We feel that there are two ways to go for speaker placement. The first is in social areas where multiple people are gathering. Examples are the kitchen, the dining room, the living room, and the entry way.
The second is in stationary rooms where one person sits in the same place. This includes the study, the sitting room, the bedroom, and the library.
In social areas, it’s best to use in-ceiling speakers placed equally about the room. For an approximate 15’x15′ room, a pair of in-ceiling speakers is ideal. If you’re getting into a larger room, then two pairs is recommended. For really big rooms like function halls, you should have one speaker every 15 linear feet that you have.
For rooms with can lighting, try to match your speakers to your lighting pattern.
Wall speakers are best suitable for stationary rooms. You can take advantage of that feeling of stereo being in the middle of the two speakers creating an image that’s projected in your minds eye. The placement here is basically ear level or a little higher, and the width should be approximately a 45-degree separate.