Technical data

Chapter 4: Installation
Series SPB Audio Boosters Manual, Revision A
4-30
Table 4-3. Jumper/Switch/Variable Resistor Functions
Jumpers Name Description
JP1 Not Used Not Used
JP2 Not Used Not Used
JP3 Not Used Leave jumper in.
JP4 AC Loss Reporting Delay
Jumper in place – 30-
second delay in reporting AC Loss
trouble.
Jumper removed – 170-minute delay in reporting AC Loss
trouble.
JP5 Wheelock sync Disable
(SPB-80/4 only)
Jumper in place – Wheelock sync enabled.
Jumper removed –
Wheelock sync disabled. Pass
through sync or constant NAC enabled.
JP6 Not Used Leave jumper in.
JP7 Two-wire or Four-Wire Mode
Jumper in place – Two-Wire Mode.
Jumper removed – Four-Wire Mode.
JP8 Internal AUX RET EOLR
Jumper in place – Internal EOLR connected.
Jumper removed – No Internal EOLR connected.
JP9 External AC Reporting
Jumper in place – AC Loss reported on main trouble
contacts. Use when not reporting to off-site location.
Jumper removed – AC Loss reported only on ACTRB
contacts. Use when reporting to off-site location.
JP10 Not Used Leave jumper in.
J1 Audio 2 Output Voltage Select Output Voltage (25V or 70.7V).
J1A or J1B Audio 1 Output Voltage Setting Output Voltage (25V or 70.7 V).
J2 Audio 2 Power Limiter Setting Set to the same setting as J1.
J3 Audio 1 Power Limiter Setting Set to the same setting as J1A/J1B.
J4 Audio Input Setting Input Voltage (1V, 25V, or 70.7V).
Switches Name Description
SW1 Not Used Not Used
SW2 Strobe In NAC/CC Select
(SP80/2 Only)
Selects strobe input type 8-33VDC regulated NAC or
Contact Closure (CC). Switch depressed to the bottom for
CC.
SW3 Auxiliary In NAC/CC Select Selects auxiliary input type 8-33VDC NAC or Contact
Closure (CC). Switch depressed to the top for CC.
SW4 Not Used Not Used
Variable
Resistors
Name Description
R64 (LVL) Audio Input Volume Control Adjusts audio input volume.