10
English
5) When setting up a single subwoofer, it is not
important to place the subwoofer exactly in
the middle between the stereo speakers as
it will not be possible to precisely locate the
very low frequencies reproduced by the sub-
woofer . However, do not place it too close
to walls or in corners; this would distort the
frequency response .
Prior to making connections or changing any
existing connections, switch off the amplifier
module and the units to be connected .
4.1 Connecting a signal source
Connect a signal source with line level (e . g . out-
put of a mixer or preamplifier) to the RCA jacks
LINE IN (8) . When connecting a stereo signal
source, a mono signal is internally created . It is
also possible to connect the jack L / LFE to an LFE
output . In multi-channel systems for cinema ap-
plications, e . g . “5 .1”, the LFE channel is used for
low-frequency special effects (“Low Frequency
Effect” or “Low Frequency Enhancement”) .
Alternatively, connect the screw terminals
HIGH LEVEL INPUT (10) to the speaker outputs
of a power amplifier [in parallel to the speakers
connected there] . Connect the left channel to
the terminal pair “L”, connect the right channel
to “R” . Observe the correct polarity: Always con-
nect the positive pole (marked core of speaker
cable) to the red terminal .
Caution!
•
Only connect amplifiers with a maximum out-
put voltage of 2 × 20 V (corresponding to an
output power of 2 × 100 W at 4 Ω or 2 × 50 W
at 8 Ω) to these terminals .
•
When connecting the screw terminals, make
sure that the cable ends are only stripped for
the length required and that no bare wires
protrude (hazard of contact and short circuit) .
4.2 Signal output
At the RCA jacks LINE OUT (9), the input signal
is available for being routed to another amplifier
or active speaker system . The position of the
controls LEVEL (5), CUT OFF (6) and PHASE (7)
has no effect on this output signal .
4.3 Power supply
Connect the mains cable provided to the
mains jack (2) and the plug to a mains socket
(230 V/ 50 Hz) .
5 Operation
CAUTION
Never adjust the speaker system
to a very high volume . Permanent
high volumes may damage your
hearing! Your ear will get accus-
tomed 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 .
Note:
To prevent switching noise, always switch on
the signal source connected before switching on the
amplifier module . After use, switch off the amplifier
module first .
1) Before switching on for the first time, set the
LEVEL control (5) to minimum (left stop) for
the time being . Switch on the amplifier with
the POWER switch (1) . As long as no signal
is applied, the module is on standby to save
power and the LED STANDBY/POWER (4)
shows red . As soon as a signal is applied, the
power amplifier is switched on and the LED
shows green .
2) Via the existing speaker system, reproduce
music, for example, and add the desired low
bass part with the LEVEL control (5) . Only
turn up the control to such an extent that the
sound reproduced is not distorted .
3) Use the control CUT OFF (6) to set the upper
cut-off frequency of the subwoofer in such
a way that it will optimally complement the
frequency response of the other speakers .
4) When the speakers are placed at different
distances to the listener, phase cancellation
may result (certain frequencies are repro-
duced at a lower volume) . To compensate
this effect, shift the phase of the subwoofer
signal with the control PHASE (7) .
Test the positions of the control to find
the one offering the bass reproduction of
the highest volume at the listening position .
Then readjust the volume balance with the
LEVEL control (5), if required .
5) If there is no signal at the input for more than
approx . 25 minutes, the amplifier module goes
on standby: The LED STANDBY/ POWER (4)
shows red . If the amplifier module is not in
use for longer intervals, switch off the ampli-
fier module with the POWER switch .
Summary of Contents for 32.0790
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