Bowers & Wilkins SA250 Mk2, Custom Installation

Page: 10 / 39

ENGLISH
10
Home Theatre
Set the LOW-PASS FILTER switch (4) to Off.
The setting of the FREQUENCY (5) control is now irrelevant.
Set the BASS EXTENSION switch (6) initially to A.
Set the EQUALISATION switch (7) to Movies.
Set the PHASE switch (8) initially to 0.
Set the VOLUME control (9) initially to the 9 o’clock position.
See the Fine Tuning section for more.
The subwoofer and subwoofer amplifier are not THX®
licensed components, but may be used with a THX®
controller if desired. If a THX® controller is used, ensure
that the subwoofer function is enabled. This incorporates
all the filtering and level setting required for the subwoofer
in all modes. For level calibration, the internal test noise and
channel level controls in the THX® controller should be used.
In all cases the levels should be set to obtain 75dB SPL
(C-weighted) at the listening position from the controller’s
internal noise test signal.
With other processors, configure the front and surround
speakers to “large” or “small” as appropriate before setting
the levels. Use the internal noise test signal and volume
controls of the processor to set the levels of all the speakers.
Only change the VOLUME control on the subwoofer amplifier
if there is not enough range in the processor to achieve the
correct levels. Inexpensive sound level meters are readily
available from electronics stores and can be used to calibrate
the levels. Refer to your processor manual for further details
on how to set the levels.
On the Rear Panel
Subwoofer Equalisation
Set the subwoofer switch (5) on the rear panel to the
appropriate model.
On the Front Panel
Switching On and Off
The subwoofer amplifier is best switched on after any other
items and switched off first. The Standby/Auto/On switch (3)
operates as follows:
Standby: The subwoofer amplifier will become active when
12V is applied to its STANDBY TRIGGER input.
When 0V is applied to the trigger, the subwoofer
amplifier will return to the Standby state. The
indicator will glow green when the subwoofer
amplifier is active and red when the subwoofer
amplifier is in Standby.
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 go to the
Standby state, when 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 Standby after about 5
minutes with no input signal. Some audio-visual
processors incorporating an automatic set up
procedure may be confused by a subwoofer
amplifier with an auto On/Standby function and
a potentially damaging fault condition may arise.
The subwoofer amplifier is best left switched on
and fully active during set up if such a processor
is used.
On: The subwoofer amplifier will remain fully active
and the indicator will glow green.
6. Setting the controls
ISW-3 ISW-4
4
1 2 8
3 5
7
6