American company OSD offers a dedicated "Black" series of high quality in-ceiling and in-wall speakers with a slim frame grille. They are easy to install, have back dust cover and rubber feet toprevent a dry-wall/ceiling breaking when tighten screws. Except for typical mono and stereoinstallation speakers OSD Black offers low-depth and water-resistant models. There are alsoinstallation speakers for Home Cinema: round in-ceiling and rectangular in-wall speakers. In additionOSD Black manufactures a few in-wall and in-ceiling passive subwoofers.