Redundancy using DPU and NXANP
Introduction
Power amplifier redundancy can be achieved using DPU and LOAD3 GPIO mode 6 and 7. DPU is used as a power switch,
able to route the audio power signal from the backup amplifier to the correct speakers when a normal amplifier has failed.
The maximum ratio of backup and normal amplifiers is 1:5. Each DPU communicate with normal NXAMPs through RS232
serial port.
GPIO informs the backup amplifier if a normal amplifier has failed and whether or not the backup amplifier is free. The
backup amplifier recalls a “scene” or “user preset” that contains a copy of all the parameters and preset of the failed
amplifier. One “scene” or “user preset” has to be created for every normal amplifier in a redundant system, and saved in
the backup amplifier’s memory space from 00 to 04.
DPU is used in reverse within a redundancy system. Meaning that power signals from normal NXAMPs are connected to the
front DPU’s connectors and outputted to the speakers using the DPU’s back connectors.
GPIO cables are not delivered by NEXO. If you wish to set up a redundant power amplifier system, you can make
your own GPIO cable using standard DB25 MAL PLUG KIT. Please follow the instructions below for signals and power
cabling.
The audio signal will be restored about 3 sec. after a normal amplifier failure.
Power Input
Power Output
Backup Power Input
