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Multichannel PA Amplifier
These instructions are intended for experts with
specific knowledge in PA technology . Please read
these operating instructions carefully prior to
operation and keep them for later reference . All
operating elements and connections described
can be found on the fold-out page 3 .
1 Operating Elements and
Connections
1.1 Front panel
1 LED CLIP lights up if the respective channel
is overloaded and in case of short circuit of
the respective output
2 LED row for level indication
3 LED BRIDGE lights up when the switch for
the operating mode (7) of the corresponding
channel pair is pressed
4 POWER LED
5 POWER switch
1.2 Rear panel
6 GROUND LIFT switch
position GND: signal ground and housing
ground are connected
position LIFT: signal ground and housing
ground are separated
7 Operating mode switch for the respective
channel pair
switch pressed: bridge operation
not pressed:
normal operation
8 INPUT jacks as XLR jacks for units with line
level (contact configuration see fig . 3)
9 Selector switches for the filter mode of each
channel
switch pressed: low pass filter (LO-PASS)
not pressed:
high pass filter (HI-PASS)
10 Switches for activating / deactivating the filter
for the respective channel
switch pressed: filter on (FILTER)
not pressed:
filter off (BYPASS)
11 Volume control for the respective channel
12 Plug-in screw terminals* for the respective
channel (contact configuration also see
fig . 4)
contacts 1 to 3:
alternative INPUT, directly connected to
the respective XLR input (8); also suita-
ble for feeding the signal through to the
input terminals of other channels
contacts 4 and 5:
speaker connections OUTPUT
13 Fuse holder; only replace a blown fuse by
one of the same type
14 Mains jack for power supply for connection
to 230 V/ 50 Hz
* For better handling, the connection terminals can be
removed from their plug-in connection .
6
2 Safety Notes
This unit corresponds to all relevant directives of
the EU and is therefore marked with
WARNING The unit is supplied with hazard-
ous mains voltage . Never make
any modifications on the unit and
do not insert anything through
the air vents! This may cause an
electric shock .
There is a hazard of contact at the speaker
connections with a dangerous voltage during
operation . All connections must only be made
or changed with the unit switched off .
•
The unit is suitable for indoor use only . Protect
it against dripping water and splash water,
high air humidity, and heat (admissible am-
bient temperature range 0 – 40 °C) .
•
Do not place any vessels filled with liquid, e . g .
drinking glasses, on the unit .
•
The heat being generated in the unit must be
carried off by air circulation . Therefore, the air
vents at the housing must not be covered .
•
Do not set the unit into operation, or imme-
diately disconnect the mains plug from the
mains socket if
1 . there is visible damage to the unit or to
the mains cable,
2 . a defect might have occurred after a drop
or similar accident,
3 . malfunctions occur .
The unit must in any case be repaired by
skilled personnel .
•
Never pull the mains cable to disconnect the
mains plug from the mains socket, always
seize the plug .
•
For cleaning only use a dry, soft cloth, by no
means chemicals or water .
•
No guarantee claims for the unit and no liabil-
ity for any resulting personal damage or mate-
rial damage will be accepted if the unit is used
for other purposes than originally intended, if
it is not correctly connected, operated, or not
repaired in an expert way .
If the unit is to be put out of operation
definitively, take it to a local recycling
plant for a disposal which will not be
harmful to the environment .
3 Applications
The PA multichannel amplifier is suitable for
versatile applications, e . g . on stage, in the dis-
cothèque, or in the catering trade . The amplifier
has four (STA-1504), six (STA-1506), or eight
(STA-1508) separate channels which can also be
combined in pairs in bridge operation to increase
the output power . High pass filters and low pass
filters which can individually be switched for
each channel allow the use as a 2-way system
without additional crossover network . Extensive
protective circuits protect the amplifier and the
connected speakers .
Page 3 shows five examples for versatile ap-
plications:
Fig . 6:
Independent operation of four chan-
nels with four different input signals .
Fig . 7:
Channel group of which the input sig-
nal of the first channel is fed through
to the inputs of the other channels; the
volume can independently be adjusted
for each channel
.
Fig . 8:
Combination of channel pairs in bridge
operation to increase the output
power
Fig . 9:
Division of two input signals in two fre-
quency ranges each for separately driv-
ing mid-high range speakers (HIGH)
and bass speakers (LOW) with separate
volume control of all outputs
Fig . 10: A combination possibility of the con-
figurations shown before, e . g . for a
PA output and a monitor way: signal
B drives a mid-high range speaker via
channel CH2; the bass part which
generally requires a higher amplifier
power is amplified by channels CH3
and CH4 in bridge operation . Signal A
is independently amplified via channel
CH1 .
These are only some examples for the config-
uration possibilities of the amplifier . Numerous
other combinations are possible, especially for
the 6-channel or 8-channel models .
4 Installaton
The amplifier is designed to be mounted into a
rack (482 mm / 19"), but it may also be used as
a table top unit . In any case air must be allowed
to move freely through all air vents so that a
sufficient cooling is ensured .
4.1 Rack installation
For the rack mounting 3 rack spaces = 133 mm
are required . Additional space should remain
above and below the amplifier in order to ensure
sufficient ventilation .
In order to prevent that the rack becomes
top-heavy, the amplifier has to be mounted in
the lower part of the rack . The front plate alone
is not sufficient as a secure fastening . The unit
has to be additionally supported by side rails or
a bottom carrier plate .
5 Connecting the Amplifier
All connections must only be made if the unit
is switched off!
5.1 Inputs
Connect the output of a preamplifier or mixer
to the XLR jacks INPUT (8) or plug-in screw ter-
minals* (12) . Both connections are designed for
balanced signals; the contact configurations are
shown in figures 3 and 4 . It is also possible to
pick up an input signal which is fed to the XLR
jack (8) of a channel from the plug-in screw
terminals* (12) of the same channel and to feed
it through to the input of another channel (as
in case of examples in figures 7, 9, and 10) . For
this purpose connect in each case the contacts 1
(SIGNAL+) and 2 (SIGNAL−) of the plug-in screw
terminals* of both channels with each other . The
contacts 3 (GND) must not be connected exter-
nally as they are already internally connected .
The input signal should have line level . For rated
power of the amplifier an input signal of 0 .7 V
is required as a minimum .
If only an unbalanced signal is available at
the output of the signal source, it can be con-
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