User manual B&W DM 640

[. . . ] (figures 4 & 5) All connections should be made with the equipment switched off. There are 2 pairs of terminals at the back of the speaker which permit bi-wiring if desired. [. . . ] On delivery, the separate pairs are connected together with high-quality links for use with a single 2-core cable. For single cable connection, leave the links in place and use either pair of terminals on the speaker (figure 4). ensure the positive terminal on the speaker (marked + and coloured red) is connected to the positive output terminal of the amplifier and negative (marked ­ and coloured black) to negative. To bi-wire, remove the links by loosening the terminal caps and use a separate 2-core cable from the amplifier to each pair of terminals. When bi-wiring, incorrect connection can also impair the frequency response (figure 5). Keep the total impedance below the maximum recommended in the specification and use a low inductance cable to avoid attenuation of the highest frequencies. Before fine tuning, double check that all the connections in the installation are correct and secure. If the cabinet rocks, unscrew the appropriate spikes until the speaker stands firmly on the floor and lock them in place by tightening the lock nuts against the base. If you do not have a carpet, use a protective disc under the spikes to protect the floor surface. (figures 2 & 3) Do not fit the spike feet until you have found the best position for your speakers. The speaker drive units create stray magnetic fields that extend beyond the boundaries of the cabinet. We recommend you keep magnetically sensitive articles (television and computer screens, computer discs, audio and video tapes, swipe cards and the like) at least 0. If you wish to use an aerosol cleaner, remove the grille first by gently pulling it away from the cabinet. The grille fabric may be cleaned with a normal clothes brush whilst the grille is detached from the cabinet. [. . . ] The grille fabric may be cleaned with a normal clothes brush whilst the grille is detached from the cabinet. Avoid touching the drive unit diaphragms, especially the tweeter, as damage may result. [. . . ]