4.2If speaker cable is already present in the ceiling space, pull the cable down through the aperture. If speaker cables are not already installed this should be done at this stage. It is likely that you will need to gain access through the floor above to route the cables through the ceiling space.
Leave enough spare cable through the aperture to ease connection to the speaker back box, but not so much that it is likely to buzz or rattle when pushed back up into the ceiling space. Approximately 1.0m (40 in) is appropriate.
Note: Always use high quality, low resistance speaker cable. Low resistance is especially important if the length of cable from amplifier to speaker exceeds 5.0m. Your local Bowers and Wilkins retailer will be able to offer advice on speaker cable selection if required.
4.3CCM7 Series speaker back boxes are fitted with a safety hook feature that enables a safety chain or cable to be attached and then secured to a structural element within the ceiling – typically a stud (joist). We strongly recommend the safety hook feature is used. The diagram above illustrates the use of the safety hook.
4.4Now connect the speaker cable to the spring terminals on the side of the back box, first looping the cable around the strain relief bar. A second person will be required to hold the back box while the cable is connected. The diagram above illustrates the cable connection.
Ensure that the speaker connection polarity is correct: the cable connected to the positive terminal on the amplifier should be connected to the red spring terminal on the back box. Similarly, the cable connected to the negative terminal on the amplifier should be connected to the black spring terminal on the back box.
Note: If an amplifier is already connected to the cable it should be switched off while connections are being made to the back box.
4.5With the back box connected it may be lifted up into the ceiling aperture. Correct back box orientation must be established at this stage: the red arrow on the back box flange should be pointing towards the listening area.
Ensure that the clamps are retracted so that they will pass through the aperture then lift the back box up so that the flange is flush on the ceiling. Take care that the cable is not trapped. One person should hold the back box in place while a second tightens the eight clamp screws. The diagram above illustrates insertion of the back box.
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