User manual B&W NAUTILUS 804

[. . . ] The acoustic character of the room can have a profound effect on the final sound quality. Please read this manual fully before unpacking and installing the product. It will help you to optimise its performance. B&W maintains a network of dedicated distributors in over 60 countries who will be able to help you should you have any problems your dealer cannot resolve. [. . . ] Although supplied as single units, systems with consecutive serial numbers (odd number lower) have veneer-matched cabinets. Please be aware that if more than two speakers are purchased for a single installation, B&W cannot guarantee they will all be veneer matched. If the links are left in place, may cause damage to the amplifier by shorting its output terminals. Before fine tuning, double check that all the connections in the installation are correct and secure. Moving the speakers further from the walls will reduce the general level of bass. Space behind the speakers also helps to create an impression of depth. Conversely, moving the speakers closer to the walls will increase the level of bass. If the bass is uneven with frequency it is usually due to the excitation of resonance modes in the room. Even small changes in the position of the speakers or the listeners can have a profound effect on how these resonances affect the sound. Try mounting the speakers along a different wall. Even moving large pieces of furniture can have an effect. If the central image is poor, try moving the speakers closer together or toeing them in so they point at or just in front of the listeners. (figure 4) If the sound is too harsh, increase the amount of soft furnishing in the room (for example use heavier curtains), or reduce it if the sound is dull and lifeless. Test for flutter echoes by clapping your hands and listening for rapid repetitions. Reduce them by the use of irregular shaped surfaces such as bookshelves and large pieces of furniture. ensure the speakers stand firmly on the floor. Whenever possible fit the spike feet supplied after you have optimised the positioning. They are designed to pierce through carpeting to the floor surface. Initially, screw the lock nuts fully onto the spikes and screw the spikes fully into the threaded inserts in the base of the speaker. If the cabinet rocks, unscrew the appropriate spikes until the speaker stands firmly on the floor and lock them in place by tightening the lock nuts against the base. If you do not have a carpet, use a protective disc under the spikes to protect the floor surface. For the most discerning listening, remove the cloth covered grille as described below in the section "Aftercare". [. . . ] The grille fabric may be cleaned with a normal clothes brush whilst the grille is detached from the cabinet. The surface of the tweeter housing will benefit from the use of an anti-static cleaner. do not attempt to remove the tweeter grille. Avoid touching the drive unit diaphragms, especially the tweeter, as damage may result. [. . . ]