GPI:
The GPI is used to change between two internal device presets. If the GPI 1 or GPI 2 is set to
GND potential, the preset is switched from the original selected preset to the preset set for
GPI 1 or GPI 2.
GPO:
The GPO is designed as a potential-free changeover switch (relay).
If power is on, GPO pin 3 and GPO pin 1 are shorted.
If the amplifier is turned off or a fault condition appears, GPO pin 3 and GPO pin 2 are
shorted.
Power outputs
L Series amplifier
Cabling with two Speakon-type connectors in Normal mode
The first possibility in Normal mode is to use the two Speakon-type connectors, whereas
speakers have to be connected to pins 1+ and 1– of the sockets. The correct connection is
also indicated at the amplifiers rear panel.
Figure 6.1: Normal mode
Bi-Amp cabling in Normal mode with Speakon-type connector
The second possibility for connecting the speakers when the power amplifier is operated in
Normal mode is to only use the Speakon-type connector CHANNEL A and to connect one
speaker cabinet to pins 1+ and 1–, as described above and the second cabinet to pins 2+ and
2–. Pins 2+ and 2– are only assigned at Speakon-type connector of CHANNEL A. Proceeding
like this facilitates the cabling of speaker systems that are used in active 2-way operation (Bi-
Amp). The correct connection is also indicated at the amplifiers rear panel.
Figure 6.2: Bi-Amp cabling in Normal mode
Speakon CHANNEL B Speakon CHANNEL A
1+ 1- Connector 1+ 1- 2+ 2-
B+ B- Signal A+ A- B+ B-
Table 6.2: Speaker connection using Speakon A and B connectors
6.9
6.9.1
20 en | Controls, indicators and connections
L Series and C Series FIR-Drive Power
Amplifiers
2017.10 | 02 | F.01U.327.801 Installation manual Bosch Sicherheitssysteme GmbH
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