Wrong completely wrong, I am a trainded Theater Designer and there is no special voicing for a Home Theater speaker, they are not brighter or duller than a Music Speaker.
As Shadorne said ATC make excellent Home Theater Speakers so do KEF it comes down to these factors:
1: Power Handling and efficiency. A good Theater speaker has the ability to play loud so efficiency and power handling are inportant.
2: Controlled Dispersion, you want to have a wide Horizontal dispersion and Limited Vertical dispersion so not to bounce sound off of the ceiling, the D'Appolito configuration was designed to do just this.
3: Timberally accurate a good Theater speaker will sound as accurate as possible with an even frequency response.
4: Dynamic capabilities: A good Theater speaker can track highly dynamic passages without distortion.
One of the biggest difference is the concept of imaging which is not really important in a Theater design but very important in a Music System.
So when you place speakers against a wall you are not going to get the kind of depth of field in image that will happen when you do so, so in reality that is one of the biggest differences between the world of Theater and Music systems.
Also a Theater room is going to have much greater damping to control reflections then a pure two channel Music Room.
Check out our Theater we built for DIY Network Rev Run's Rennovation
https://www.flickr.com/photos/58319891@N08/albums/72157650239108910
https://www.flickr.com/photos/58319891@N08/albums/72157650233548529
You will notice that we use KEF THX speakers which hit all the criteria required for a good Theater, high power handling, wide dispersion, low distortion, tonally accurate,wide dynamic range.
Dave owner chief designer
Audio Doctor NJ