#antifonic
- Antiphonal — Insulating against noise or damping sound vibrations; pertaining to soundproofing or acoustic reduction. In liturgical or religious music (theology), the term describes a hymnal structure or a mode of vocal performance based on the symmetrical alternation and dialogue between two separate choirs.
- Hearing protector — Personal protective equipment designed to attenuate ambient noise levels and protect the auditory system against acoustic traumas; ear protector. As an adjective, it describes a device, soundproofing material, or substance capable of diminishing harmful acoustic wave intensity.