Hacousto Holland bv
Industrieweg 87
2651BC Berkel & Rodenrijs
4Evac SW6 / SW6-LITE INSTALLATION and USER
GUIDE V04
Author:
TC
Page 8 of 26
5.2.1
EOL module
Loudspeaker lines must be equipped with an EOL module in order to be under stable surveillance.
EOL boards are not supplied with 4ESW6 and are available at 4EVAC as separate product.
SW6 supports surveillance of loudspeaker lines based on impedance measurement @ 20 kHz.
For reliable monitoring of speakerline use EOL board. Connect EOL board to the end of the
loudspeaker line in parallel, preferably inside the last loudspeaker on the line. EOL is not polarity-
sensitive.
Loudspeaker line with EOL module
NOTE
: EOL module features a 145°C thermal fuse, minimizing the risk of line short-
circuit under fire conditions. Exposing EOL board to temperatures exceeding 145°C will
damage EOL circuit and cause open fault of the loudspeaker line.
The purpose of EOL is to create reference load at the monitoring frequency 20kHz. With 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
more reliable fault indication when a large number loudspeakers is placed on one long line.
5.2.2
EOL measurement calibration
Once the loudspeaker lines are connected and EOL boards mounted at the end of every line, you
can calibrate EOL measurement to currently detected impedance value @20kHz. As result of
calibration the reference impedance value is saved for every line to the internal memory of SW6.