9
English
fixing the amplifier safely. In addition, use the
mounting straps at the rear to screw the amplifier 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 insulating 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 speakers 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 transmission 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:
LINK 2 + 4 MODE B LINK 1 + 3
SUBWOOFER /
CROSSOVER
LINK 1 + 2 MODE A
SOLO STEREO SOLO
OTHER SOLO STEREO
Switch positions for individual operation Table 3
= switch unlocked, = switch locked
5.1.1 Inputs
Connect the line signal sources (e. g. preamplifier, 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 impedance 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
SUBWOOFER /
CROSSOVER
LINK 1 + 2 MODE A
2 STEREO 1
OTHER
1 STEREO
Switch positions for the channel group mode Table 4
= switch unlocked, = switch locked
5.2.1 Inputs
Connect the line signal source (e. g. preamplifier, 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 impedance 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
5.3 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
SUBWOOFER /
CROSSOVER
LINK 1 + 2 MODE A
2 STEREO 1
OTHER SOLO STEREO
Switch positions for stereo parallel operation Table 5
= switch unlocked, = switch locked
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 impedance 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, 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:
LINK 2 + 4 MODE B LINK 1 + 3
SUBWOOFER /
CROSSOVER
LINK 1 + 2 MODE A
–
BRIDGE 3+4 SOLO
OTHER
–
BRIDGE 1+2
Switch positions for stereo bridge operation Table 6
= 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 minimum 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:
LINK 2 + 4 MODE B LINK 1 + 3
SUBWOOFER /
CROSSOVER
LINK 1 + 2 MODE A
–
BRIDGE 3+4 1
OTHER
–
BRIDGE 1+2
Switch positions for mono bridge operation Table 7
= switch unlocked, = switch locked, – = without function
5.5.1 Inputs
Connect the line signal source (e. g. preamplifier, 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.