Cover Materials

• The key to invisible speakers are their covers, called radiating diaphragms. These rigid, flat panels are built of proprietary materials which transmit sound but which have an exterior texture similar to that of standard wallboard. The diaphragms are finished with paper that can accept the skim-coat plaster used to finish interior walls.
  
  

Speaker Technology

• Behind the radiating diaphragms, invisible speakers use high-power tweeters and woofers that are designed to project sound in a hemispheric polar pattern, providing even sound distribution on the other side of the wall or ceiling. Woofer cones are frequently designed to project low-frequency vibrations into the surrounding wall materials themselves.
  
  

Installation and Finishing Options

• In new construction, invisible speakers are installed in housings that fit between the wood studs in the walls. The outer diaphragms are then screwed directly to the studs. The surrounding wallboard is installed, and the joints between the diaphragm and the wallboard are tapped. Finally, skim coat is applied over the entire wall, completely concealing the speaker. The wall over the speaker can then be painted, or even covered with a light wallpaper, without significantly affecting the sound quality.
  
  

Sound Performance

• Although they're buried in the wall, invisible speakers can provide extremely good sound performance. Invisible speakers typically provide frequency ranges from 40 Hz all the way up to 20 kHz. They also generate fairly even hemispherical sound distribution patterns, even at frequencies as high as 16 kHz.