Bowers & Wilkins ASW608 Manuel D'utilisation page 13

the floor beneath. Screw the spikes fully into the
threaded inserts in the base of the cabinet. If the
cabinet rocks when placed on the floor, unscrew the
two spikes that do not touch the floor until the cabinet
rests firmly without rocking. Finally, lock the nuts
against the cabinet. It may be more convenient to fit
and adjust the spike feet after speaker positioning has
been optimised.
If there is no carpet and you wish to avoid scratching
the floor surface, use either a protective metal disc (a
coin perhaps) between the spike and the floor or use
the supplied rubber feet. Fit the rubber feet by
screwing one into each of the holes in the underside
of the cabinet.
The grille fitted to the front of the subwoofer may be
removed if desired. Take care however not to touch
the moving parts of the drive unit as damage may
result.
Using Multiple Subwoofers
Using multiple subwoofers in a single installation can
improve performance in the following ways:
• Maintain stereo separation to the lowest
frequencies.
• Smooth out the effects of low frequency room
resonances.
• Enable a higher maximum sound output.
In the case of two subwoofers used in a
2-channel audio system, stereo separation will only be
improved if each channel has its own subwoofer
located close to the appropriate satellite speaker.
Electrical Connections
Disconnect all audio system equipment from the mains
until the signal connections have been made and
checked. This avoids the risk of damage whilst
connections are made or broken. The subwoofer can
accept both line level signals via the RCA Phono
sockets (Item 11 in Figure 1) and speaker level signals
via the binding posts (Item 12 in Figure 1). Use the
following guide to select the appropriate connection
method for your installation:
Application: Home Theatre
Subwoofer connected to AV Processor with separate
power amplifiers: Figure 2
Subwoofer connected to AV Processor with integrated
power amplifiers:
• using line-level inputs: Figure 3
• using speaker level inputs: Figure 4
Note: The subwoofer is always better connected via
its line level inputs in home theatre applications.
Application: 2-channel audio
Subwoofer connected to Integrated Amplifier:
• using line-level inputs: Figure 5
• using speaker level inputs: Figure 6
Two Subwoofers connected to Integrated Amplifier:
• using line-level inputs: Figure 7
12
• using speaker level inputs: Figure 8
Subwoofer connected to Pre/Power Amplifier:
• using line-level input: Figure 9
• using speaker level inputs: Figure 10
Two Subwoofers connected to Pre/Power Amplifier:
• using line-level inputs: Figure 11
• using speaker level inputs: Figure 12
Before Auditioning
Before auditioning your new subwoofer installation and
fine-tuning it, double check the connections. Make
sure in particular that:
1. The phasing is correct. If the speaker level inputs
are used, ensure that the positive terminals on the
subwoofer (marked + and coloured red) are
connected to the positive output terminals on the
amplifier and that the negative terminals on the
subwoofer (marked – and coloured black) are
connected to the negative output terminals on the
amplifier. Incorrect connection can result in a
confused sound with poor bass.
2. Left and right channels are not interchanged.
Left/right confusion can result for example in
orchestral elements appearing in the wrong place
in the stereo image, or Home Theatre sound
effects not matching the action on screen.
Switching On and Off
Subwoofers are best switched on after any other item
and switched off first. The On/Auto/Standby switch
(Item 2 in Figure 1) and Status Indicator (Item 1 in
Figure 1) operate as follows:
On: With the switch to On, the subwoofer will remain
fully active and the indicator will glow green.
Auto: With the switch set to Auto, the subwoofer will
initially become fully active and the indicator will glow
green. After about 5 minutes without an input signal,
the subwoofer will automatically enter "sleep" mode.
The indicator will glow red. When an input signal is
detected, the subwoofer will automatically become
active and the indicator will glow green. The
subwoofer will return to sleep after about 5 minutes
with no input signal.
Audio-visual processors incorporating an "automatic"
set up procedure may be "confused" by subwoofers
with an auto switch-on/sleep function. A potentially
damaging fault condition can arise. Subwoofers are
best left switched on and fully active during set up if
such a processor is used.
Standby: With the switch set to Standby the
subwoofer will become active when 12V is applied to
the Trigger Input (Item 10 in Figure 1). Zero volts at the
input will return the subwoofer to sleep. The indicator
will glow green when the subwoofer is active and red
when the subwoofer is in sleep.
Setting The Subwoofer Controls
There are 7 controls to consider:
• The VOLUME (LINE) control (Item 3 in Figure 1)