ECC-50/125DA Instruction Manual —
P/N LS10027-000FL-E:D 5/21/2015
21
Installation
ECC-125DA Remote Amplifier
2.1.5 Audio Riser Wiring
The Audio Riser is an analog voice bus that carries the recorded voice messages from the display
board to the ECC-125DAs, or the voice messages generated from a system microphone to the ECC-
125DAs. The maximum resistance on the Audio Riser is 20
Ω
.
Connect the Audio Riser from TB22 on the main control board to the ECC-125DAs as shown in
Figure 2.6.
OU
T
–+
IN
–+
BA
+
–
SB
U
S
OUT
–+
IN
–+
BA
+
–
SB
US
ECC-125DA
ECC-125DA
To next
ECC-125DA
ECC-50/100
main control board
Supervised,
Power-limited
UL-listed 15K
Ω
ELR at last panel
on Audio Riser
Figure 2.6 ECC-125DA Audio Riser Wiring
125
da
au
di
ow
ire.w
m
f
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