Instruction manual
P84577 G
Sheet 3 of 14
OUT
IN
OUT
IN
OUT
IN
24 VDC
AUDIO
RS-485
ALARM
POWER TROUBLE
Z1
Z2
Z3 Z4
EX1
EX2
IN
CLASS
B
A
SW2
SP4-APS
JP1
NAC
CC
SW1
TB1
TB2
TB7
TB6
TB5
TB4TB3
JP1
Shorted = 70Vrms
Open = 25Vrms
D37
D32
D36
D35
D41
D33
D42
D43
D38
D34
D39
D40
D44
D45
When circuit is not used, jumper
negative to negative and positive
to positive.
Figure 3: “CLASS A” Zone Connections
Any unused “CLASS A” zone must be jumpered negative to negative and positive to positive. If the Expansion (EX1,
EX2) terminals are not used, jumpers are required
. See Figure 3.
3.1.2 “CLASS B” Audio Wiring:
When an installation requires “CLASS B” audio field wiring, the Addressable Paging Splitter module’s Class Selector
Switch (SW2) must be set for “CLASS B.” Note that end-of-line resistors (UL Listed 10K Ohm, EOLR) are
required at the end of each audio output zone even if no speakers are present on a zone. End-of-line resistors are
required on the EX1 and EX2 connections whether they are used or not. Figure 4 shows the SP4-APS set for CLASS B
audio field wiring:
The audio zone outputs are either 25Vrms or 70.7Vrms matching the audio input voltage. Remember, the SP40/2 has a
maximum audio output to the splitter of 40 watts, while the Audio Boosters have a maximum audio output to the SP4-
APS of 80 watts.
OUT
IN
OUT
IN
OUT
IN
24 VDC
AUDIO
RS-485
ALARM
POWER
TROUBLE
Z1
Z2
Z3 Z4
EX1
EX2
IN
CLASS
B
A
SW2
SP4-APS
JP1
NAC
CC
SW1
TB1
TB2
TB7
TB6
TB5
TB4TB3
JP1
Shorted = 70Vrms
Open = 25Vrms
D37
D32
D36
D35
D41
D33
D42
D43
D38
D34
D39
D40
D44
D45
EOLR
EOLR
EOLR
EOLR
EOLR
EOLR
All circuits are terminated with an
UL Listed 10K Ohm EOLR
Figure 4: “CLASS B” Zone Connections