From the Manufacturer
The Cambridge SoundWorks Surround 5.1 surround sound speakers feature more output than their smaller counterparts, the Surround II 5.1, and are suggested for use with most surround sound systems. These state-of-the-art surrounds use MultiPole technology so they can be switched from dipole (diffuse radiation) to bipole (direct radiation) operation. This makes them the ideal speakers for use with any surround sound system, especially Dolby Digital systems which send distinctly different signals to the right and left surround speakers. The MultiPole switch on the Surround 5.1 alters the directionality of the speaker. Dipole mode sends the mid- and high-frequency output along the side walls, so all the listeners hear a diffused, enveloping sound. Bipole mode concentrates this output toward the listening area, providing central listeners more precise imaging. For all Dolby Pro Logic Recordings and most current Dolby Digital recordings we recommend the dipole mode. For some Dolby Digital recordings such as those with lots of lateral sound positioning crafted into the rear channels, the bipolar mode is a better choice.
Charcoal, also available in White.