112 DAA2 & DAX — P/N 53265:A1 8/24/2011
DAA Digital Audio Amplifiers Installation
Auxiliary Input A
Auxiliary Input A (AUXA) is intended for background music, and provides a high-fidelity
connection to common audio appliances such as a radio, CD player, or tape deck. Two-channel
stereo signals are changed to monophonic signals.
Figure C.21 AUX A Auxiliary Audio Input
Background music will be silenced while batteries greater than 26AH are being fully charged.
Auxiliary Input B
Auxiliary Input B (AUXB) is provided to accept low-level analog audio input at 12V
p-p
nominal,
15V
p-p
max. The messages are then transmitted out as high level audio to DAA speaker circuits as
designated by programming. VeriFire Tools programming determines if signal supervision of
AUXB is enabled.
Figure C.22 AUXB Auxiliary Audio Input
Speaker and Backup Circuits
Speaker circuits 1 through 4 (terminals 10 through 13) provide for two NFPA Class A (Style Z)
connections for high-level audio output, four NFPA Class B (Style Y) connections, or One Class A
and two Class B connections. These connections dynamically share the 50W or 75W output
capability of the DAA.
A DAA may be wired using the “BKIN” and “BKOUT” terminals to back up an amplifier. If an
amplifier fails, the signal automatically switches to the backup amplifier.
Radio, CD player,
portable audio
device, telephone
paging source, or
tape deck.
_
+
_
+
Left audio signal
Right audio signal
DAA
DAABRDtb9.wmf
TB9
Expected signal
strength from
Auxiliary Input:
1V
p-p
max.
Stereo input shown.
Monophonic input
may connect to
either AUXA R or
AUXA L.
14-18 AWG twisted-pair
recommended
DAA AUXB
AMG-1/ACT (Audio Coupling Transformer) Style Low Level Audio
TB 8
DVCAUXBtb14.wmf
14-18 AWG twisted-
pair recommended.
Low-level analog
audio output, 12V
p-p
nominal, 15V
p-p
max.
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