Bosch EVB-BA100 Installation Manual
EVB-BA-100
Backup
Audio Interface
(replacement for EVX-BA)
The EVB-BA-100 provides a means to switch in a backup amplifier in the event of a primary amp failure. One
backup amp can be provided in reserve for several primary amps. Amplifier outputs are connected at TB2,
and speaker field wiring at TB1. Supervisory and 24 VDC power inputs are provided at TS1. The LED onboard activates when the backup amp has been switched in. All wiring is power-limited. Mounts to
snaptrack or insulating nylon standoffs.
The EVB-BA-100 is compatible with both 25VRMS and 70VRMS audio signals.
INSTALLATION:
Mounting: The EVB-BA-100 is mounted in the same cabinet that houses the primary amplifier. It is designed
to be mounted into standard 3” snap track material. The board also has mounting holes at the corners for
stand-off mounts where necessary.
Fig. 1 - Board
TB1:
Ter. 1 - Ckt. Neg
Ter. 2 - +24 VDC
Ter. 3 - Gen Input
Ter. 4 - +24 VDC
TS1
4 3 2 1
LED
SPECIFICATIONS:
Power: 24 VDC
Current: 40 mA Standby
10 mA Active
TB1:
Ter. 1 & 2 - Audio Output
TB2:
Ter. 1& 2 - 25/70 VRMS Audio
Input from backup amplifier
Ter. 3&4 - 25/70 VRMS Audio
Input from primary amplifier
JUMPERS:
J1: jumps TS1-2 to TS1-4
LED 1:
ON: backup audio switched in
TB1
J1
1
+
-
1
2
BA-100
2
3
+
4
-
TB2
P/N B-5030 Rev. C
Page 1 of 2
130 Perinton Parkway, Fairport, NY 11450
Customer Service: (800) 289-0096
Technical Support: (888) 886-6189
Fig. 2 - Typical Connection Detail
LED activates when
backup audio is switched in
Installing the J1 jumper
eliminates the wiring
betweenTS1-#2 and TS1-#4
Speaker Output
25 / 70 VRMS
Primary
amp EOLR
Ground faults are indicated at 10K
impedance or less.
FROM PRIMARY AMP
TB-2
TB-3#7TB-2
#10
TS1
4 3 2 1
LED
J1
+
-
TB1
#1
+
-
+
-
NOTE:
If primary amplifier is an
EVX-25, EVX-50, or EVX-100
place dipswitch #5 on SN-2
of that amp DOWN
If primary amplifier is an
EVX-25E, EVX-50E, or EVX-100E
place dipswitch #5 on SN-1
of that amp DOWN
Backup amp EOLR
(installs at last EVB-BA)
25/70 VRMS Input from
backup amp (TB-1 #5-6)
25/70 VRMS Input from
primary amp (TB-1 #5-6)
TB2
BA-100
Field wiring connections:
#6-32 wire clamp screw 14-18 AWG
#8-32 wire clamp screw 12-18 AWG
Horizontal wire entry terminal 18-26 AWG
Wire gauge determined by circuit load
P/N B-5030 Rev. C
Page 2 of 2
130 Perinton Parkway, Fairport, NY 11450
Customer Service: (800) 289-0096
Technical Support: (888) 886-6189
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