User manual B&W NAUTILUS 800

[. . . ] In particular, you must regard the listening room as an extension of the speaker. 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. 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. [. . . ] In order to comply with European CENELEC safety regulations, the 4mm holes in the ends of the terminals are blocked by plastic pins. Do not remove the pins if you are using the product where these conditions apply. The outermost (LF) pair feed the bass drivers and the innermost (MF/HF) pair feed the midrange and tweeter. This separation of the inputs to each section of the speaker allows a choice of connection methods. On delivery, both positive and both negative terminals are connected together with highquality links for use with single 2-core cable. If you wish to use single cable connection, the links must be left in place. Because high frequency signals are more readily degraded by contact connections, we recommend you connect the cable directly to the innermost (MF/HF) terminals (figure 3a). Even if you finally intend to use a more complex connection method, single cable connection aids free movement of the speakers during initial setting up. Separation of the signal paths to each section of the speaker can improve imaging and the resolution of low-level detail and allows the user to optimise the cable to the frequency range of use. Bi-wiring involves the use of two separate 2-core cables from the same amplifier, one to each pair of terminals on the speaker. Bi-amplification involves the use of two separate power amplifier channels for each speaker. In both cases, the links should be removed from the speaker terminals (figure 3b). ensure each positive terminal on the speaker (coloured red) is connected to the positive output terminal of the amplifier and negative (coloured black) to negative. Incorrect connection may result in impairment of frequency response, poor imaging and loss of bass. If using bi-amplification, ensure that each amplifier channel has the same gain, otherwise you will change the balance of the speaker. Some amplifiers invert the signal, and a mixture of different types may cause a dip in the overall response. If you have a mixture of inverting and non-inverting amplifiers, reverse the polarity of the connections from any inverting amplifier to the speaker. Bear in mind that, even though midrange and, even more so, tweeter drivers can (and only need to) handle less continuous power than bass drivers, the amplifier feeding them needs to have an adequate voltage swing in order to Before fine tuning, double check that all the connections in the installation are correct and secure. Positioning the speakers: 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. [. . . ] The leather cleaner supplied in the accessory pack will maintain the quality of the leather on your speakers for many years. If you wish to use it on other leather, we advise you test it first on an unobtrusive area of the article, DO NOT USE THIS PRODUCT ON ANILINE (UNFINISHED) LEATHER. Immerse a soft cloth in this solution, wring out cloth and rub lightly over the surface to be cleaned. Remove an residue of cleaner solution with a fresh cloth dampened with clean water. [. . . ]