GAI-Tronics SP2, Manual, Page: 10 / 23

Pub. 42004-783L2C
SP2 Remote Subset/Speaker Amplifier Station Page 8 of 20
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-783L2C.docx
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70 V / 100 V Termination Board Option—
Speaker Connections with Monitoring
The optional 70V/100V Speaker Line
Monitoring PCBA replaces the standard
termination board and provides for connection
of 70-volt and/or 100-volt speakers to the SP2
Station. Terminal block
TB1 provides
termination for the station’s speaker loop(s).
All speakers must be wired in parallel. One
speaker loop can be monitored by terminating
the return cable to the
L
INE
S
PRVN
terminals on
TB2 (see Figure 4, Figure 6, and Table 2).
1. Pull the 70 volt and/or 100 volt speaker
cable(s) into the enclosure.
2. Connect spade lugs to the wires.
3. Connect 100-volt speakers to the 100V and
COM terminals on TB1 . Connect 70-volt
speakers between the 70V and COM
terminals on TB1 .
Two sets of terminals exist for the 70 V and
100 V speaker loops providing termination
for additional speaker loops.
N
OTE
: An SP2 station can only monitor
one speaker loop.
4. For speaker line supervision, connect the
speaker return wires to the
L
INE
S
PRVN
+
and – terminals at TB2 (see Table 4).
5. Torque the terminal block screws to 8–10
in·lb (0.90–1.13 N·m).
N
OTE
: The combined wattage (tap settings) for
all speakers must never exceed the
amplifier power rating (24 W).
Table 2. 70 V/100 V Speaker Connections—TB1
Pin Label Description
TB1-1
100V
100 V Parallel Speakers—Output
TB1-2 COM Earth Reference
TB1-3 70V 70 V Parallel Speakers—Output
TB1-4 100V 100 V Parallel Speakers—Output
TB1-5 COM Earth Reference
TB1-6 70V 70 V Parallel Speakers—Output
Figure 6. 70 V/100 V Termination Board Wiring