ECS Series Emergency Communication System Installation Manual 151455
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4.8.5.3 Class A Speaker Configuration for ECS-Dual50W
Figure 4-62 illustrates how to wire speakers to the control panel using Class A wiring.
Figure 4-62 Class A Speaker Configuration
4.8.6 VBUS Wiring
The VBUS is an analog voice bus that carries the recorded voice messages from the ECS-VCM or
ECS-NVCM to the ECS-DUAL50Ws, or the voice messages generated from a system microphone to
the ECS-DUAL50Ws. The maximum resistance on the VBUS is 20Ω.
The ECS-DUAL50W supports two VBUS channels. The wiring method is the same for both channels.
VBUS1 and VBUS2 should never be wired together.
Connect the VBUS from the ECS-VCM to the ECS-DUAL50Ws as shown in Figure 4-63 and Figure 4-
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