SilentKnight EVS - Manual (Page 38)

EVS Series Emergency Voice System Installation Manual
4-16 LS10062-001-SK-E
High frequency noise, such as that produced by the inductive re-actance of a speaker
or bell, can also be reduced by running the wire through ferrite beads or by wrapping
it around a ferrite toroid core. Figure 4-16 provides an example.
Figure 4-16 Wire Routing Example for EVS-50W
4.5.4 Speaker Wiring
Each EVS-50W supplies four NAC (Notification Appliance Circuit) for speaker
connection. The speaker circuit can be supervised and wired Class B (Style Y) or
Class A (Style Z). The speaker circuit is capable of 50 watts of power at 25 Vrms or
70.7 Vrms.