Évaluations - 5, GPA: 4.2
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Facilité d'utilisation
The crossed wheelie bin symbol indicates compliance and that the products must be appropriately recycled or processed in accordance with these directives. Carton Contents Check in the carton for: 1 Foam plug. 4 Self-adhesive rubber pads. Positioning If using a projection television with an acoustically transparent screen, place the speaker behind the centre of the screen. Otherwise position it directly above or below the screen, whichever is closest to ear level. Align the front of the speaker approximately level with the screen. The speaker is best used mounted on a rigid shelf or wall bracket or on a rigid floor stand. The B&W FS-700/CM stand is recommended. If the speaker is to be placed either directly on top of a television or in a rack shared with other AV equipment, fix the 4 self-adhesive pads to the base of the speaker. They provide a degree of vibration isolation. The flat area on top of the television may be smaller than the base of the speaker, so position the feet accordingly. Stray Magnetic Fields The speaker drive units are magnetically shielded such that the stray magnetic field outside the boundaries of the cabinet, except the front, is too low to cause distortion of the television picture in the vast majority of cases. There are, however, some extremely sensitive televisions – some that even have to be adjusted according to their alignment with the earth’s magnetic field. If you have a problem, first de-magnetise the television set with the speaker in place. Some have a button especially for this purpose. If such feature is fitted, switch off the set at the mains for 15 minutes and switch on again – again with the speaker in place. Merely putting the set into standby mode will not be sufficient. If you still have a problem, try moving the speaker either forwards or backwards a little to get a more favourable alignment, or space the speaker further from the television until the distortion disappears. Because of the higher magnetic field in front of the speakers, magnetically sensitive articles (computer discs, audio and video tapes, swipe cards, etc) should be kept at least 0.2m from the speaker. Connections All connections should be made with the equipment switched off. There are 2 linked pairs of terminals on the back of the speaker. For conventional connection, the terminal links should remain in place (as delivered) and just one pair of terminals connected to the amplifier. For bi-wire connection, the terminal links should be removed and each pair of terminals connected to the amplifier independently. Bi-wiring can improve the resolution of low-level detail. Figures 1a and 1b illustrate conventional and bi-wire connection. Ensure that the positive terminals on the speaker (marked + and coloured red) are connected to the positive output terminal on the amplifier and the negative terminals on the speaker (marked – and coloured black) are connected to the negative output terminal on the amplifier. Incorrect connection can result in poor imaging and loss of bass. Ask your dealer for advice when selecting speaker cable. Keep its total impedance below the maximum recommended in the speaker specification and use a low inductance cable to avoid attenuation of high frequencies. Fine Tuning Before fine tuning, make sure that all the connections in the installation are correct and secure. For greatest realism in home theatre installations, it is important to balance the speakers and adjust the acoustic image to match the size of the screen. With smaller screens, it may be more realistic to have the left and right speakers closer together than you might for audio alone. Adjust the levels of the three front speakers to get a smooth transition of sounds as they pan across the screen. Adjust the level of the surround speakers so that, except for special effects, your attention is not unduly attracted to them. Listen from a variety of probable listening positions when deciding on the optimum levels. Moving the speaker further from the wall will generally reduce the volume of bass. Conversely, moving the speaker closer to the walls will increase the volume of bass. If you want to reduce the volume of bass without moving the speaker further from the wall, fit the foam plug in the port tube as illustrated in Figure 2. If the bass seems uneven with frequency, this will most probably be due to resonance modes in the listening room. Even small changes in the position of the speakers or the listening position can have a profound effect on how these resonances affect the sound. Try moving the listening position a little backwards or forwards. The presence and position of large pieces of furniture can also influence resonant modes. If the sound is too bright, increasing the amount of soft furnishing in the room (heavier curtains for example) may help balance the sound. Conversely, reducing the amount of soft furnishing may help brighten a dull sound. Some rooms suffer from "flutter echoes" – echoes that "bounce...