Power Supply - Monacor SAM-2 Mode D'emploi

GB protective circuits (against short circuit, overheat ing,
and direct voltage content at the output).
It is the particular advantage of SAM-2 that it can be
placed anywhere in the room as a fully assembled
active subwoofer. Level and phase controls allow opti-
mum matching to the satellite speakers.
4 Installation
WARNING
During installation, the module must
never be connected to the mains volt-
age!
1) For installing the module into the speaker cabinet,
saw a cutout of 155 × 340 mm. If the front panel is
not recessed, the required mounting depth is 85 mm.
2) Only connect speakers or speaker systems of a
total impedance of at least 4 Ω. Use push-on termi-
nals to connect the speaker to the connections
OUT+ and OUT- on the top left of the PCB of the
power amplifier. Observe the correct polarity, i. e.
connect the positive pole of the speaker to the con-
tact OUT+.
3) Use ten M4 screws to screw the module to the cab-
inet.
5 Connection
Always switch off the active speaker system prior to
making or changing any connections.
5.1 Inputs
The module SAM-2 is equipped with two inputs:
1. The phono jacks LINE IN (13) for signals with line
level for connecting e. g. preamplifier, mixer, equal-
izer, effect unit, etc.
2. The binding posts HIGH LEVEL INPUT (12) for
connecting the speaker outputs of a power ampli-
fier.
Important: If the binding posts are used, the output
power of the power amplifier connected must not
exceed 480 W per channel at 4 Ω speakers or
240 W per channel at 8 Ω speakers, otherwise
there will be signal distortions due to overload.
Connection to the jacks LINE IN (13) is the easiest and
safest solution. The inputs HIGH LEVEL INPUT (12)
should only be used if no line signal is available. Use
speaker cables to connect these inputs to the speaker
outputs of a power amplifier.
Be careful when connecting via the binding posts!
a. In case of power amplifiers with a higher output
power than indicated above, there will be a hazard
of contact as dangerous voltage is applied to the
jacks HIGH LEVEL INPUT.
8
b. In case of accidental short circuit, the power ampli-
fier may be damaged.
c. Observe the correct polarity for connection: Con-
nect the corresponding positive pole (speaker
cable core with marking) to the red binding post.
5.2 Outputs
Connect the phono jacks SAT OUT (14) to the inputs
of a stereo power amplifier operating the satellite
speakers.
In case of separable full amplifiers of high quality
provided with a controlled preamplifier output (possibly
marked "Pre Out") and a power amplifier input (possi-
bly marked "Amp In"), it is also possible to insert the
module SAM-2 into the full amplifier: Connect the
jacks LINE IN (13) to the preamplifier output and the
jacks SAT OUT (14) to the power amplifier output.

5.3 Power supply

Finally connect the supplied mains cable first to the
mains jack (10) and then to a mains socket (230 V~/
50 Hz).
6 Operation
Any adjustments and sound evaluations must only be
made in connection with the satellite speakers. The
sound should be evaluated at the final place of hearing
where a second person at the active subwoofer should
be instructed to perform an optimum adjustment.
1) Switch on the active speaker system with the
switch POWER (9). As long as no input signal is
available, the system is in the power-saving stand-
by mode and the indicating LED (1) shows red. As
soon as an input signal is available, the power
amplifier is switched on and the LED shows green.
If no signal is available for more than approx.
7 minutes, the active speaker system returns
to stand-by (LED = red). If the active speaker sys-
tem is not used for a longer period, it should be
switched off with the switch POWER, otherwise the
stand-by mode will always have a low current con-
sumption.
If the automatic switchover between stand-by
and operation does not function optimally, the
switch-on threshold can be modified in the range of
1 – 10 mV. The control for the switch-on threshold is
in the position RVa on the PCB of the preamplifier.
The further the control is turned clockwise, the
higher the required input level at which the module
will be switched on.
2) If a ground loop has been created by the connec-
tion, humming will occur (e. g. with music passages
of low volume). This ground loop can be interrupted
with the groundlift switch (15). On the other hand,
the amplifier is not screened against electric noise
fields if the front plate is not grounded. In case of
doubt, set the switch alternately to find the optimum
adjustment.