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LB20 Premium Subwoofer
5.2
Transformer input panel - optional accessory
5.2.1
Mono operation
Caution!
For mono operation only use either the first two pins or the last two pins of the FR/IN
!
connector. Do not wire the amplifier to all four pins.
May cause damage to the amplifier if connected improperly.
The amplifier, the subwoofer, and the speakers are wired for MONO operation. It is highly
advisable to support the unit while these connections are being made. Connect all wires to
the speaker at the back terminal plate observing proper polarity of the connections. After all
connections are made test the complete system operation.
The speakers must be set to 70V/100V mode.
A: STEREO/MONO switch set to mono.
Figure 5.1: Mono configuration 1
Bosch Security Systems B.V.
Fault
Signal/Clip
CH1 CH2 CH3
CH4
A
Installation manual
Wiring | en
17
2018.07 | 02 | F.01U.345.356
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