Why 432 Hz?
The tuning of A at 432 Hz is often called the "scientific pitch" or "Verdi tuning." Many musicians and listeners perceive it as more natural, harmonious, and calming compared to the modern standard of 440 Hz.
Binaural Beats and Meditation
Binaural beats are an auditory illusion created when two slightly different frequencies are played in each ear. The brain perceives a third tone — the difference between the two — which can influence brainwave states (alpha, theta, delta), promoting relaxation, focus, or deep meditation.
All music on 8hz.it is composed and performed at 432 Hz. This tuning resonates with the natural frequency of water, the human body, and the harmonic ratios found in the universe.
Still weak, but promising and interesting.
The scientific literature on music tuned to 432 Hz is still limited but now includes several clinical, physiological, and experimental studies evaluating possible effects on biological and psychophysiological parameters. Overall, the available evidence can be considered preliminary: several studies indicate effects consistent with relaxation, anxiety reduction, neuroendocrine modulation, or changes in autonomic parameters. However, it is not yet possible to state that 432 Hz music has specific, universal, or conclusively proven therapeutic biological properties.
Note on the scope of this summary: Only studies using music or sound interventions tuned to 432 Hz are considered. Studies on isolated single frequencies, plants treated with different frequencies, or speculative interpretations without experimental verification are excluded.
One of the first studies directly comparing 432 Hz vs. 440 Hz music was conducted by Calamassi and Pomponi (2019) with a double-blind, crossover pilot design on healthy volunteers. After listening to 432 Hz music, a mean heart rate reduction of about 4.8 beats per minute was observed, while respiratory rate reduction approached statistical significance. Participants also reported greater focus and satisfaction when listening to the 432 Hz version.
In dentistry — where anxiety, anticipatory stress, and physiological activation are easily measurable — 432 Hz music has been studied more frequently. In a randomized study on patients undergoing endodontic treatment, listening to 432 Hz music was associated with significant reductions in systolic pressure, diastolic pressure, and heart rate during the procedure. However, the comparison was between 432 Hz music and no music, not between 432 Hz and 440 Hz; thus, the result supports music as a non-pharmacological anxiolytic intervention but does not alone demonstrate the specific superiority of 432 Hz tuning.
A more specific randomized clinical trial compared 432 Hz music, 440 Hz music, and no music in patients undergoing tooth extraction. Both music groups showed reduced anxiety compared to the control group. The most interesting finding concerned salivary cortisol: the group exposed to 432 Hz music had lower mean cortisol levels than both the 440 Hz group and the no-music group, suggesting a possible stronger biological effect on a stress indicator.
Further dental studies have evaluated 432 Hz music in procedures such as third molar surgery and root canal therapy. Overall, these studies support the use of 432 Hz music as a possible non-pharmacological support in dental settings but do not allow the effect to be attributed with certainty to the tuning alone.
432 Hz music has also been studied in healthcare workers exposed to work-related stress. In a randomized, double-blind pilot study on emergency personnel during the COVID-19 pandemic, state anxiety decreased in all groups, but 432 Hz music was also associated with significant reductions in respiratory rate and systolic pressure, suggesting a possible relaxing physiological effect.
A small study on volunteers with delayed sleep latency evaluated the effect of 432 Hz music during daytime napping. The most relevant finding was an increase in alpha activity at sleep onset, interpreted by the authors as a possible indicator of a calming effect.
Another pilot study on patients with spinal cord injury compared preferred music tuned to 432 Hz vs. 440 Hz. After the 432 Hz listening period, sleep quality improved statistically significantly, while the 440 Hz period showed no comparable improvement.
A recent randomized crossover study on cancer patients evaluated sound interventions tuned to 432 Hz using a body monochord. After the 432 Hz intervention, a more pronounced reduction in heart rate and an increase in heart rate variability — an indicator often associated with better autonomic regulation — were observed.
Studies on rats indicate that 432 Hz music may be associated with measurable biological changes, including alterations in the expression of ghrelin and neuropeptide Y in the hypothalamus, and changes in body weight.
In sports, studies on athletes and kickboxers have reported that 440 Hz music during warm-up produced more marked effects on physical performance compared to 432 Hz music, suggesting that the effect depends on context and goal.
Overall Assessment
Overall, it can be stated that there is initial scientific evidence that music tuned to 432 Hz can produce measurable effects on biological and psychophysiological variables. Reported effects include reductions in heart rate, respiratory rate, blood pressure, anxiety, salivary cortisol, improvements in sleep, changes in brain activity, and neuroendocrine modifications in animal models.
However, the strength of the evidence remains weak or moderately low. The most prudent conclusion is that 432 Hz music may represent an interesting research field and a possible non-pharmacological relaxation tool in some contexts, especially related to anxiety, stress, and rest. However, it is not scientifically justified, at the current state, to attribute to it universal therapeutic properties or biologically superior stability compared to other tunings.
First evidence on the effects of binaural beats in meditative states, relaxation, and psychophysiological regulation.
What are binaural beats? Binaural beats are a perceptual phenomenon that occurs when two pure tones of slightly different frequencies are presented separately to each ear, typically via stereo headphones. For example, if one ear receives a 200 Hz tone and the other a 208 Hz tone, the auditory system may perceive an internal pulsation corresponding to the difference between the two tones — 8 Hz. This "third frequency" is not actually present as an external sound wave but is generated by the nervous system.
The interest in binaural beats stems from the fact that the perceived beat frequency can fall within the same range as the main brain electrical activity bands measured by electroencephalography: delta, theta, alpha, beta, and gamma. This observation leads to the auditory brainwave entrainment hypothesis, according to which rhythmic external stimulation might facilitate partial synchronization of brain activity toward the stimulus frequency. However, a 2023 systematic review concluded that evidence for the ability of binaural beats to induce brain entrainment remains heterogeneous and inconclusive.
The phenomenon of binaural beats is generally attributed to Prussian physicist Heinrich Wilhelm Dove, who described it in 1839. Modern interest was revived in 1973 by Gerald Oster's article "Auditory Beats in the Brain" in Scientific American. Since then, binaural beats have been studied for their potential effects on attention, memory, anxiety, pain, sleep, and relaxation.
In meditative contexts, binaural beats are typically used as a support for inducing states of relaxation, introspection, or focused attention. The frequencies most often associated with these uses are in the theta and alpha bands. A review in Frontiers in Psychiatry described auditory beat stimulation as a promising tool for modulating cognitive processes and mood states, while emphasizing the strong heterogeneity of results and experimental protocols.
A meta-analysis in Psychological Research included 22 studies and evaluated effects on cognition, anxiety, and pain perception, reporting a moderate and statistically significant overall effect, though dependent on protocol characteristics.
A 2024 systematic review concluded that binaural beats showed better results compared to some control conditions, such as no music or acoustic isolation, but highlighted the need for more homogeneous and methodologically robust studies.
Randomized studies on chronic pain patients reported that acoustic therapy with theta-range binaural beats reduced pain intensity, stress, and analgesic use. However, a 2024 systematic review rated the overall quality of evidence as low or very low.
The main methodological problem is distinguishing the specific effect of the binaural beat from the broader effect of the sound context: slow music, pleasant acoustic environment, positive expectation, isolation from distractions, slower breathing, and meditative disposition may all contribute to the outcome.
The 2023 systematic review published in PLOS ONE concluded that, at present, the evidence is insufficient to generally state that binaural beats induce reliable brain entrainment. The possible effect may depend on more complex mechanisms: relaxation induced by listening, focused attention, expectation, individual characteristics.
Overall Assessment
Scientific evidence on binaural beats is interesting but still weak and not definitive. Some studies and meta-analyses suggest positive effects on anxiety, stress, pain, sleep, mood, and attention. Others do not confirm a clear effect or show that results depend strongly on the protocol used.
In meditative contexts, their most realistic value seems to lie in offering a stable sound structure capable of facilitating inner listening, distraction reduction, and entry into a conscious relaxation practice. The benefit, when present, may derive as much from the binaural beat as from the entire listening experience: headphones, isolation, meditative intention, continuous sound, breath, and psychological disposition.
References (432 Hz studies):
1. Calamassi D., Pomponi G.P. Music Tuned to 440 Hz Versus 432 Hz and the Health Effects. Explore, 2019.
2. Di Nasso L., et al. Influences of 432 Hz Music on the Perception of Anxiety during Endodontic Treatment. Journal of Endodontics, 2016.
3. Aravena P.C., et al. Effect of music at 432 Hz and 440 Hz on dental anxiety and salivary cortisol levels. Journal of Applied Oral Science, 2020.
4. Calamassi D., et al. Music tuned to 432 Hz versus music tuned to 440 Hz for improving sleep in patients with spinal cord injuries. Acta Biomedica, 2020.
5. Calamassi D., et al. Listening to music tuned to 440 Hz versus 432 Hz to reduce anxiety and stress in emergency nurses. Acta Biomedica, 2022.
6. Hohneck A., et al. Differential effects of sound interventions tuned to 432 Hz or 443 Hz on cardiovascular parameters in cancer patients. BMC Complementary Medicine and Therapies, 2025.
7. Russo C., et al. Effects of different musical frequencies on NPY and Ghrelin secretion in the rat hypothalamus. Brain Research Bulletin, 2017.
8. Jebabli N., et al. Effect of listening to preferred music at different frequencies during warmup on physical performance. Scientific Reports, 2025.
References (Binaural Beats studies):
1. Oster G. Auditory Beats in the Brain. Scientific American, 1973.
2. Lane J.D., et al. Binaural Auditory Beats Affect Vigilance Performance and Mood. Physiology & Behavior, 1998.
3. Chaieb L., et al. Auditory Beat Stimulation and its Effects on Cognition and Mood States. Frontiers in Psychiatry, 2015.
4. García-Argibay M., et al. Efficacy of binaural auditory beats in cognition, anxiety, and pain perception: a meta-analysis. Psychological Research, 2019.
5. Ingendoh R.M., et al. Binaural beats to entrain the brain? A systematic review. PLOS ONE, 2023.
6. Yusim A., Grigaitė U. The Efficiency of Binaural Beats on Anxiety and Depression—A Systematic Review. Applied Sciences, 2024.