The Lucidity Invisible Speaker transforms wall and ceiling surfaces into speakers themselves. Installed behind the gypsum board (or any other material) finish of your wall, the speaker transmits sound through the wall. Placed at every 8' to 12', each speaker creates a speaker out of a 200sf surface. We've heard the sound quality from invisible speakers like this aren't quite as good as traditional speakers, but unless you're a real audiophile, you won't notice. AND, you won't notice your speakers anymore, either!