If you are looking to set up or add to a home theater system, or sound system and you are seriously committed, please read on. Sometimes in-wall speakers are the only solid way to go. Not only do they add a touch of professional style to your in-home theater set-ups but they allow for a more immersive over-all sound experience.  Mounting directly into wall or ceiling can aid surround sound set-ups and make them much more spatially accurate sound reproduction.
They are a great solution for smaller space as they have no footprint within the room itself.  If you're tired of untidy wires then they are are also advantageous.
In-wall speakers also do a great job when “ghosting” of the center channel is required. While floorstanding and bookshelf speakers can be toed in to achieve a better soundstage, in-wall speakers are often optimized such that their separation is best set by the calculated distance to the seated area. That means that the width or distance between the speakers is calculated to ensure the stereo image is perfect from the center seat. Since most in-wall speakers have a nice wide horizontal dispersion, multiple center seats are often perfectly optimized for stereo imaging.