User manual B&W AS2

[. . . ] However, if something does go wrong with this product, B&W Loudspeakers and its national distributors warrant free of charge labour (exclusion may apply) and replacement parts in any country served by an official B&W distributor. This limited warranty is valid for a period of five years from the date of purchase or two years for electronics including amplified loudspeakers. You can call B&W in the UK or visit our web site to get the contact details of your local distributor. To validate your warranty, you will need to produce this warranty booklet completed and stamped by your dealer on the date of purchase. [. . . ] All sound installations require some planning and experimentation if you are to get the best out of the products used and this manual will guide you in this process. As the subwoofer is connected to the electricity power supply, it is important that you familiarise yourself with the safety instructions and heed all warnings. What the subwoofer does application: Home Theatre The primary function of the subwoofer is to reproduce signals from the Low Frequency Effects (LFE) channel. In addition, the processor may be configured to divert the low bass portion of some or all of the other channels and add it to the LFE information by configuring those speakers to `small' in the processor set-up procedure. Application: 2-channel audio The subwoofer is used to extend the bass response beyond that provided by the satellite speakers. In most cases, best results are obtained if the satellite speakers are run full range as normal directly from the power amplifier. The subwoofer lowpass filter is then set so that its output rises as that of the satellite speakers falls naturally. Positioning the subwoofer Because the subwoofer produces only lowfrequency sounds, positioning is less critical in some respects compared to full-range speakers. Directional information is much less precise and you have more choice where to place the speakers to good effect. This said, best results are obtained if the subwoofer is placed between the left and right speakers or in the vicinity of one of If you use two subwoofers, it is best to put one near the left and one near the right speaker. Placing the subwoofer behind the listeners, even in surround sound installations, generally gives inferior imaging, but may be an acceptable compromise if domestic considerations dictate. As with all speakers, the proximity of room boundaries affects the sound. Bass is generally increased as more surfaces come into close proximity with the speakers. Unlike full-range speakers, however, you can always restore the correct overall system balance by adjusting the volume level of the subwoofer. The more boost you get from the room, the less hard the speaker has to work; but there is a down side. If the subwoofers cannot be placed close to the main speakers, better results may be obtained by feeding the left and right channels to both subwoofers, connecting both subwoofers as shown in figure 5 and described above in the section "Using one subwoofer". We recommend that you switch the subwoofer on after any equipment feeding signals to it. The MODE standby/auto/on switch (7) does not isolate the amplifier completely from the power supply. The switch (7) operates as follows: O On: With the switch in this position, the amplifier remains permanently on, and the light glows green. A Auto: On first switching the subwoofer to Auto, the amplifier goes into standby mode, and the light glows red. When an input signal is detected, the amplifier automatically becomes fully active and the light glows green. After a period of about 5 minutes without an input signal, the amplifier automatically reverts to standby mode and the light glows red. [. . . ] If you alter the relative distances from the subwoofer(s) and satellite speakers to the listeners appreciably, reassess the phase switch setting. You should also check the level setting of the subwoofer (using either the processor output levels or the volume control on the subwoofer amplifier as appropriate), but only after setting the phase correctly. When using more than one subwoofer, ensure that each one has its low-pass filter frequency and PHASE set the same way. Taking care of the subwoofer The cabinet of the subwoofer may be cleaned by dusting with a dry cloth. [. . . ]