External Connections; Connect The Backup Power Supply; Connecting Line Input And Loop-Through - Bosch PLENA LBB1938/30 Installation And Operation Manual

12 en | External connections
6

External connections

6.1

Connect the backup power supply

The power amplifier has a 24VDC input (8) screw terminal to connect a backup power supply.
You must connect an earth (9) to the unit to increase the electrical stability of the system.
Figure 6.1: Backup power supply
6.2

Connecting line input and loop-through

The power amplifier has a balanced line input for connection to a pre‑amplifier or a mixer. Use
the loop‑through connection to connect the power amplifier to another power amplifier if
more power is needed. Each power amplifier must be connected to its own set of
loudspeakers. Do not connect power outputs to each other.
Use program line input 2 (4) and line loop‑through 2 (6) for normal operation without priority.
Figure 6.2: Line input and loop‑through
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PLENA power amplifiers
Bosch Security Systems B.V.