User Manual: NEO System
45
Rev.0.3
Figure 47 - Speaker Lines, AB Mode
4.6.3 Supervision of Speaker Connections
Every speaker connection is supervised independently. There are two complementary ways to
do it: Measuring line impedance and end of line devices. Using the impedance of the line, the
devices emits a signal periodically every 30 seconds, at a non-audible frequency. Consequently,
in a complementary way, to increase the measure of precision of an open circuit, the end of line
devices are used (see 4.6.4), to detect the injected signal at the end of the speaker line. If the
measure in inside the expected values, a signal is sent to the control system.
For a correct measure of the speaker connections, the system must be calibrated using
configuration application in the following cases:
•
It switches on for the first time.
•
Some changes are taking place in the connected speakers, such as:
o
Some units have been added.
o
Some units have been reduced.
o
The adjustment settings of one or various units have been changed.
o
The model of one or various speakers have been changed.
To disable the measurement of loudspeaker lines or the end of line devices, use the
configuration application.
NOTE: Impedance measurement is not compatible with installed attenuators in the line, due to
this, they will modify the impedance of the line in a non-lineal way.
4.6.4 End Of Line Devices
Figure 48 - End Of Line Device
