User manual B&W CCM20

[. . . ] Since its foundation in 1966, the continuing philosophy of B&W has been the quest for perfect sound reproduction. Inspired by the company's founder, the late John Bowers, this quest has entailed not only high investment in audio technology and innovation but also an abiding appreciation of music to ensure that the technology is put to maximum effect. [. . . ] Home Theatre Surround Speaker Applications The sound from surround speakers should be as diffuse as possible. This ensures that the frontal audio image is not distorted by changes of listener position or head movements. The orientation is less important in this application than in other cases. WARNING: The CCM speakers produce a static magnetic field that extends outside the cabinet boundary. The frame has a paintable white semi-matte finish, ready if necessary to be re-finished to match your own decor. Failure to observe correct polarity will result in ill-defined panning of sounds and strange phase effects. When choosing cable, keep the total electrical impedance (out and back) below the maximum recommended in the specification. Ask your dealer for advice, as the optimum cable will depend on the length required. Remove the grilles from the wall frames and, to avoid damage, keep them in their plastic bags (and preferably in the carton) away from the work area until you are ready to fit them. In addition, loosely fill the whole section of the cavity with wadding. Fibreglass and mineral wool matting supplied for heat insulation are suitable, but not closed cell foam or expanded polystyrene. Check that there is no debris that may fall into the speaker (especially in ceiling mount situations). [. . . ] A certain amount of flexing of the frame is allowed to take up unevenness in the mounting surface, but do not over tighten the screws as excessive distortion of the frame may occur. Nominal impedance Frequency response Sensitivity Crossover frequency Recommended amplifier power Frame size Cut-out size Min depth required Net weight Finishes Reserves the right to amend details of the specification without notice in line with technical developments. [. . . ]