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Bowers & Wilkins ASW608 [14/78] Channel audio settings

• The VOLUME (SPEAKER) control (Item 4 in Figure 1)

• The LOW-PASS FREQ (frequency) control (Item 5

in Figure 1)

• The LOW-PASS FILTER switch (Item 6 in Figure 1)

Note: This applies only to the LINE input. The filter

is always in circuit with the SPEAKER LEVEL input.

• The BASS Extension switch (Item 7 in Figure 1)

• The EQ (equalisation) switch (Item 8 in Figure 1)

• The PHASE switch (Item 9 in Figure 1)

The appropriate settings depend on the equipment

used with the subwoofer and the modes of

connection. If using more than one subwoofer, ensure

the controls on each one are set the same.

Note: The VOLUME (LINE) and VOLUME (SPEAKER)

controls only operate on their respective line and volume

inputs. An unused volume control is best set to Min.

Home Theatre Settings

Set the VOLUME (LINE or SPEAKER) control initially to

the 9 o’clock position.

Set the LOW-PASS FILTER switch to OUT.

Set the EQ switch initially to position A.

Set the PHASE switch initially to 0°.

Set the LOW-PASS FREQ (frequency) control to 140 if

the speaker level inputs are used. The setting is

irrelevant if the line level inputs are used.

See the “Fine Tuning” section for more.

The subwoofer is not a THX

licensed component, 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 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.

2-channel Audio Settings

Set the VOLUME (LINE or SPEAKER) control initially to

the 9 o’clock position.

Set the LOW-PASS FILTER switch to IN.

Set the EQ switch initially to position A.

Set the PHASE switch initially to 0°.

Set the LOW-PASS FREQ control 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 B&W speaker

model. If the satellite speaker manufacturer quotes

only a -3dB frequency, the optimum setting for the

LOW-PASS FREQ 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.

See the Fine Tuning section for more.

Fine-tuning

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 LOW-PASS

FILTER is switched out (or set to maximum), because

the processor provides all the filtering for any speakers

set to “small”. 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.

2-channel Audio

Set the system up in the preferred position and play

some programme with a steady bass content.

The optimum settings of the PHASE switch and the

LOW-PASS FREQ 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 LOW PASS FREQ 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 (LINE or SPEAKER) of the

subwoofer 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.

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Bowers & Wilkins ASW608 [14/78] Channel audio settings

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