Monacor PA SAM-1 Mode D'emploi page 10

5.2 Adjustments
GB
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 adjustment.
1) Switch on the active speaker cabinet with the
POWER switch (2). As long as no signal is applied,
the speaker system is in the power-saving stand-by
mode and the indicating 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 passages 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 system operates as a subwoofer, use the
control CROSSOVER (8) to adjust the cross-over
frequency, i. e. the frequency not to be reproduced
any more by the subwoofer (the lower the crossover
frequency, the more difficult the sound location of the
subwoofer; the higher the crossover frequency, the
more powerful the bass support). In most cases,
bookshelf speakers and small standing speakers are
completed in an optimum way if the crossover fre-
quency is adjusted in the range of 60 to 100 Hz.
Note: If the active speaker system operates as a full
range speaker system, the CROSSOVER control 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 with-
out function.
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10
INTERNATIONAL GmbH & Co. KG. No part of this instruction manual may
®
6 Specifications
Output power
at 4 Ω speaker: . . . . . . . 90 W
at 8 Ω speaker: . . . . . . . 65 W
THD: . . . . . . . . . . . . . . . . . < 0.1 %
Frequency range
Full range operation: . . . 20 – 20 000 Hz
Subwoofer operation: . . 20 Hz to 50 — 150 Hz
Output impedance: . . . . . . 4 – 8 Ω
Input impedance
Line in: . . . . . . . . . . . . . 24 kΩ
High level input: . . . . . . 17 kΩ
Max. input voltage
Line in: . . . . . . . . . . . . . 4.7 V mono, 2.3 V stereo
High level input: . . . . . . 33 V stereo,
S / N ratio: . . . . . . . . . . . . . . > 70 dB
Power supply: . . . . . . . . . . 230 V~ / 50 Hz
Power consumption
Full load: . . . . . . . . . . . . 120 VA
No-load: . . . . . . . . . . . . 2.5 VA
Stand-by: . . . . . . . . . . . . 0.6 VA
Stand-by activation: . . . . . after approx. 7 minutes
Ambient temperature: . . . . 0 – 40 °C
Required cabinet cutout: . . 140 × 250 mm
Mounting depth,
front panel not recessed: . 90 mm
Dimensions: . . . . . . . . . . . 170 × 280 × 95 mm
Weight: . . . . . . . . . . . . . . . 3.3 kg
Subject to technical modification.
, 120 W
RMS MAX
, 90 W
RMS MAX
(adjustable)
corresponds to
2 × 272 W at 4 Ω or
2 × 136 W at 8 Ω
without signal