Loudspeaker Line Monitoring - Impedance
From Zenitel Wiki
Impedance monitoring continuously measures the AC impedance of a loudspeaker line to verify the integrity of both the cabling and the connected loudspeakers. During commissioning, the amplifier records the current impedance of the circuit and continuously compares future measurements against this reference. Any significant increase or decrease in impedance indicates a potential fault, such as an open circuit, short circuit, or disconnected loudspeaker.
This is achieved using the EOLZ01 End-of-Line device, which is installed at the end of the loudspeaker circuit, which allows the entire loudspeaker line to be monitored and provide reliable fault detection beyond simple cable continuity.
Key Points
- Loudspeaker line is monitored based on the impedance values present during commissioning.
- Commissioned in the ADT (Amplifyer Dynamic Tool) of the SCT (System Configuration Tool)
- Can be affected by temperature drift or the presence of audio on the line.
- Lightly loaded loudspeaker lines may not detect individual loudspeakers becoming disconnected.
- The tuned load is the device. When using the EOLZ01 tuned load, the last loudspeaker is reliably monitored
- Cabling distance considerations for correct operation (refer to datasheet).
- Doesn't require capacitors in loudspeakers so suitable for retrofit.
- Does not require blocking capacitors.