Loopdrive – User and installation manual
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1.2. Main functionality
Architecture of Loopdrive system allows you to create loudspeaker line in closed-loop topology with extra side-spurs
called T-Branches. The loop as well as every single T-Branch are constantly monitored and searched for any
abnormalities in the load and cabling.
Picture 1. Loudspeaker loop monitored by Loopdrive.
Loopdrive catches multiple faults independently for different loudspeaker lines. It handles also multiple faults at the
same time for the same loudspeaker line, regardless the type of the fault.
Following types of faults are detected by Loopdrive:
a. every short-circuit on loudspeaker line immediately after it’s occurrence with audio recovery within 4
seconds;
b. open-loop fault on the main loop;
c. open of the T-Branch (with EOL resistor enabled);
d. earth leakage on the main loop;
e. earth leakage of the T-Branch (with EOL resistor enabled);
f. amplifier disconnected.
NOTE:
For the purpose of line monitoring Loopdrive generates DC voltage on the entire loudspeaker line (including T-Branches), therefore each
loudspeaker on the line has to be equipped in series with DC blocking capacitor. Loudspeaker without a capacitor will be seen as a short-
circuit on the loudspeaker line.
Typical Loopdrive duty cycle is shown on picture below: