Reference:
EST-xCtrLine-4
EST-xCTRLN-4 provides 4 independent speaker line outputs (A, B, C, D). The board allows you to switch between the main and spare amplifiers. Line measurement methods can be done by: Impedance module, loop or end of line (EOL). The measurement method is selected from the software settings. Provides fault detection, opening, ground leakage and watchdog amplifiers on common 100V buses.