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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 advantage of making it easier to balance the system for a larger listening area. may well receive conflicting advice from different sources on the best type of surround speaker to use. The truth is that there is no one perfect solution for all situations and the final choice for any given application will be influenced The CT8 DS is a specialist surround speaker and has the advantage of offering a choice of both monopole and dipole operation. The mode of operation is set by a relay inside the speaker, the state of which is controlled from the CT8 XO crossover/equaliser assigned to the speaker via a cable connecting the 3.5mm sockets on both products. If this cable is not fitted, the speaker will only operate in monopole mode. On the CT8 XO is a switch used to select the mode. In the monopole position, this switch may be overridden by a 12V trigger signal from the surround processor. Some surround processors can recognise the type of programme being played from a code on the disc and allow you to assign a 12V trigger to this code. Some other processors allow you to assign a 12V trigger to the input selection and you may, for example, use a different disc player for audio and movies and set the trigger accordingly. In both these cases, you may choose whichever type of operation best suits the conditions of the listening room, the size of audience and the type of programme being played. 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. The two bass drivers operate in both modes. In monopole mode, they cross over to the midrange and tweeter drive units on the front face and the speaker is acoustically similar to the CT8 LR, but without the swivelling head. In dipole mode, the bass drivers cross over to the six side-firing drivers. The drive units on opposing sides are connected out of phase with one another, which creates a wedge-shaped null zone, approximately 60o wide, 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. (figure 5) Figure 6 Figure 6 Mounting the speakers For optimum performance, it is important that the speakers are firmly and securely mounted. All the speakers may be mounted directly at floor level, but, as mentioned above, it can be beneficial to raise the position of the surround speakers and, if the screen is high, it may also be beneficial to do the same with the front speakers. In that case, the supporting structure for the speakers should be substantial. If constructed of wooden studding, the framework should be arranged to be directly beneath the feet of the speaker. (figure 6) All the speakers are equipped with roller glides on the base panel. These allow the speakers to be easily pushed into place in custom furniture. In order to position the speakers accurately, we suggest you create circular recesses 15mm (5/8 in) diameter in the support surface to locate the glides. To avoid rocking when the speakers are in position, it is important that these recesses are accurately positioned and a foot-positioning template is supplied for this purpose. The shaded area at the front of the template is to allow clearance for the movement of the bass cones. For the CT8 DS, the side-firing drive units require free acoustic access into the listening room, indicated by the shaded area of the template extending round the sides. The CT8 DS will normally have the front half of the cabinet protruding clear into the room. It may, however, be built in to a false pillar, but this must be acoustically transparent at the sides, as well as the front, as indicated by the shaded area. If the speakers are to be inset in a false wall, a front template is provided for guidance in cutting the aperture. The template is the same size as the speaker, so remember to leave some clearance. The height of the template includes the roller glides. If the speakers are to be mounted in custom furniture, you should also ensure that it is substantially built and not prone to induced vibration. It should be braced where necessary and it may be beneficial to glue bituminous damping pads, similar to those used in motor vehicles, to large unsupported panels. Such pads need to be thicker on wood than metal and a minimum of 6mm (1.4 in) should be used. If it is desired to remove the roller glides, use the ...