(physics) A wave of fluctuating temperature or entropy propagated in the superfluid phase of liquid helium

A thin board that forms part of the resonating chamber of a musical instrument and serves to reinforce its sound / A structure that reflects sound towards the intended listeners

An artificially created or enhanced sound, used to accompany the action of a dramatic production, such as a film, play or video game

(music) A subgenre of country music that became popular in the 1950s and 1960s, containing elements of popular music and characterized by electronic string sections, background vocals, and orchestras.

An acoustic mirror.

plural of sound mirror

plural of sound post

(UK, informal) wholesome; reliable; in good condition

(sound, headphones) the property of blocking off outside sound through use of materials that reduce sound transmission from the exterior environment into the interior environment

Perfectly sound.