Connecting The Subwoofer - Bowers & Wilkins Custom Theatre SA1000 Manuel D'installation Et De Configuration

Status Indicator: Illuminates to indicate the amplifier is
switched on.
Fault Indicator: Illuminates to indicate a fault condition.

Connecting the Subwoofer

All connections should be made with the equipment
switched off.
The CT SW10, 12 and 15 have a pair binding post
connection terminals and one Neutrik Speakon
connection socket on their rear panels. The binding
post terminals provide quick and easy connection of
stripped wires while Speakon sockets provide a more
secure and reliable connection method.
If the binding post terminals are to be used, connect
the positive cable to the red terminal and the negative
cable to the black terminal. Incorrect connection can
result in poor imaging and loss of bass. Figure 1
illustrates use of the binding post terminals.
If the Speakon option is to be used, disassemble the
Speakon plug as shown in Figure 2. Connect the
positive cable to the terminal marked +1 and the
negative cable to the terminal marked -1. Incorrect
connection can result in poor imaging and loss of
bass. Once the plug is reassembled it can be inserted
into the socket and locked by twisting clockwise.
Ask your dealer for advice when selecting speaker
cable. Keep its total impedance below the maximum
recommended in the speaker specification and use a
low inductance cable.
Connecting the Subwoofer Amplifier
All connections should be made with the equipment
switched off.
The SA1000 amplifier has two pairs of binding post
connection terminals and one four-pole Neutrik
Speakon connection socket on its rear panel. The
binding post terminals provide quick and easy
connection of stripped wires while Speakon sockets
provide a more secure and reliable connection
method. Two identical subwoofers can be connected
to the amplifier through use of either the two pairs of
binding posts or the supplied four-pole Speakon plug.
If the binding post terminals are to be used, connect
the positive cable or cables to the red terminals and
the negative cable or cables to the black terminals.
Incorrect connection can result in poor imaging and
loss of bass. Figure 3 illustrates the use of the binding
post terminals to connect one or two subwoofers.
If the Speakon option is to be used, disassemble the
Speakon plug as shown in Figure 2 connect the
positive cable to the terminal marked +1 and the
negative cable to the terminal marked -1. Terminals +2
and -2 are to be used when two subwoofers are
connected. Incorrect connection can result in poor
imaging and loss of bass. Once the plug is
reassembled it can be inserted into the socket and
locked by twisting clockwise. Figure 4 illustrates the
use of the Speakon plug to connect one or two
subwoofers.
6
Connect the signal input to the subwoofer amplifier
using either the RCA phono or XLR options. A second
subwoofer amplifier can be daisy-chained from the
first by connecting to either the RCA phono or XLR
output sockets.
Subwoofer Amplifier Setup and Control
Before Auditioning
Before auditioning your new subwoofer installation and
fine-tuning it, double check the connections. Make
sure in particular that the phasing is correct. The
positive terminals on the subwoofer (marked + and
coloured red) should be connected to the positive
output terminals on the amplifier and the negative
terminals on the subwoofer (marked – and coloured
black) connected to the negative output terminals on
the amplifier. Incorrect connection can result a
confused sound with poor bass.
Switching On and Off
The subwoofer amplifier is best switched on after any
other item and switched off first. The On/Auto/Standby
and Status Indicator operate as follows:
On: With the switch set to "On", the subwoofer amplifier
will remain fully active and the indicator will glow green.
Auto: With the switch set to "Auto", the subwoofer
amplifier will initially become fully active and the indicator
will glow green. After about 5 minutes without an input
signal, the subwoofer amplifier will automatically enter
"sleep" mode. The indicator will glow red. When an input
signal is detected, the subwoofer amplifier will
automatically become active and the indicator will glow
green. The subwoofer amplifier 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 a subwoofer
amplifier with an auto switch-on/sleep function. A
potentially damaging fault condition can arise. The
subwoofer amplifier is 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 amplifier will become active when it
receives an appropriate trigger signal via its 12V
Trigger Input. Turning off the 12V signal will return the
subwoofer amplifier to sleep. The indicator will glow
green when the subwoofer amplifier is active and red
when the subwoofer amplifier is in sleep.
Setting The Subwoofer Amplifier Controls
There are 6 controls to consider:
The VOLUME (LINE) control.
The LOW-PASS FREQUENCY control.
The LOW-PASS FILTER switch.
The BASS Extension switch.
The EQUALISATION.
The PHASE switch.
The appropriate settings depend on the equipment
used with the subwoofer and the modes of connection.
If using more than one subwoofer amplifier, ensure the
controls on each one are set the same.