Creating audible sound requires very little energy
Environmental sounds like speech and music possess very low energy density, motivating the development of sensitive acoustic energy harvesters.
The retrieved literature consistently discusses how ambient acoustic waves (such as speech or everyday environmental sounds) carry very low energy density or low-amplitude mechanical energy, supporting the claim that creating or capturing audible sound involves small amounts of energy.
Yin J, Wang S, Xu J, Zhao X, Chen G, Xiao X, Chen J. Leveraging giant magnetoelasticity in soft matter for acoustic energy harvesting.. 2025. https://doi.org/10.1016/j.matt.2025.102156
Discusses the challenge of recycling energy from low-density acoustic waves found in everyday sounds such as speech and music.
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Cui Y, Yang T, Luo H, Zheng Y. Triboelectric Nanogenerators Promote Self-Powered Sensing and Intelligent Monitoring.. 2026. https://doi.org/10.3390/s26102984
Notes that triboelectric nanogenerators can efficiently harvest widely available low-frequency, low-amplitude distributed mechanical energy in the environment.
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