A-B System Principle

This article describes the principle behind A-B systems.
Exigo supports an A-B system setup. This is used to enhance redundancy and in many projects, this is a feature that is required.

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:

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:

A-B Speaker Wiring Principle

If you for example have a hallway with ceiling speakers, every other speaker will be wired back to System A and every other back 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 a area from two different amplifiers.
So if one of the amplifiers fails you will still have audio coverage in the area.