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he lightning flash with arrowhead
symbol within an equilateral triangle, is
ntended to alert the user to the
presence of uninsulated “dangerous
oltage” within the product's enclosure
hat may be of sufficient magnitude to
constitute a risk of electric shock to
he exclamation point within an
equilateral triangle is intended to alert
the user to the presence of important
perating and maintenance (servicing)
instructions in the literature
accompanying the product.
ARNING: To reduce the risk of fire or electric
shock, do not expose this apparatus to rain or
Do not expose the device to rain, use it near water or
in damp or wet conditions, or place containers on it
containing liquids which might spill into any openings.
When setting up the device, make sure that the AC
outlet you are using is easily accessible. If some
trouble or malfunction occurs, immediately turn off the
power switch and disconnect the plug from the outlet.
Even when the power switch is turned off, electricity is
still flowing to the product at the minimum level. When
you are not using the device for a long time, make
sure to unplug the power cord from the wall AC outlet.
Thank you for choosing Bowers & Wilkins. 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.
All B&W products are designed to comply
with international directives on the
Restriction of Hazardous Substances
(RoHS) in electrical and electronic equipment and the
disposal of Waste Electrical and Electronic Equipment
(WEEE). These symbols indicate compliance and that
the products must be appropriately recycled or
processed in accordance with these directives. Consult
your local waste disposal authority for guidance.
Check in the carton for:
1 Mains cable
1 Accessory pack containing:
4 M6 spike feet
4 M6 rubber feet
4 Lock nuts (10mm acr
The subwoofer has been designed both for Home
Theatre installations and to augment the bass
performance of ‘full range’ speakers in 2-channel
audio systems. All audio installations require some
hought in installation if they are to reach their full
performance potential and this manual will guide you
hrough the process.
he subwoofer requires connection to the mains
power supply, so it is important that you familiarise
ourself with the safety instructions and heed all the
arnings. Keep this manual in a safe place for future
The Subwoofer Connection and Control
1. Status indicator.
2. On, Auto, Stand-by switch.
3. Line-level input volume.
4. Speaker level input volume.
5. Low-pass filter frequency.
6. Low-pass filter selection switch.
7. Bass extension switch.
8. Equalisation switch.
9. Phase reverse switch.
10. 12V trigger input.
11. Line level input sockets (left and right).
12. Speaker level input binding posts (left and right).
13. Mains input.
14. External fuse holder.
The primary function of a subwoofer is to reproduce
signals from an audio-visual processor Low Frequency
Effects (LFE) channel. In addition, the processor may
be configured to divert the low bass portion from
some or all of the other channels and add it to the LFE
information. This is usually done by selecting “small”
loudspeakers in the processor set-up procedure.
In 2-channel audio applications a subwoofer is used to
extend the bass response lower than that provided by
the satellite speakers. The subwoofer low-pass filter
should be set so that the subwoofer takes over as the
output of the satellite speakers falls.
Subwoofer Positioning and Installation
The ear poorly perceives the source location of low
frequency sound so the position of subwoofers in the
listening room is generally less critical compared to
full-range speakers. However, best results are usually
obtained if the subwoofer is placed between the left
and right speakers or in the vicinity of one of them. If
two subwoofers are used, it is best to put one near
the left and one near the right speaker
. Placing a
subwoofer behind the listening position, even in multi-
channel surround sound installations, generally results
in inferior imaging, but may be an acceptable
omise if domestic considerations dictate.
As with all speakers, the proximity of room boundaries
affects the sound of a subwoofer. Bass volume
eases as mor
e surfaces come into close pr
with the speaker
. Unlike full-range speakers, however,
the overall system balance can be corrected by
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