Mains Connection; Switching On/Off; Adjusting The Level; Groundlift Switch - Monacor STA-1603CLUB Mode D'emploi

Table fig . 3 also shows possibilities of
connection for several speakers to one
output . In each case, it is stated which power
rating (P ) each speaker must have as a min-
min
imum with the corresponding impedance (Z) .
When interconnecting several speakers, special
attention has to be paid to the correct connec-
tion of the positive and negative terminals .
Important: The total impedance at one of the
outputs L-CH and R-CH must not fall below
4 Ω, at the output SUB it must not fall below
2 Ω!

5.3 Mains connection

Connect the mains cable to the mains jack (13)
and the mains plug to a socket (230 V/ 50 Hz) .
Make sure that the electric circuit the unit will
be connected to is protected by a fuse of a
corresponding rating (16 A) .
6 Operation
6.1 Switching on / off
To prevent loud switching noise, always switch
on the power amplifier in an amplifier system
after all other units have been switched on and
switch it off first after operation . Prior to first
switching-on, set the volume controls (1 to 3)
to the left stop .
Switch on the amplifier with the POWER
switch (5) . The power LED (6) lights up . After
switching-on, the LEDs PROTECT (4) light up
for a short time . During this time, the switch-on
delay is activated to protect the speakers . Then
the LEDs PROTECT extinguish .
6.2 Adjusting the filter frequencies
The amplifier channels LEFT, RIGHT and SUB are
each equipped with a filter to prevent that the
frequencies which are beyond the frequency
range of the connected speaker will be an
unnecessary load for this speaker or cause
distortions .
Separately adjust the cut-off frequency by
means of the control CROSSOVER FREQUENCY
(10) for the channels LEFT and RIGHT and the
channel SUB (11) (70 – 120 Hz) . The frequencies
should correspond to the frequency ranges of
the speakers used .
The amplifier channel SUB additionally has
a fixed high pass filter with a cut-off frequency
of 40 Hz .

6.3 Adjusting the level

Control the level of the output of the mixer
or preamplifier to its rated level (0 dB) or the
highest undistorted output signal . Turn up the
controls LEFT (1) and RIGHT (2) so far until the
maximum desired volume is reached . Add the
desired low bass part with the control SUB (3)
via a subwoofer connected . The LEDs SIGNAL
(4) light up when a signal is present at the re-
spective input and the corresponding volume
control is turned up . If the red LEDs LIMITER
light up, the limiter circuit is active and prevents
overload of the amplifier . In this case slightly
turn back the controls .
CAUTION Never adjust the amplifier to a
very high volume . Permanent
high volumes may damage your
hearing! The human ear will get
accustomed to high volumes
which do not seem to be that
high after some time . There-
fore, do not further increase a
high volume after getting used
to it .

6.4 Groundlift switch

If an interfering hum noise can be heard with-
out a music signal, a ground loop may be the
reason for this . Ground loops may occur if two
units have contact both via the signal ground
and via the earthed conductor of the power
supply or a conductive connection of the hous-
ings in the rack . To separate this ground loop,
disengage the switch GROUNDLIFT (8) .
8 Specifications
RMS output power (rated power)
(1 kHz, 0 .1 % THD + N)
LEFT, RIGHT at 4 Ω
LEFT, RIGHT at 8 Ω
SUB at 2 Ω
SUB at 4 Ω
SUB at 8 Ω
Input sensitivity for
rated power at 8 Ω
Input impedance bal . / unbal .
Frequency range with 1 W at 8 Ω
LEFT, RIGHT
SUB
High pass filter LEFT, RIGHT
Low pass filter SUB
High pass filter SUB
THD
LEFT, RIGHT (1 kHz, 5 W at 4 Ω)
SUB (100 Hz, 5 W at 4 Ω)
Channel separation (1 kHz, with rated power at 4 Ω)
S / N ratio (with rated power at 4 Ω)
Output circuit
Ambient temperature
Power supply
Max . power consumption
Dimensions (W × H × D)
Weight
All rights reserved by MONACOR
may be reproduced in any form or by any means for any commercial use.
7 Protective Circuits
The protective circuits are provided to prevent
damage to the speakers and to the ampli-
fier . The integrated level limiter reduces the
input signal when the limit level at the output
is reached . Thus, in case of overload of the
amplifier, distortions can be prevented which
might damage the speakers . If the limiter is ac-
tive, the LED LIMITER (4) of the corresponding
channel lights up .
Due to an additional protective circuit, the
speakers are disconnected from the output of
the channel concerned . If it is active, the cor-
responding LED PROTECT (4) lights up:
1 . for a short time after switching-on
(switch-on delay)
2 . in case of overload / overheating
3 . if a DC voltage occurs at the output
If an LED PROTECT does not extinguish after
switching-on or if the circuit breaker (14) has
been released, the amplifier must be switched
off and the cause for the defect must be elimi-
nated . If required, reset the circuit beaker: Press
the circuit breaker when the amplifier has been
switched off .
70 Hz – 120 Hz, 12 dB / octave
70 Hz – 120 Hz, 12 dB / octave
® INTERNATIONAL GmbH & Co. KG. No part of this instruction manual
2 × 320 W
2 × 200 W
1300 W
850 W
550 W
1 V
20 kΩ / 10 kΩ
70 – 20 000 Hz (±1 dB)
40 – 120 Hz (±1 dB)
40 Hz, 12 dB / octave
< 0 .05 %
< 0 .08 %
> 59 dB
> 81 dB
class AB
0 – 40°C
230 V/ 50 Hz
3200 VA
483 × 132 × 384 mm, 3 RS
25 kg
Subject to technical modification .
7