3
The Flex amplifiers provide audio signals to system speaker circuits. The Flex Amplifier is offered
in two versions, the Flex-35 and the Flex-50. Functionally, both amplifiers behave identically but
the Flex-50 is capable of supplying an additional 15W of power over the 35W version. The
maximum available output from the Flex-50 and Flex-35 is 50W and 35W, respectively. The load
may be configured in any way so long as the maximum power output limit is not exceeded. Both
amplifiers provide dual-channel capability with internal backup functionality. (All Flex Amplifiers
described in this publication are listed in the next two sections.)
Note: The following Product IDs or PIDs (example: 4100-1212/1261) are not
compatible with the Constant Supervision Notification Appliance Circuit (CSNAC)
option.
• 4100-1212/1261 Analog Flex-50/Flex-35 Amp (25 VRMS)
• 4100-1213/1262 Analog Flex-50/Flex-35 Amp (70 VRMS)
• 4100-1226/1263 Digital Flex-50/Flex-35 Amp (25 VRMS)
• 4100-1227/1264 Digital Flex-50/Flex-35 Amp (70 VRMS)
Figure 1. Flex Amplifier without CSNAC Compatibility
For LED descriptions, see the “LED Indications” section at the end of this document.
Continued on next page
Introduction to the Flex Amplifiers
Overview
Flex Amplifiers Not
Compatible with
CSNAC Option
SPEAKER CIRCUIT TERMINAL BLOCK (TB1)
POWER STAGE 2
FAIL SWITCH (SW2)
and
POWER STAGE 1
FAIL SWITCH
(SW1):
To test backup audio
switching, press and
hold switch until OUT
TBL LED illuminates
(20 seconds).
COMM TROUBLE
LED (LED1)
NAC/POWER
STAGE LEDs
(LED 8-10): LED ON
when NAC is routed
to PS2
NAC STATUS
LEDs (LED 5-7): LED
ON when NAC is ON
or in trouble
OUTPUT 1
TROUBLE LED
(LED4)
ADDRESS/BAUD
RATE DIP SWITCH
(SW3)
INPUT TROUBLE
LED (LED2)
XNAC/CLASS A
ADAPTER
HEADER (P5)
PS2_FAIL
PS1_FAIL
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General