Originally Posted by sdurani
So dipoles may still have the advantage, even on soundtracks that were redone for the home video release. Keep in mind that THX originally recommended dipole surrounds because they more closely mimicked the surround arrays found in commercial theatres and mixing stages. IF that sort of playback is your goal, then dipoles will get you closer to those results than a couple of monopoles.
This is the reason I like di-pole and recommend them. Here is more reasons I like them
* Dipolar create a more open space of sound without the listener being able to pinpoint the source of the sound.
* Unlike bipolar speakers, the drivers in dipoles aren’t moving in and out at the same time. One driver pushes air while the other pulls. So when the dipoles are placed properly, at 90° from the screen, directly to the left and right of the listener, they create a null zone—an area in which the sound coming from each speaker effectively cancels itself out, usually in the off-axis middle area facing the listener. The sound coming straight toward the listener’s ears is effectively dampened, and instead the listener hears virtually nothing but reflections from the room boundaries. So instead of perceiving sounds as coming from the speaker itself, the result is a diffuse sound-field.
* This design offers a more diffuse, spacious sound than a direct-radiating model. This is what surround speakers should do, after all. They are intended to reproduce ambient effects.
* Dipolar models are favored for THX-certified designs specifically because of their diffuse sound, which more accurately resembles what you would hear in a real movie theater.
* According to Dolby Laboratories: “Surround speaker placement, room acoustics, and personal preference are as important as the speakers’ radiating characteristic. These factors vary greatly, so Dolby Laboratories cannot recommend a particular speaker for home theater use.”
* Dipoles are a closer match to the surround speaker arrays found in movie theaters.
* Ambience and envelopment are the goals of surround speakers, not the 3D holographic rear stereo images. Dipoles do a better job at envelopment due to the sound being directed away from the listener. Having the forward and backwards firing sounds out-of-phase makes the speaker harder to pinpoint.
* Dipoles have a bigger surround sweet spot than direct radiating surrounds have.