Monitor Audio IV140 Invisible In-Wall SpeakerThe Monitor Audio IV140 invisible speaker is designed to deliver best in class audio performance in concealed in wall and in ceiling applications. Concealed in wall or in ceilings, the speaker fits into all conventional 4" stud bays, leaving enough room for cabling. Once installed and skimmed with plaster, the speaker is completely out of sight, with paint, light wallpaper or fabric hiding it from view. A large low frequency transducer and two high