Bowers & Wilkins SA250 Mk2, Custom Installation

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ENGLISH
12
All Applications
The BASS EXTENSION switch offers three options of
subwoofer bass extension. Position A gives the greatest
extension and position C gives the least extension. Position
B provides a compromise setting. If the system is to be
used at very high volume levels or in a large listening room,
restricting the bass extension by selecting either B or C may
help ensure that the subwoofer is not asked to exceed its
performance limits. In most situations the BASS EXTENSION
switch should be left in position A.
The EQUALISATION switch alters the subwoofer bass roll-off
alignment appropriate to Movies or Music listening. The
Movies position gives a “drier” alignment, more suited to the
demands of action movie low frequency effects. The Music
position is suited to a faster more accurate bass line.
The 3.5mm EQUALISATION input on the back panel is
designed to receive a 12V signal that will toggle the Movies/
Music setting at the front panel. Set appropriately, the 12V
trigger output of a processor can automate ideal performance
of the subwoofer.
To use this feature, set the front panel EQUALISATION switch
to Movies. When 12V is applied to the trigger input, the EQ
will change it to Music. When 0V is applied to the trigger
input, the EQ reverts to Movies. Care must be taken in setup
of the processor in order to take advantage of this feature.
2-channel Audio
Set the system up in the preferred position and play some
material with a steady bass content.
The optimum settings of the PHASE switch and the
FREQUENCY control are inter-related and also dependent
on the low-frequency cut-off characteristic of the satellite
speakers. However, the settings recommended above for the
FREQUENCY control and PHASE switch have been chosen
to integrate well with most satellite speaker bass alignments.
Using the initial settings, first check the setting of the PHASE
switch. Choose the option that gives the fullest sound.
Normally the recommended option will be optimum, but
may not be in certain circumstances. These may be that
the power amplifiers feeding the satellite speakers invert
the signal or that the subwoofer is not placed close to the
satellite speakers.
Next, adjust the VOLUME of the subwoofer amplifier relative
to the satellite systems to your liking. Use a wide variety of
programme material to get an average setting. A setting that
sounds impressive on one piece may sound overpowering on
another. Listen at a realistic volume level as the perception of
musical balance varies with sound level.
Finally, adjust the FREQUENCY control to give the smoothest
transition between the subwoofer and satellite speakers.