7.5
Indicators
Figure 13. Front panel indicators
The two bottom green "ON" LED's indicate when the power supply and
output stage is operating correctly.
The "-40 dB" LED's illuminate when the output signal is greater than -40dB.
0dB is referenced to full output power. These LED's also act as signal
present indicators.
The ''Clip/limit'' LED indicates when the amplifier output is clipping or
limiting. It has two different indication states:
* When the clip limiter is engaged it has a short time constant and
illuminates briefly.
* When the clip limiter is not engaged it has an increased time constant and
illuminates for a longer period.
The remaining yellow "Protect" LED's indicate if the temperature or VHF
protection circuits are activated. These are described on page 17.
Martin Audio – MA4.2 Power Amplifier
E
NGLISH
16
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