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4.3. Indicators
The “SP” signal presence indicators (2, 5, 8, 11 on the MPA4-80 and 2, 5, 8, 11, 14, 17 on
the MPA6-80) light up when the input signal reaches approximately -40dBV.
The “CLIP” indicators (3, 6, 9, 12 on the MPA4-80 and 3, 6, 9, 12, 15, 18 on the
MPA6-80) light up when the output signal for the speakers is -1.5 dB 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
5. CLEANING
The control panel must not be cleaned with any dissolvent, abrasive or petroleum
derivate substance else paint and silk printing could be damaged.
Whenever cleaning should be necessary use a soft cloth slightly wet with water and
neutral liquid soap or with a solution of water and alcohol at 50%. Be careful that no liquid gets
into the mixer. Never use sharp or erosive objects to scratch the control panel.
Should any liquid get into the amplifier, do not use any cleaning sprays; send the unit
to the nearest ECLER Technical Service.
Summary of Contents for MPA4-80
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