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Stereo PA Amplifier
These instructions are intended for users with
expert knowledge in PA technology . Please
read the instructions carefully prior to opera-
tion and keep them for later reference .
Contents
1
Overview . . . . . . . . . . . . . . 8
2
Safety Notes . . . . . . . . . . . . 8
3
Applications . . . . . . . . . . . . . 9
4
Setting Up the Amplifier . . . . . . 9
4 .1 Installation into a rack . . . . . . . . 9
5
Connections . . . . . . . . . . . . . 9
5 .1 Signal input and
feed-through output . . . . . . . . . 9
5 .2 Speakers . . . . . . . . . . . . . . . 9
5 .3 Power supply . . . . . . . . . . . . 10
6
Operation . . . . . . . . . . . . . 10
6 .1 Selecting the operating mode . . . 10
6 .2 Selecting the filter . . . . . . . . . 10
6 .3 Switching on /off . . . . . . . . . . 10
6 .4 Adjusting the level . . . . . . . . . 10
6 .5 Ground lift switch . . . . . . . . . 10
7
Protective circuits . . . . . . . . . 11
8
Specifications . . . . . . . . . . . 11
8
PROTECT
LIMITER
SIGNAL
ACTIVE
L-CH
1
2
L-CH IN
LINK
SUBWOOFER
P2
OUT
GROUND
P3
P1
2
1
1
2
70 Hz 120 Hz
ON
3
3
HPF 100Hz
BYPASS
BRIDGE
R-CH IN
LINK
SUBWOOFER
P2
LOW-CUT 30 Hz
OUT
P3
P1
2
1
1
2
70 Hz 120 Hz
ON
3
3
HPF 100Hz
BYPASS
4
5
6
7
8 9 10
1 Overview
1 Status LEDs
one each for the channels L-CH and R-CH
PROTECT
lights up when the protective circuit dis-
connects the speaker from the amplifier:
briefly after switching on and in case of
overload / overheating of the amplifier
LIMITER
lights up when the limiter circuit has been
activated to reduce the signal in order to
prevent overload
SIGNAL
lights up when a certain volume level is
exceeded
ACTIVE
power LED
2 Volume controls
one control each for the channels L-CH
and R-CH
Note: In the bridge mode, the control for
channel R-CH is without function .
3 POWER switch
4 XLR input jacks
one jack each for the channels L-CH and
R-CH
Note: In the bridge mode, the input for
channel R-CH is without function .
5 XLR feed-through outputs to route the
input signals, for example, to an addi-
tional amplifier
6 Control SUBWOOFER
When the switch underneath the control
is in the left position, the control can be
used to adjust the crossover frequency for
a subwoofer connected .
7 Selector switch for using the filter for
channels L-CH and R-CH
HPF
high-pass filter
BYPASS no filter
left
low-pass filter
R-CH
2
L-CH
L-CH
1+
1-
OUT
POS
NEG
R-CH
1+
1-
POS
NEG
OFF
BRIDGE
1+
1-
BRIDGE
MODE
POS
NEG
PARALLEL
R-CH
STEREO
OUT
OFF
11
12
PROTECT
ON
STA-900A
LIMITER
SIGNAL
OFF
ACTIVE
1
3
CIRCUIT
BREAKER
230V~
50Hz
13
14
8 Selector switch GROUND to connect the
signal ground to the housing ground
OFF disconnection of signal ground and
housing ground (ground lift)
ON connection of signal ground and
housing ground
9 Selector switch LOW CUT for the high-
pass filter (30 Hz) to suppress low-
frequency interference (impact sound,
rumble)
10 Selector switch MODE for the operat-
ing mode: bridge mode, stereo mode or
parallel mode
11 Speaker jack BRIDGE for the bridge mode
12 Speaker jacks for the stereo mode and
parallel mode
13 Mains jack for connection to a socket
(230 V/ 50 Hz) via the mains cable provided
14 for model STA-1500A only:
Circuit breaker to protect the amplifier
When the circuit breaker has tripped,
press the button to reset it .
2 Safety Notes
This unit corresponds to all relevant directives
of the EU and is therefore marked with
WARNING This unit uses dangerous
mains voltage . Leave servic-
ing to skilled personnel only
and do not insert anything into
the air vents . Inexpert handling may result
in electric shock .
•
The unit is suitable for indoor use only . Pro-
tect it against dripping water, splash water
and high air humidity . The admissible ambi-
ent temperature range is 0 – 40 °C .
•
Do not place any vessel filled with liquid on
the unit, e . g . a drinking glass .
•
The heat produced inside the unit must be
dissipated by air circulation; never cover
the air vents .
.
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