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figure 2 LF cable for coupling two amplifiers DPA 41xx
5. Outputs
5.1 POWER OUTPUT
The power output is balanced and off-ground potential. The output is factory-configured for the connection of 100V
loudspeaker systems. Connection has to be performed by inserting the supplied 5-pole plug into the power output
socket (17). Switching the output voltage to 70V, 50V or to low impedance operation (4 ohms) is possible using the
plug-in bridge B411 on the printed board assembly 84187 (DPA 4120) respectively 84175 (DPA 4140) (see also
paragraph 7).
figure 3 connection of the power output
5.2 POWER OUTPUT for 100V (70V or 50V) loudspeaker systems
If the distance between the amplifier and the loudspeakers exceeds 50 m, it is recommended to operate the
speaker systems using 100V matching transformers, to reduce line attenuation. This additionally offers a simple
way of distributing the output power capacity. In this way it is possible to connect a maximum of as many
loudspeaker systems as it takes until the total power consumption of the entire speaker network equals the power
output capacity of 200W (connection impedance 50 ohms) with the DPA 4120, respectively 400W (connection
impedance 25 ohms) with the DPA 4140. Connection is performed using the 100V output (17) (see also figure 3).
In a few special cases it is also possible to operate the loudspeaker systems with 70V or 50V output voltage (see
also paragraph 7).
Caution It is possible that during operation shock-hazard output voltages can be present at the POWER
OUTPUT connector (>34V peak value). Thus, the connected loudspeaker groups have to be
installed in accordance to applicable security standards and regulations (see also paragraph 8.5.2).
5.3 SINGLE CALL and obligatory reception relays OVERRIDE BYPASS
Combined with the PROMATRIX manager DPM 4000 or other external controls it is also possible to transmit single
or collective calls with obligatory reception; i. e. bridging of possibly existing volume controls of the loudspeaker
systems. For details on how to connect the outputs, please refer to figure 3; for the connection of relays, please
refer to paragraph 5.6 respectively the PROMATRIX handbook.
5.4 POWER OUTPUT for low impedance loudspeaker systems
Switching the output to 4 ohms allows the connection of low impedance loudspeaker systems (4-16 ohms) (see
also paragraph 7 and figure 3). Because of the occurring line attenuation, the distance between amplifier and
loudspeaker system should not exceed 50m. Please make sure that the overall loudspeaker impedance does not
decline a value of 4 ohms and that the stated power handling capacity of a single speaker system is not exceeded.
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