The recent rise of the "sound horeg" phenomenon in Indonesia—a cultural trend involving the installation of massive, high-powered sound systems on trucks or platforms during parades and community festivals—has sparked a polarized national debate. While proponents argue that these displays are a testament to creative engineering and communal joy, medical professionals and urban planners are increasingly sounding the alarm regarding the severe physiological and psychological consequences of such extreme decibel levels. Beyond the temporary discomfort of ringing ears, prolonged exposure to high-intensity sound triggers complex biological stress responses that can have lasting implications for human health.
The Evolution and Context of Sound Horeg
The "sound horeg" movement originated in East Java, quickly transitioning from local village celebrations to a broader cultural spectacle. These systems are not merely oversized speakers; they are often custom-built rigs capable of producing low-frequency bass vibrations that can literally shake windows and structures several meters away. Originally intended to enliven cultural parades and wedding processions, the scale of these systems has grown exponentially over the last five years.
However, the rapid escalation in power output has outpaced local regulations. In many instances, these events occur in densely populated residential areas or near schools and hospitals, where noise pollution guidelines are rarely enforced. The phenomenon has become a hallmark of regional festivals, yet the lack of standardized safety protocols has turned these celebrations into potential health hazards for both participants and bystanders.
Physiological Impacts: Beyond the Eardrum
When the human ear is subjected to sound pressure levels exceeding 85 to 90 decibels for extended periods, the risk of permanent noise-induced hearing loss (NIHL) increases significantly. Most "sound horeg" setups operate well beyond 100 decibels, approaching the threshold of physical pain.
However, the medical community emphasizes that the damage is not limited to the auditory system. According to research published by UCLA Health and supported by the World Health Organization (WHO), noise pollution acts as a potent environmental stressor. When the brain perceives loud, sudden, or persistent noise, it interprets the sound as a signal of potential danger. This triggers the hypothalamic-pituitary-adrenal (HPA) axis, resulting in the release of cortisol and adrenaline.
The Biological Stress Response
The body’s "fight or flight" mechanism is designed for acute survival, not for constant activation by environmental noise. When a person is trapped in a space dominated by high-intensity audio:
- Cardiovascular Strain: The persistent release of stress hormones causes blood vessels to constrict and heart rates to accelerate. Studies have shown a direct correlation between chronic noise exposure and hypertension (high blood pressure). Over months or years, this elevates the risk of myocardial infarction (heart attack) and stroke.
- Endocrine Disruption: Chronic cortisol elevation, a byproduct of persistent stress, can lead to metabolic imbalances, weakened immune function, and digestive issues.
- Neurological Fatigue: The brain must exert significant cognitive effort to filter out unwanted, overwhelming sound stimuli. This process, often referred to as "cognitive overload," leads to mental exhaustion, reduced concentration, and impaired executive function.
Mental Health and Long-term Implications
The psychological impact of noise pollution is often underestimated. Public health experts have noted that individuals living in areas frequently subjected to extreme noise levels report higher incidences of irritability, anxiety, and depressive symptoms. The inability to find a "quiet space" or sanctuary from the noise contributes to a state of hyper-arousal, where the nervous system remains in a constant state of alert.
For children, the implications are even more concerning. Developmentally, exposure to loud, erratic noises can interfere with learning, speech development, and cognitive processing. Research into "noise-induced stress" in urban environments indicates that students in high-noise areas consistently perform lower on standardized tests involving reading and memory, largely due to the brain’s inability to focus amidst the acoustic clutter.
Regulatory Challenges and Official Responses
The Indonesian government and local administrations have faced mounting pressure to regulate the "sound horeg" industry. In several regencies, local police have begun issuing guidelines requiring event organizers to obtain permits that include noise-level limits. However, enforcement remains inconsistent.
Public health officials have suggested that the "Sound horeg" industry should be treated similarly to industrial noise pollution. Under international standards, workplaces are strictly regulated regarding the number of hours an employee can be exposed to specific decibel levels. If these standards were applied to public street parades, the majority of current "sound horeg" setups would be deemed illegal and unsafe.
Representatives from local health departments have recently urged the public to exercise caution. "It is not just about whether you can hear the music," noted one public health advocate. "It is about the invisible toll that pressure waves are taking on your heart, your brain, and your mental equilibrium."
Mitigation Strategies: Protecting Public Health
For those who choose to attend events where high-intensity sound is present, medical experts recommend a multi-layered approach to protection:
- Distance as a Primary Defense: Sound intensity follows the "inverse square law," meaning that even a small increase in distance from the sound source results in a significant reduction in sound pressure. Avoiding the "front row" of a sound system is the most effective way to prevent immediate trauma.
- Personal Protective Equipment (PPE): High-fidelity earplugs, which attenuate volume without muffling the quality of the sound, are highly recommended. For extreme environments, industrial-grade earmuffs provide the necessary seal to block low-frequency vibrations that can travel through the skull.
- The "Quiet Break" Rule: The body requires recovery time. Experts suggest that for every hour of exposure to loud noise, the individual should seek at least 15 to 30 minutes of complete silence to allow the nervous system to recalibrate and stress hormones to return to baseline levels.
- Awareness of Symptoms: Individuals should be educated to recognize the warning signs of overexposure: ringing in the ears (tinnitus), a feeling of fullness in the ears, muffled hearing, or a sudden onset of anxiety/palpitations. If these occur, immediate withdrawal from the area is necessary to prevent long-term damage.
The Path Forward: Balancing Tradition and Safety
The challenge for local authorities lies in balancing the cultural enthusiasm surrounding these events with the fundamental right of citizens to a healthy, stress-free living environment. There is no call to ban cultural expression, but there is an urgent need for "Acoustic Urbanism"—the design and regulation of public spaces to manage noise effectively.
Future solutions may include:
- Zoning Restrictions: Implementing "quiet zones" within city planning where high-decibel equipment is prohibited.
- Decibel Caps: Enforcing maximum decibel limits for public events, monitored by independent noise control officers.
- Event Design: Encouraging the use of directional sound technology, which focuses audio toward the intended audience rather than radiating it across entire neighborhoods.
As the "sound horeg" phenomenon continues to evolve, the discourse must shift from mere celebration to a broader conversation about health and safety. The human body is not built to withstand the sustained acoustic pressure of industrial-grade audio systems. Protecting the community from these invisible risks is not an attack on culture, but a necessary evolution of public health policy in an increasingly noisy world. Without standardized, evidence-based regulation, the short-term joy of a parade risks leaving a long-term legacy of chronic health conditions for the generations to come.







