User manual B&W DS7

[. . . ] Indeed, you may even change the characteristic for different types of programme and, as the total energy into the room is the same in both modes, no recalibration of the installation is necessary when switching between them. In dipole mode, the front tweeter is disconnected; the two side firing drivers are brought into operation and the crossover frequency to the bass unit is lowered. The side units are connected out of phase with one another, which creates a wedge-shaped null zone at right angles to the wall. If the listeners sit within this zone, they become less aware of the location of the speakers and hear more reflected sound; hence the diffuse nature of the sound field. [. . . ] This enables better location of side and rear images, although the formation of such images is never quite as precise as it is between the front speakers. Most films are originally balanced for cinemas, where a large number of speakers spread around the auditorium are used to create the surround sound field. In that case there are more surround speakers than there are discrete channels of information and a less precise image is created that gives an all-enveloping effect. Dipoles and similar diffuse speakers are better at recreating this type of sound field in the home, but using fewer speakers to do it. Image positioning with these types of speaker is never as precise as it can be with monopoles. However, they do have the 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 the B&W national distributor in the country of residence who will You can choose which way the positive and negative dipole lobes point using the centre toggle switch marked t on the front 8 baffle. To optimise the smoothness of sounds panning from the front of the room to the back and vice versa when speakers are used in dipole mode, we recommend that the side speakers have their positive lobes pointing towards the front of the room and the rear speakers have their positive lobes pointing towards the centre of the rear wall. (figure 7) Ensure, especially when fixing to drywall panels, that the screw length and wall plug security are sufficient to hold the weight of the speaker. B&W can accept no liability for any failure of wall or ceiling fixings. the outside dimensions of the template correspond to the rear of the cabinet. Stick 4 of the clear self-adhesive rubber pads to the rear panel of each speaker, one close to each corner. These stop the speaker vibrating against the surface and help keep it in position. (figure 8) Adjust the protrusion of the screws such that the rubber pads are a friction slide on the surface when the wall plates are hooked over the screw heads. (figure 9) Always check and ensure that: · All the screws slide right to the ends of the slots in the wall plates. Screw protrusion is adjusted so that the rubber pads provide enough friction to prevent the speakers sliding out of position. Conversely, the ­ position reduces the level for when the room acoustic is too bright or if you want to reduce your awareness of the speakers' location. The performance of the speaker will change subtly during the initial listening period. If the speaker has been stored in a cold environment, the damping compounds and suspension materials of the drive units will take some time to recover their correct mechanical properties. The drive unit suspensions will also loosen up during the first hours of use. The time taken for the speaker to achieve its intended performance will vary depending on previous storage conditions and how it is used. As a guide, allow up to a week for the temperature effects to stabilise and 15 hours of average use for the mechanical parts to attain their intended design characteristics. [. . . ] Use the bottom switch on the front baffle when selecting between monopole and dipole modes. In the GG position the speaker is always in dipole mode, whatever the trigger signal. Some processors feature programmable triggering and may be set up to change the mode of the speakers depending on the type of material being played. Ask your dealer for advice on choosing a suitable processor if you wish to use this facility and refer to the processor manual on how to carry out the programming. [. . . ]