Originally Posted by Jim McC
Maybe I'm not wording things correctly. Assuming I can mount bipoles on rear wall, or dipoles on the sides, which would be better for MY SITUATION? Being that my couch is so close to rear wall, should I mount on rear wall or sides? When I am seated, my ears are about 2' from rear wall. Thanks.
Dipoles are designed for the "null" to be aimed at the listener. IOW, when mounted at the listener's sides, they direct the sound towards the front of the room and the back of the room, but with very little sound focused directly at the listener. This provides a very non-directional, spacious, ambient soundfield. This is fine whenever ambiance is the intended soundfield. However, when specific directionality is called for in the surround track, a non-directional speaker will have a hard time portraying it.
For "current" movie soundtracks which have a lot of "directional" surround information, bipoles or monopoles are much better choices than non-directional dipoles.
(Edit: Because of the specific aiming requirements for dipoles, they generally do not work well in non-standard (for dipoles) installations. IOW, you don't want to install dipoles on the back wall, behind you. You end up sitting in the direct path of one side of the dipole, and completely outside the "null" area. In this case, you would be better off with wide dispersion bipoles, or front firing monopoles.)