👉 In acoustics, a subecho is a low-frequency sound that is produced by the interaction between two objects or particles, such as air molecules. Subechoes are often observed in the audio spectrum and can be caused by the absorption of acoustic waves by small particles like air molecules or dust particles. They are typically associated with the presence of moisture in the atmosphere, which causes the water vapor to condense into tiny droplets or ice crystals. Subechoes occur when a sound wave passes through
