Operation - Monacor SAM-1 Bedienungsanleitung

4 Assembly
GB
During assembly, the module must never be
connected to the mains voltage!
1) For installing the module into the speaker cabinet,
saw a cutout of 140 x 250 mm. The required
mounting depth is 90 mm if the front panel is not
recessed.
2) Prior to the installation, select the operating mode
with the sliding switch S2 (12) on the PCB:
For operation as a subwoofer, slide the switch fully
to the left (factory-set).
For operation as a full range speaker, slide the
switch fully to the right.
3) Only speakers or speaker systems with a total
impedance of at least 4 Ω may be connected. Use
push-on terminals to connect the speaker to the
connection OUTPUT (11) on the PCB. Observe
the correct polarity, i. e. connect the positive pole
of the speaker to the contact OUT+.
4) Screw the module to the cabinet by means of ten
M4 screws.

5 Operation

5.1 Connecting the unit
Prior to connecting the signal source or to changing
existing connections, switch off the active speaker
system.
The module SAM-1 is equipped with two inputs:
1. The phono jacks LINE IN (10) for signals with line
level for connecting e. g. preamplifier, mixer,
equalizer, effect unit, etc.
2. The binding posts HIGH LEVEL INPUT (1) for
connecting the speaker outputs of a power ampli-
fier
Important: If the binding posts are used, the out-
put power of the connected power amplifier must
not exceed 272 W per channel at 4 Ω speakers or
136 W per channel at 8 Ω speakers, otherwise
there will be signal distortions due to overload.
Connection via a cable with phono connectors to the
LINE IN jacks is the easiest and safest solution. The
inputs HIGH LEVEL INPUT should only be used if no
line signal is available. Use speaker cables to
connect this input in parallel to the speakers of the
power amplifier.
When operated as a subwoofer or a mono active
speaker cabinet, always connect the left and the right
channels of the signal source. Both channels are
internally combined to a mono signal. When operated
as a full range speaker cabinet for a stereo channel,
only connect the left or the right channel.
Be careful when connecting via binding posts!
a. In case of power amplifiers with a higher output
power than indicated above, there is a hazard of
an electric shock due to their high output voltage.
b. In case of an accidental short circuit, the power
amplifier may be damaged.
10
c. Observe the correct polarity for connection:
Connect the corresponding positive pole (marked
cable core of speaker) to the red binding post.
5.2 Adjustments
If the active speaker cabinet operates as a sub-
woofer, all adjustments and sound evaluations can
only be made in connection with the main speakers.
The sound should be evaluated at the final listening
location and a second person at the active subwoofer
should be instructed to perform an optimum adjust-
ment.
1) Switch on the active speaker cabinet with the
POWER switch (3). As long as no signal is applied,
the speaker system is in the power-saving stand-
by mode and the control LED (5) shows red. As
soon as a signal is applied, the power amplifier is
switched on and the LED shows green.
If no signal is applied for longer than approx.
7 minutes, the active speaker cabinet will switch
back to stand-by (LED = red).
2) If a ground loop has been created due to the
wiring, humming will result (e. g. during music pas-
sages of low volume). This ground loop can be
interrupted with the groundlift switch (9). For this
purpose, press the button until it locks into place.
On the other hand, the amplifier is not shielded
against electric noise fields if the housing is not
earthed. In this case, release the groundlift switch.
In case of doubt, press the button alternately to
find the optimum adjustment.
3) If the active speaker cabinet operates as a sub-
woofer, adjust the upper limit frequency with the
CROSSOVER control (8); i. e. the frequency which
is not to be reproduced by the subwoofer any more
(the lower the upper limit frequency, the more diffi-
cult the acoustic locating of the subwoofer; the
higher the limit frequency, the more powerful the
bass support). In most cases, an optimum comple-
tion of rack speakers and small free-standing
speakers is obtained with an adjusted limit fre-
quency between 60 and 100 Hz.
Note: If the active speaker system operates as a
full range speaker system, the CROSSOVER con-
trol is without function.
4) Adjust the volume ratio to the other speakers with
the LEVEL control (6). If the active speaker system
operates as a subwoofer, a natural or a deliber-
ately amplified bass reproduction can be adjusted
with the control.
5) If the active speaker system operates as a sub-
woofer, adjust the phase with the PHASE control
(7). According to the acoustic conditions, this
adjustment is more or less audible. The phase can
best be evaluated during a music piece with an
electric bass, a contrabass, or a deep bass voice.
Set the PHASE control to the bass reproduction of
the highest volume.
Note: If the active speaker system operates as a
full range speaker system, the PHASE control is
without function.