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Power Outputs – AUDIO TRANSFORMER OUTPUTS
The two integrated output transformers convert the power amplifier’s nominal output voltage to the
commonly used loudspeaker line voltage standards – 25 V, 70 V, and 100 V. These voltages are
simultaneously present at the correspondent floating outputs of the binding post strip. The two power
amplifier channels can be operated using any possible output voltage combination. Simultaneous
operation of low impedance loudspeaker systems and floating loudspeaker lines on a single power
amplifier channel is possible as well.
Caution It is possible that during operation shock-hazard output voltages can be present at the
power output connectors (>34 V peak value). Therefore, the connected loudspeaker
lines have to be installed in accordance to applicable security standards and regulations.
When installing and operating 100 V-loudspeaker networks, compliance to the VDE
regulation DIN VDE 0800 is mandatory.
Especially, if a 100 V-loudspeaker network is included in alarm system applications, all
security standards have to be in accordance to the security class 3 standard. Before the
first operation of the power amplifier, the loudspeaker terminal strip has to be covered
using the supplied protection cover.
Power Outputs - Isolated Outputs 70 V and 100 V
To reduce line attenuation effects when the distance between power amplifier and loudspeaker systems
exceeds 50 meters, it is recommended to employ loudspeaker systems with 100 V or 70 V line
transformers, which also allows conveniently distributing the output power to the individual loudspeaker
systems.
It is possible to connect as many loudspeaker systems until the total power consumption of the
loudspeaker network equals the nominal power handling capacity of the power amplifier; while not
declining the nominal load impedance of the power amplifier outputs.
For details on nominal power handling capacity and nominal load impedance of the amplifier’s individual
power outputs, please refer to the specifications in the appendix.
figure: example configuration – DPA 4260 with 100 V loudspeaker systems – maximum load
using 30 W / 100 V and 60 W / 100 V loudspeaker systems
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