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use
crossover
control *
T 1.5A L 250V
C
AUTION: Disconnect supply cord
b
efore replacing fuse. For continued
protection against risk of fire, replace only
with same type fuse.
ATTENTION: Debrancher avant de
remplacer le fusible. Utiliser un fusible de
rechange de même type.
1
20V ~ 60Hz 1.25A
bypass
crossover
control **
75
1
00 125
150
* use crossover control: removes high
frequencies; use with sources lacking suitable
filtering (most products without Dolby Digital
or THX), or where manual control is desired.
crossover (Hz)
power
0º
180 º
polarity
left right
s
peaker level in
Powered Subwoofer
Featuring BassTrac
®
line level in
** bypass crossover control: direct to woofer;
use with sources having built-in crossover
controls or bass management (most products
with Dolby Digital or THX).
C US
XB4
CAUTION
R
ISK OF ELECTRIC SHOCK
DO NO T OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR
6
Controls
Volume (on top panel): Adjusts the sound level of the subwoofer. A typical setting is around
11 o’clock.
Crossover (Hz): Adjusts the frequency of the lowpass filter for the
subwoofer. This control is inactive when using the “bypass crossover
control” input jack.
Polarity (0° or 180°): Selects regular (0°) or inverted (180°) polarity for the subwoofer.
Set this switch to pr
ovide the fullest, most dynamic bass. The effect of phase will be
most audible on low-frequency percussion instruments or music with a continuously
repeating bass line.
Power light and power status: The power light turns on whenever the XB4 is plugged into an
electrical outlet. The XB4’s auto-on circuitry turns the subwoofer on when a signal is presented, and
turns it off if no signal is detected. NOTE: Power is always supplied to the subwoofer electronics
unless it is unplugged. The auto-on cir
cuitr
y only activates or deactivates the power amplifier
.
Connecting the Subwoofer to Stereo or Dolby
®
Pro Logic
®
Systems
For stereo or Dolby Pro Logic systems, the easiest method is to use the same speaker wire connections as shown on page 5.
You may also use the “sub out” connection from your receiver to the input on the subwoofer marked
use crossover control.
When using speaker wire or the use “crossover control” input, the subwoofer’s built-in crossover is engaged. As a starting
point, set the crossover control on the subwoofer about 10Hz higher than the lower limit of your main speakers’ bass response
(for Boston Acoustics front speakers, refer to the included “Optimal Crossover Settings...”sheet). Fine-tune the crossover set-
ting by ear for the smoothest blend with your main speakers. The best setting of the crossover control will depend on speak-
er placement and personal preference.
75
100 125
150
crossover (Hz)
0º
180 º
polarity
power
back of receiver
subwoofer out