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Hersteller: Bowers & Wilkins Dateigröße: 3.83 mb Dateiname: Unterrichtssprache:

Angle it towards the listeners if the tweeter is more than 5. from ear height. (figure 5) If you have a normal screen, place the speaker immediately above or below the screen, whichever is nearest ear height. Angle it towards the listeners if the tweeter is more than 5. from ear height. A stand with tilt adjustment is available for the HTM2D, HTM2S and HTM4S. Consult your dealer for details. (figure 6) If you are just listening to audio, place the speakers centrally and mount bookshelf or wall mount speakers with the tweeters at ear height. (figure 7) f Go to section 3. 2.3 SURROUND Surround speakers generally fall into two main types – those that one might describe as 'normal' speakers – so- called monopoles, where the sound comes from a set of drive units mounted on the front of the enclosure – and those that give a more diffuse sound field, such as dipoles. Each type has its advantages. Most multi-channel music is recorded with home entertainment in mind and is monitored using monopole surround speakers, whatever the multi-channel recording format. This enables better location of side and rear images, 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 advantage of making it easier to balance the system for a larger listening area. You 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 by several criteria, some of which may have a degree of conflict. DS8S only Within the 800 series, the DS8S is the only speaker to offer dipole operation. In fact, this specialist surround speaker has the advantage of offering a choice of both monopole and dipole operation, either via a switch located on the front baffle, behind the removable grille, or remotely, using a 12V trigger from the surround processor. You may therefore 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. In monopole mode, only the two drive units on the front face operate. In dipole mode, the front tweeter is disconnected; the side firing drivers are brought into operation and the crossover frequency to the bass unit is lowered. The drive units on opposing sides are connected out of phase with one another, which creates a wedge- shaped null zone, approximately 60. 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. Use the bottom switch on the front baffle when selecting between monopole and dipole modes. In the • position, the speaker defaults to monopole. (figure 8) However, if a 12V signal is applied to the trigger input, internal relays switch to dipole mode. In the •• position, the speaker is always in dipole mode, whatever the trigger signal. (figure 9) Set the direction of the positive and negative dipole lobes using the centre toggle switch marked ’ on the front baffle. The stem of the switch points in the direction of the positive lobe. For the smoothest panning of sounds between all the s...

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