6 Operation
6.1 Selecting the operating mode
Select the desired operating mode for each chan-
nel pair with the switches OPERATING MODE (7):
NORMAL = normal operation, each channel of a
channel pair operates separately, i. e. each
channel receives an input signal of its own
which is available with 50 W
RMS
power (at
4 Ω) at the corresponding output.
BRIDGE = bridge operation, the channels of a
channel pair are bridged for power doubling.
100 W (at 8 Ω) are available at the corre-
sponding output terminals. Only feed the
input signal to the corresponding odd-num-
bered jack in each case.
6.2 Switching the amplifier 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 controls LEVEL (3) to the
left stop to zero.
Switch on the amplifier with the POWER
switch (4). The switch lights up as a power indi-
cation.
6.3 Adjusting the volume
muting the channel
1) Adjust the outputs of the signal sources (e. g.
mixer, preamplifier) to the rated level (0 dB)
or the maximum undistorted output signal.
2) Turn up the controls LEVEL (3) of the chan-
nels used so far until the maximum desired
volume is reached. Turn the controls of the
channels not used to zero.
For channel pairs operating in bridge
mode, only adjust the volume with the corre-
sponding left control (CHANNEL 1, 3, 5 or 7).
Set the other control to zero; it does not have
any function.
If one of the red indications CLIP (2)
shortly lights up, the maximum possible vol-
ume will be reached. If it shortly lights up
more frequently, the channel is overloaded.
In this case slightly turn back the correspon-
ding control.
3) Each channel may be muted separately, e. g.
if the background music is disturbing for an
announcement. For this purpose press the
corresponding button MUTE (1).
For channel pairs operating in bridge
mode, it is only necessary to press the corre-
sponding left button MUTE (CHANNEL 1, 3,
5 or 7). The other button does not have any
function.
7 Specifications
Subject to technical modification.
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 vol-
umes which do not seem to be
that high after some time.
Therefore, do not further in-
crease a high volume after get-
ting used to it.
7
GB
All rights reserved by MONACOR
®
INTERNATIONAL GmbH & Co. KG. No part of this instruction
manual may be reproduced in any form or by any means for any commercial use.
Model
STA-450D
STA-850D
RMS output power
normal operation at 4 Ω
normal operation at 8 Ω
bridge operation at 8 Ω
Maximum total power
4 × 50 W
4 × 30 W
2 × 100 W
300 W
8 × 50 W
8 × 30 W
4 × 100 W
600 W
Input sensitivity for rated power
XLR jacks
phono jacks
Input impedance
550 mV
1 V
20 kΩ
Frequency range
10 – 20 000 Hz
Crosstalk
> 45 dB
Output circuit
class D
Ambient temperature
0 – 40 °C
Power supply
Max. power consumption
230 V~/ 50 Hz
300 VA
230 V~/ 50 Hz
600 VA
Dimensions (W × H × D)
482 × 89 × 330 mm
2 RS (rack spaces)
Weight
7.2 kg
10.5 kg