A-B System Principle
This article describes the principle behind A-B systems.
Exigo is designed to meet the requirements of A-B systems. This is used to enhance redundancy and in many projects, this is a required feature.
The main principle behind an A-B system is that a critical fault should not reduce audio coverage in a given area.
Complete A-B System
A complete A-B system consists of two complete PA systems that work together as one system.
Both systems will have a System Controller and a number of amplifiers.
Usually these two systems are placed in two different locations. So if one of the locations for example catches fire, the system in the other location will still be working.
A-B System principle:
All the areas will have speakers from both System A and System B.
So if one of the system fails, you will still have audio coverage in all areas.
A-B Speaker Wiring
To ensure audio coverage in an area, the speakers will be wired from both System A and System B:
If you, for example, have a hallway with ceiling speakers, every other speaker will be wired back to System A and the rest back to System B, i.e. Speakers 1,3,5... to System A and Speakers 2,4,6... to System B.
If one of the system fails, you will still have audio coverage in the hallway.
A-B Wiring in Single System
It is also possible to use A-B wiring on a single system.
This is done by wiring the speakers in an area from two different amplifiers.
Then, if one of the amplifiers fails, you will still have audio coverage in the area.
