Ecler MPA 4-400R - Manual (Page 13)

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4.5. Indicators
The SP signal presence indicators (3, 6, 8, 11) light up when the input signal reaches
approximately -40dBV.
The CLIP indicators (2, 5, 9, 12) light up when the output signal for the speakers is -1,5dB below
the actual clipping threshold. This clipping system watches for eventual supply voltage variations, thus
giving always an accurate clipping indication, regardless of mains voltage deviations. It is normal that
when operating at high output power, the CLIP indicators light up in synchronisation with the low
frequencies, which carry the most energy. Nevertheless, you should avoid that the CLIP indicators are lit
continuously.
Thermal protection indicator “TH” (13), it shines when the cooling tunnel temperature reaches 90ºC.
The amplifier will automatically restart when the temperature lessens to 80ºC.
5. CLEANING
The front panel should not be cleaned with dissolvent or abrasive substances because
silk-printing could be damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid
soap; dry it with a clean cloth. Be careful that water never gets into the amplifier through the holes of the
front panel.