5
Operation
Note:
To prevent switching noise, always switch on
the units connected before switching on the
subwoofer and switch it off first after use.
1) Set the VOLUME control (2) to MIN (left stop) for
the time being and switch on the subwoofer with
the POWER switch (4). The POWER LED (1)
will light up.
2) With the STAND BY switch (10), switch on or off
the automatic standby mode.
Position “AUTO”:
The automatic standby mode is activated. The
subwoofer will automatically be in operation
once an input signal has been applied and the
VOLUME control (2) has been turned up accord-
ingly. The POWER LED (1) will show green. If
the signal level falls below a certain value for a
few minutes, the subwoofer will return to the
standby mode; the POWER LED will show red.
Position “ON”:
The automatic standby mode is deactivated.
After switching on, the subwoofer will always be
in operation. The POWER LED (1) will show
green.
Position “OFF”:
The subwoofer is always in standby mode. The
POWER LED (1) will show red. Thus, it will be
possible to set the subwoofer to the standby
mode immediately, e. g. for testing the switch-on
threshold in the position “AUTO” subsequently.
3) Reproduce sound, e. g. music, via the existing
audio system and add the desired low bass part
with the VOLUME control (2). Only turn up the
control to such an extent that the sound repro-
duced will not be distorted.
4) If the signal source is connected via the inputs
LINE IN (7) or HIGH LEVEL IN (11), adjust the
cutoff frequency of the low pass filter with the
CROSSOVER control (3) so that the subwoofer
will optimally complement the frequency re
-
sponse of the other speakers. This filter will not
affect the input LFE (8).
If required, readjust the volume balance with
the VOLUME control (2).
5) Different distances of speakers to the listener
may result in phase interference (certain fre-
quencies will have a lower volume). To compen-
sate this, the phase of the subwoofer signal is
reversible with the PHASE reversal switch (9).
Test both switch positions to find the position
offering the bass reproduction of the highest vol-
ume at the listening position. Then readjust the
volume balance with the VOLUME control (2), if
required.
6) If the automatic standby mode is deactivated
(
step 2), switch off the subwoofer with the
POWER switch (4) after use.
To prevent unnecessary power consumption,
it is always recommended to switch off the sub-
woofer when not in use for longer periods.
5.1 Protective circuits
The amplifier of the subwoofer is provided with pro-
tective circuits to prevent overload and overheat-
ing. If the POWER LED shows red although the
STAND BY switch (10) is set to “ON” or if the colour
of the POWER LED changes to red despite a suffi-
cient signal, a protective circuit has been activated.
In this case, switch off the subwoofer and eliminate
the cause of defect.
CAUTION
Never adjust the audio system to a
very high volume. Permanent high
volumes may damage your hearing!
Your ear will get accustomed to high
volumes which do not seem to be that
high after some time. Therefore, do
not further increase a high volume
after getting used to it.
10
GB
