhouse, 2021). In other words, while listeners may not consciously identify differences in frequency, their brains are still responding to them. This helps explain why participants in the experiment showed clear preferences, even without knowing what had been altered.
Shes So Lovely – Scouting for Girls
High Enough – K. FLay
Blackout Days – Phantogram
Ironically, a heavily synthesised track, is more enjoyed when frequency is decreased despite a balanced frequency present. This illustrates that depending on the mix of instruments, repeated frequencies ascend the listening experience for a listener.
Little Bit – Lykke Li
A key explanation for this lies in how low frequencies interact with both the brain and the body. Unlike higher frequencies, bass is not only heard but physically felt, creating a more immersive experience. Studies show that increased low-frequency energy enhances emotional engagement and sensorimotor response, meaning listeners are more likely to feel connected to the music and move in time with it (Herff et al., 2021). This provides a strong explanation for why fuller or more balanced versions of the clip were rated more positively.
More recent research strengthens this further by showing that low frequencies can activate additional neural pathways linked to reward and emotional processing. This suggests that bass-heavy or fuller mixes do not just sound better, but are processed differently at a neurological level, leading to stronger emotional responses.
In contrast, high-frequency emphasis appears to have the opposite effect. Psychoacoustic research identifies “sharpness” as a key factor in perceived unpleasantness, with increased high-frequency energy linked to reduced comfort and listener fatigue (Zwicker and Fastl, 2007). This provides a clear explanation for why the lower-rated versions of the clip were perceived as less enjoyable.
This is further supported by neurological studies. Oohashi et al. (2000) demonstrated that high-frequency components, even those beyond conscious hearing, can influence brain activity. This suggests that listeners may experience discomfort or reduced enjoyment without being able to consciously identify the cause, which aligns with the responses observed in the experiment.
When considered together, this creates a strong case study linking primary research with existing academic literature. The results of the listening experiment do not contradict established research, but instead reinforce it. Both suggest that frequency balance plays a measurable and consistent role in shaping listener experience.
This is important because it moves the discussion beyond subjective taste. Rather than simply saying people “prefer bass” or “dislike harsh sounds”, the evidence suggests that these preferences are rooted in how the brain and body process sound. Low frequencies enhance immersion and emotional engagement, while excessive high-frequency content can lead to discomfort, even if the listener is not consciously aware of it.
There are some limitations to consider. The experiment was conducted within a classroom setting using a relatively small sample size, meaning the findings may not fully represent wider listening behaviours. In addition, differences in listening equipment used for testing may have influenced responses. However, the consistency of the results, combined with their alignment with established research, suggests that the findings are not isolated but part of a broader pattern.
Ultimately, this research demonstrates that listener preference is not determined solely by songwriting, but by the physical and neurological experience of sound itself. Even when melody, lyrics, and structure remain unchanged, frequency balance can significantly alter how music is perceived.
In that sense, this study goes beyond simply exploring preference. It effectively tests the legitimacy of existing psychoacoustic research within a real listening context, showing that the relationship between frequency, perception, and listener response is not only theoretical, but observable, consistent, and grounded in both data and experience.
References
Alluri, V., Toiviainen, P., Jääskeläinen, I.P., Glerean, E., Sams, M. and Brattico, E. (2012) ‘Large-scale brain networks emerge from dynamic processing of musical timbre, key and rhythm’, NeuroImage, 59(4), pp. 3677–3689.
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Fastl, H. and Zwicker, E. (2007) Psychoacoustics: Facts and Models. 3rd edn. Berlin: Springer.
Flannery, D. and Woolhouse, M. (2021) ‘The relationship between acoustic features and music preference’, Music & Science, 4.
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Herff, S., Zamm, A., Chen, J. and Pfordresher, P. (2021) ‘The effect of low-frequency equalisation on preference and sensorimotor synchronisation in music’, Frontiers in Psychology, 12.
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Huron, D. (2006) Sweet Anticipation: Music and the Psychology of Expectation. Cambridge, MA: MIT Press.
Levitin, D.J. (2006) This Is Your Brain on Music. New York: Dutton.
North, A.C. and Hargreaves, D.J. (2008) The Social and Applied Psychology of Music. Oxford: Oxford University Press.
Oohashi, T., Nishina, E., Honda, M., Yonekura, Y., Fuwamoto, Y., Kawai, N., Maekawa, T., Nakamura, S., Fukuyama, H. and Shibasaki, H. (2000) ‘Inaudible high-frequency sounds affect brain activity: Hypersonic effect’, Journal of Neurophysiology, 83(6), pp. 3548–3558.
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Parncutt, R. (2012) The Psychology of Music.
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Zwicker, E. and Fastl, H. (2007) ‘Sharpness’, in Psychoacoustics: Facts and Models. Berlin: Springer.
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