Channel Audio - Bowers & Wilkins SA250 Mk2 Custom Installation

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2-channel Audio

Set the LOW-PASS FILTER switch (4) to On.
Set the FREQUENCY control (5) to match the -6dB low
frequency cut-off frequency of the satellite speakers.
Note: Both -3dB and -6dB figures can be found in the
specification of each Bowers & Wilkins speaker model. If the
satellite speaker manufacturer quotes only a -3dB frequency,
the optimum setting for the FREQUENCY control should be
between 0.6 and 0.9 times that figure. The more gradual the
low frequency roll-off of the satellite speakers, the lower the
frequency should be set.
Set the BASS EXTENSION switch (6) initially to position A.
Set the EQUALISATION switch (7) to Music.
Set the PHASE switch (8) initially to 180.
Set the VOLUME control (9) initially to the 9 o'clock position.
See the Fine Tuning section for more.
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7. Fine Tuning
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Before fine tuning, make sure that all the connections in the
installation are correct and secure.
Home Theatre
In home theatre systems, the subwoofer (LFE) signal is a
separate channel rather than an extension of the signal to
the satellite speakers. The subwoofer's LOW-PASS FILTER
should be switched to Off because the processor provides
all necessary filtering. However, the position of the PHASE
switch must still be assessed. Normally the phase will be
set to 0, but if the subwoofer is positioned at a distance
significantly different from the other speakers, or the power
amplifier driving the other speakers happens to invert the
signal, the 180 position may be preferable. Listen with the
switch in both positions and choose the one that gives the
fullest sound. If there is little difference, leave the switch at 0.
Surround sound processors normally have a calibrated noise
signal that can be used to set the relative levels of all the
speakers, making the task somewhat more straightforward
than for 2-channel audio. However, do not be afraid to alter
the settings to your personal preference. It is all too easy
to get carried away with the capabilities of the subwoofer,
especially with some special low-frequency effects. Often a
more realistic portrayal, and one more satisfying in the long
term, is to be had by setting the subwoofer level lower than
the standard calibration level.
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