The frequency arms race is not a conspiracy but a quiet reality in which sound has become a powerful, invisible form of infrastructure shaping human behavior, emotion, productivity, and compliance across public spaces, workplaces, and digital environments. Governments and corporations increasingly deploy engineered sound—from crowd-control devices and surveillance acoustics to retail music, office noise, and app notifications—to influence physiology, cognition, and decision-making, often without awareness or consent. Chronic exposure to these soundscapes alters stress levels, mood, memory, and autonomy, with disproportionate harm to neurodivergent individuals. The article argues that unchecked sonic design risks creating acoustically conditioned societies where silence disappears and control feels like comfort, while also acknowledging that sound can heal, support, and include when used ethically. The path forward lies not in fear but in literacy, transparency, personal awareness, ethical governance, and collective action to reclaim sonic autonomy—ensuring sound serves human dignity rather than quietly eroding it.