Setting up Line Monitoring

This article will explain how to setup Line Monitoring on the speaker line on ENA Amplifiers.
Exigo has two ways of monitoring the speaker line/loops.

• Self Protection, no settings required.
• Active Line Monitoring with pilot tone. This requires setup in EMT and on the ENA Amplifier.

Self Protection

There is two mechanisms that are used for self protection:

• Short on the line. If the speaker line is shorted the amplifier will shut down.
• High temperature. Before the amplifier shuts down it will first reduce the audio by 6 dB. If the temperature keep on rising it will eventually shut down.

Active Line Monitoring

Each ENA amplifier can be independently monitored for impedance changes. This is used to detect fault such as load change, open/short and ground faults.

• Load Change:

- Exigo considers a change of more than 15% a load change. This is done to prevent false fault reports due to variations in temperature, speaker loop configurations etc. Can be individually turned on or off.

• Open:

- If more than 90% of the load is removed Exigo will detect the line as open.

• Short:

- A large load change indicating a large additional load will be considered a short.

• Ground fault:

- Any ground fault will be detected. Can be individually turned on or off.

EMT Configuration

In the device tree go to ENA amplifier(s) -> Audio Lines -> LET and Line monitoring