4E-EOL/10 End Of Line module

4EVAC voice evacuation systems support surveillance of loudspeaker lines based on 20 kHz impedance

measurement.

The purpose of the 4E-EOL is to create reference load at the monitoring frequency of 20kHz. With the EOL

connected, monitoring of load impedance is more accurate and less sensitive to slow and long-term

impedance drift of the loudspeakers due to aging and weather conditions. It also gives the most reliable

fault indication when a large number of loudspeakers is connected to a long line.

4E-EOL is required for reliable impedance monitoring of a loudspeaker line. Connect the EOL board to the

end of the loudspeaker line in parallel, preferably inside the last loudspeaker on the line.

In order to prevent short-circuits caused by accidental electrical contact with sharp edges of the metal

housing, the 4E-EOL board must be placed in the supplied insulating sleeve for installation.

The EOL is not polarity-sensitive.

NOTE: The EOL module features a 135°C thermal fuse, minimizing the risk of a line short-circuit under fire

conditions. Exposing the EOL board to temperatures exceeding 135°C will damage the EOL circuit and

cause an open fault of the loudspeaker line.