4
1. AC LINE CORD
2. POWER SWITCH
Automatic on/off
3. SETTING OF CONTROLS
Your hearing is the final arbiter of
correct settings.
Acoustic feedback
Since the subwoofer contains its own
amplifier, it must be connected to a mains
outlet. Two versions of B1-19/B1-30
subwoofer model are manufactured, one
for 110-120V and another for 220-240V
operation. Check the manufacturer's
labels to make sure that the correct
model has been supplied.
Plug the AC
line cord into a switched outlet on your
amplifier or into any AC wall outlet that
provides the correct line voltage.
The subwoofer can be turned on or
completely switched off by pushing the
rocker type power switch on the panel.
The white lettering "1" on the power
switch indicates power ON position and
"0" indicates power OFF position.
Since the subwoofer is equipped with an
automatic on/off facility, turning the
system on every time it is to be used is
avoided. When the system is connected
to the mains, an amber LED indicates
STAND-BY status. In the presence of an
audio signal with a level more than 5mV
the system is automatically switched on
as shown by a green LED. If there is no
signal or a signal less than 5mV for five
minutes, the system automatically shuts
off.
T h i s
s u b w o o f e r
i s
d e s i g n e d
f o r
continuous STAND-BY operation, and
then draws negligible power. If the system
is not to be used for a long period of time,
such as a vacation trip, disconnect the
system by pushing the power switch to off
position or removing the mains plug to
completely separate the subwoofer from
the mains.
In theory, the best position for the
subwoofer is midway between the
satellite speakers, with its front facing
forward and in the same place as the
fronts of the satellite speakers. The
subwoofer, B1-19 or B1-30 may, however,
due to the very low harmonic distortion, in
practice be moved quite far from this
position without any detrimental effect on
the sound reproduction as the subwoofer
frequencies are not directionally.
There are three control knobs on the rear
of the subwoofer. These controls make it
possible to match the low bass
frequencies from the subwoofer to the
bass
midrange
treble sound of any
good satellite stereo speakers for
optimum sound, and at the same time to
compensate for room-effects and different
positions of the subwoofer.
The adjustments can be optimized
without the aid of any tools except ear
and good quality music records. Before
your making final adjustments, make sure
your basic stereo system is in good
working order.
Since the subwoofer can produce a
considerable output level at low
frequencies, acoustic feedback via the
turntable can occur. To ensure that this is
not the case, perform the following test at
installation of the subwoofer, if it is
possible.
Set up the equipment with record playing.
Place the pick-up on a non-rotating
record (disconnect the turntable power
cord if necessary). Tap the turntable while
gradually increasing the volume control. If
there is a shift in the sound character
from the loudspeakers (towards sustained
sound) before the volume control has
been advanced to a setting that
represents loud listening, acoustic
feedback is a problem. Moving the
turntable or the speakers may remedy
this problem. Or try placing an anti-
vibration pad under the turntable.
REAR PANEL CONNECTIONS AND CONTROLS
