Bowers & Wilkins DB1 - Manual (Page 10)

10
ENGLISH
6.3. DB1 Audio Setup
It will help to have audio playing through the DB1 and
associated system while undertaking the audio setup
procedure.
Selecting Audio from the DB1 setup Home Menu will
display the menu illustrated above.
The four menu items provide the following functions:
Room EQ
Enables any room correction equalisation produced
following in-room response analysis by the SubApp™
PC application to be applied. The default equalisation
curve is flat, so if either no equalisation curve has
been uploaded to the DB1, or a valid curve has been
uploaded, select
In. Only select Out if a previously
uploaded curve is invalidated by the DB1’s position in
the room having been changed. The default is
In.
Inputs
Enables the
Sensitivity, Gain and Polarity of the
Mono (balanced and unbalanced) and Stereo inputs
to be configured. If only one input is connected in your
installation it is not necessary to configure both.
Setting the Sensitivity
Separate adjustment for Sensitivity and Gain
enables the DB1’s signal to noise performance
to be optimised. Set the Sensitivity first to reflect
the specified output level of the source electronics
as shown in the following table:
Source Output Level DB1 Sensitivity
0.5V (or less) +6dB
1.0V 0dB
2.0V (or more) -6dB
If the LED on the front panel flashes red on loud
passages, this indicates input overload. If that
happens, select the next lowest sensitivity and
raise the Gain by 6dB to compensate. Most
source equipment has an output level of 1V so the
default is
0dB.
Setting the Gain
Setting the DB1
Gain balances the output level
of the subwoofer with the other speakers in the
system. If your DB1 is to be used in a home
theatre system in which it is connected to the LFE
output of an audio visual processor, the balance
between the DB1 and the other speakers will
be adjusted when the processor’s speaker level
setup procedure is carried out. In this case the
DB1
Gain should be set at 0dB. The default is
0dB.
For a DB1 used to enhance the low frequency
performance of conventional stereo speakers,
the
Gain parameter must be set by ear. In this
application, you will need to configure a Low-
Pass filter to avoid response overlap between the
DB1 and your main speakers. You should do this
before assessing the correct gain level. See the
Low-Pass section below.
The default Gain is 0dB and you should use this
as the starting point. Once the DB1 is working,
listen carefully to a variety of music program
material and adjust the setting if necessary. It is
important to listen to a variety of music because
a
Gain setting that sounds correct on one
piece may sound either too loud or too quiet on
another. Listen at a realistic volume level as the
perception of musical balance varies with volume
level. The aim is to find a
Gain setting appropriate
to the majority of material.
Note: Remember that it is always possible
temporarily to adjust the DB1 volume using the
Volume Trim function.
Note: If it proves difficult to find the appropriate
subwoofer/main speaker balance adjusting the
low-pass filter phase may be beneficial.
Selecting the Polarity
The DB1 signal
Polarity may be selected
independently for each input. In the majority
of cases the polarity should be set to
Normal.
However, if the power amplifiers feeding the main
speakers invert the signal, select
Inverted. The
default is Normal.
Audio
Room EQ
In
Inputs
Low-Pass
Presets