Connecting The Amplifier; Individual Operation - Monacor STA-1004 Mode D'emploi

fixing the amplifier safely . In addition, use the
mounting straps at the rear to screw the ampli-
fier to the rack .
The hot air given off by the amplifier must
be dissipated from the rack to the rear or to the
top; otherwise, heat will accumulate in the rack
which may not only damage the amplifier but
also other units in the rack . In case of insufficient
heat dissipation, install a ventilation unit into the
rack above the amplifier .

5 Connecting the Amplifier

Caution!
Any connections should be made by skilled
personnel only . Always switch off the amplifier
before connecting . Do not remove the insu-
lating pins from the output jacks (14) which
are not connected . This will prevent an electric
shock in case of accidental contact .
The connection of the inputs and of the speak-
ers depends on the operating mode selected .
Therefore, prior to making any connections,
always select the optimum operating mode for
the corresponding application . The different
modes are shown in fig . 3 – 9 .
Note: When selecting the input jacks, the XLR inputs
(12) should be preferred as a balanced signal transmis-
sion offers the best interference suppression, especially
in case of long connection cables . If the outputs of the
signal sources are unbalanced, connect them to the
6 .3 mm jacks (13) .

5.1 Individual operation

For individual operation (fig . 3), each power
amplifier receives a separate signal . For this
operating mode, unlock all switches (8) on the
rear panel of the unit:
SUBWOOFER /
LINK 2 + 4 MODE B LINK 1 + 3
CROSSOVER
SOLO STEREO SOLO OTHER
Switch positions for individual operation
= switch unlocked, = switch locked
5.1.1 Inputs
Connect the line signal sources (e . g . preampli-
fier, mixer, etc .) to the input jacks CH 1 to CH 4 .
The XLR jacks (12) or the 6 .3 mm jacks (13) can
be used as inputs .
5.1.2 Outputs
The amplifier is able to operate four speakers or
four speaker groups . The highest output power
is obtained when connecting 4 Ω speakers and
speaker groups of a total impedance of 4 Ω
each . However, it is also possible to connect 8 Ω
speakers or speaker groups with a total imped-
ance of 8 Ω . In this case, the output power will
be slightly reduced . The minimum RMS power
capability of the speakers or speaker groups
must be:
4 Ω speaker: 250 W
8 Ω speaker: 160 W
Connect the speakers or speaker groups to the
output jacks (14):
CH 1+ = positive pole of speaker, channel 1
CH 1− = negative pole of speaker, channel 1
CH 2+ = positive pole of speaker, channel 2
CH 2− = negative pole of speaker, channel 2
CH 3+ = positive pole of speaker, channel 3
CH 3− = negative pole of speaker, channel 3
CH 4+ = positive pole of speaker, channel 4
CH 4− = negative pole of speaker, channel 4
5.2 Channel group mode
In the channel group mode (fig . 4), the four
power amplifiers receive a common input signal .
Set the switches (8) on the rear panel of the
unit as follows:
LINK 2 + 4 MODE B LINK 1 + 3
2 STEREO
Switch positions for the channel group mode
= switch unlocked,
5.2.1 Inputs
Connect the line signal source (e . g . preampli-
fier, mixer, etc .) to the input jack CH 1 . The XLR
jack (12) or the 6 .3 mm jack (13) can be used
as input . The inputs CH 2, CH 3, and CH 4 are
not connected .
5.2.2 Outputs
The amplifier is able to operate four speakers or
four speaker groups . The highest output power
is obtained when connecting 4 Ω speakers and
speaker groups with a total impedance of 4 Ω
each . However, it is also possible to connect 8 Ω
speakers or speaker groups with a total imped-
ance of 8 Ω . In this case, the output power will
be slightly reduced . The minimum RMS power
capability of the speakers or speaker groups
must be:
4 Ω speaker: 250 W
8 Ω speaker: 160 W
Connect the speakers or speaker groups to the
output jacks (14):
CH 1+ = positive pole of speaker, channel 1
CH 1− = negative pole of speaker, channel 1
CH 2+ = positive pole of speaker, channel 2
CH 2− = negative pole of speaker, channel 2
LINK 1 + 2 MODE A
CH 3+ = positive pole of speaker, channel 3
CH 3− = negative pole of speaker, channel 3
SOLO STEREO
Table 3 CH 4+ = positive pole of speaker, channel 4
CH 4− = negative pole of speaker, channel 4
5.3 Stereo parallel operation
In parallel operation (fig . 5), channels 1 and 3
and channels 2 and 4 respectively receive the
same input signal . Set the switches (8) on the
rear panel of the unit as follows:
LINK 2 + 4 MODE B LINK 1 + 3
2 STEREO
Switch positions for stereo parallel operation
= switch unlocked,
5.3.1 Inputs
Connect the output of the line source (e . g .
preamplifier, mixer, etc .) to the inputs of the
amplifier:
Connect the left channel to the input jack CH 1
and the right channel to the input jack CH 2 .
The XLR jacks (12) or the 6 .3 mm jacks (13) can
be used as inputs . The inputs CH3 and CH4 are
not connected .
5.3.2 Outputs
The amplifier is able to operate four speakers or
four speaker groups . The highest output power
is obtained when connecting 4 Ω speakers and
speaker groups with a total impedance of 4 Ω
each . However, it is also possible to connect 8 Ω
speakers or speaker groups with a total imped-
ance of 8 Ω . In this case, the output power will
SUBWOOFER /
LINK 1 + 2 MODE A
CROSSOVER
1 OTHER 1 STEREO
Table 4
= switch locked
SUBWOOFER /
LINK 1 + 2 MODE A
CROSSOVER
1 OTHER SOLO STEREO
Table 5
= switch locked
be slightly reduced . The minimum RMS power
capability of the speakers or speaker groups
must be:
4 Ω speaker: 250 W
8 Ω speaker: 160 W
Connect the speakers or speaker groups to the
output jacks (14):
CH 1+ = positive pole of speaker, left 1
CH 1− = negative pole of speaker, left 1
CH 2+ = positive pole of speaker, right 1
CH 2− = negative pole of speaker, right 1
CH 3+ = positive pole of speaker, left 2
CH 3− = negative pole of speaker, left 2
CH 4+ = positive pole of speaker, right 2
CH 4− = negative pole of speaker, right 2
5.4 Stereo bridge operation
In this operating mode, channels 1 and 2 and
channels 3 and 4 are bridged (fig . 6) . Therefore,
they provide higher power than a single channel .
Set the switches (8) on the rear panel of the
unit as follows:
SUBWOOFER /
LINK 2 + 4 MODE B LINK 1 + 3
CROSSOVER
–
BRIDGE 3+4 SOLO OTHER
Switch positions for stereo bridge operation
= switch unlocked, = switch locked, – = without function
5.4.1 Inputs
Connect the output of the line source (e . g .
preamplifier, mixer, etc .) to the inputs of the
amplifier:
Connect the left channel to the input jack CH 1
and the right channel to the input jack CH 3 .
The XLR jacks (12) or the 6 .3 mm jacks (13) can
be used as inputs . The inputs CH 2 and CH 4 are
not connected .
5.4.2 Outputs
The amplifier is able to operate two speakers or
two speaker groups . In bridge operation, the
minimum impedance of the speakers or the min-
imum total impedance of the speaker groups
must be 8 Ω and the minimum power capability
500 W RMS . Connect the speakers or speaker
groups to the output jacks (14):
CH 1+ = positive pole of speaker, left
CH 2+ = negative pole of speaker, left
CH 3+ = positive pole of speaker, right
CH 4+ = negative pole of speaker, right
5.5 Mono bridge operation
In mono bridge operation (fig . 7), channels 1 and
2 and channels 3 and 4 are bridged . Therefore,
they provide higher power than a single channel .
Furthermore, all channels receive the same input
signal . Set the switches (8) on the rear panel of
the unit as follows:
SUBWOOFER /
LINK 2 + 4 MODE B LINK 1 + 3
CROSSOVER
–
BRIDGE 3+4 1 OTHER
Switch positions for mono bridge operation
= switch unlocked, = switch locked, – = without function
5.5.1 Inputs
Connect the line signal source (e . g . preampli-
fier, mixer, etc .) to the input jack CH 1 . The XLR
jack (12) or the 6 .3 mm jack (13) can be used
as input .
The inputs CH 2, CH 3, and CH 4 are not
connected .
LINK 1 + 2 MODE A
–
BRIDGE 1+2
Table 6
LINK 1 + 2 MODE A
–
BRIDGE 1+2
Table 7
9