Ecler GPA2-400ES User Manual

Contents

106.3. IndicatorsGPA2-400ES amplifiers include a simple yet effective indication system.CLIP/STBY indicators show the absence of loudspeaker output signal. These indicatorsmay light up for following reasons:1. During start-up, until the STANDBY time has passed. This time period is neededfor the internal operating voltages to settle.2. A short circuit is detected at the loudspeaker terminals (PROTECT function).3. The amplifier is outputting direct current or very low frequency signals that coulddamage the loudspeaker.In any case, should these indicators light permanently, this is a sign of malfunction andthe causes should be investigated.The CLIP/STBY indicators light up just before the actual clipping threshold at theloudspeaker output is reached. The clip detection circuit considers supply voltageoscillations, so that a dependable clip reading is achieved, even when operating withunstable mains voltage. It is usual that the CLIP/STBY indicators shine following thebass frequencies when the amplifier operates at high power levels, as these frequenciescarry the main energy. Take care that the CLIP/STBY indicators are not permanently lit.SP Signal Presence indicators indicate the presence of a valid signal at the amplifierinputs.The TH (THERMAL) indicator lights when the unit has entered the protection mode dueto excessive temperature; normal operation is recovered when the amplifier internaltemperature comes back down to regular operating levels.7. CLEANINGThe front panel should not be cleaned with dissolvent or abrasive substances becausesilk-printing could be damaged. To clean it, use a soft cloth slightly wet with water andneutral liquid soap; dry it with a clean cloth. Be careful that water never gets into theamplifier through the holes of the front panel.