Hacousto Holland bv
Industrieweg 87
2651BC Berkel & Rodenrijs
IMPACT reference system manual (Typical )
Author:
DD
Design revision:
2.0
4.4.10.
Loudspeaker lines
4EVAC Impact supports surveillance of loudspeaker lines based on 20 kHz impedance measurements.
For reliable impedance monitoring of the loudspeaker line, an EOL board must be used. Connect the EOL
board to the end of the loudspeaker line in parallel, preferably inside the last loudspeaker on the line. The
EOL is not polarity-sensitive.
NOTE: EOL boards are not supplied with the Impact and are available at 4EVAC as separate products.
Loudspeaker line with EOL module
The purpose of the EOL board is to create a reference load at the monitoring frequency of 20kHz. With the
EOL connected, the 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 a more reliable
fault indication when a significant number of loudspeakers is placed on one long line.
