User manual B&W CCM 618

[. . . ] 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 and movies to ensure that the technology is put to maximum effect. These CCM speakers are intended for inceiling applications. They feature adjustment for tweeter angle and output level so that their performance may be tailored to a wide variety of practical conditions. [. . . ] 1 channel Position two speakers to the sides in line with the centre of the listening area and two behind the listeners, subtending an angle of approximately 40º. This pack should contain: 2x 2x 2x 2x Frame/baffle with drivers and crossover Grille Paint mask Mounting template Check that there is no conflict with other installations (pipe work, air conditioning, power cabling etc. In existing drywall construction, use a stud-finding tool to map the construction accurately and a pipe detector to scan the proposed installation position. Ensure that there is enough clearance behind the plasterboard (sheetrock) for the clamps to swing out fully. avoid installing the speakers in the same cavity as flimsy ducting , which may be induced to rattle. The speakers are designed to operate satisfactorily in a wide range of cavity volumes, ideally above 10 litres (0. 4 cu ft), so make sure the volume is not too restricted. To maintain clarity and speech intelligibility, it's important that listeners are never too far off axis of the nearest speaker. The speaker spacing will depend on the height of the ceiling and the level of sound required. More speakers played at a lower level will give better clarity. We recommend that the distance between adjacent speakers is no more then 3 times the distance between average ear height and the ceiling. For any given spacing, there will be fewer weak spots with a triangular grid than a rectangular one. Should service be required, please follow the following procedure: 1 If the equipment is being used in the country of purchase, you should contact the B&W authorised dealer from whom the equipment was purchased. If the equipment is being used outside the country of purchase, you should contact B&W national distributor in the country of residence who will advise Always try to keep The resistance as low as possible with the loop resistance preferably below 0. Use the table of figure 10 to calculate the minimum gauge of cable required. This, in conjunction with rotating the whole speaker, allows you to optimise the sound dispersion in relation to the listening area. (figure 8) Direct the tweeter towards the listening area to improve high frequency definition and imaging if the speaker has to be mounted too far off line. Conversely, in surround applications, it may be desirable to point the tweeter away from the listening area to create a more diffuse sound field. The switch on the front baffle provides boost or cut to the speaker's highfrequency output level to compensate for listeners positioned severely off axis or a dull acoustic (boost) or highly reflective rooms (cut). Trace round the outer edge of the template and cut neatly just inside the line. [. . . ] (figure 7) IMPORTANT: Ensure that the materials you use meet local fire and safety regulations. All connections should be made with the equipment switched off. connect the cables , observing the correct polarity. With the grille removed, position the speaker in the aperture and screw in the 4 screws visible from the front. [. . . ]