7
UNDERSTANDING YOUR ME580
ME Amplifiers Melbourne, Australia
3.
DC Offset Monitoring
Each amplifier output channel is continuously monitored for DC offset to eliminate the possibility of
speaker damage due to DC currents. On power up, the outputs remain disconnected from the
speakers until there is no DC offset present. During normal operation, the amplifier will shut down if
DC is detected on any output.
4.
Voltage Limiting / DC Monitoring
Each amplifier output channel is continuously monitored for voltage limiting of the output signal,
which can occur when momentary high amplitude peaks of the input signal cause the amplifier to
exceed the limit of its undistorted output capability. If voltage limiting is sustained for more than a
very brief period, the distortion will be audible. The monitoring circuit can also detect ‘clicks’ or brief
DC events in the output. The amplifier will shut down if sustained voltage limiting or DC is detected.
5.
High Level High Frequency Output Monitoring
Each amplifier output channel is continuously monitored for excessive high frequency output, and if
detected the amplifier will be shutdown to protect the loudspeakers.
6.
Output Status Indication
A Multifunction Status light on the front panel escutcheon, labeled “FAULT” indicates the status of the
output monitoring circuitry as follows:
OFF
- Amplifier operating normally
RED (steady) -
Amplifier shutdown, due to either DC offset, sustained Voltage
Limiting or excessive High Frequency output.
RED (pulse or flash) - Momentary Voltage Limiting or DC Event detected on output.
Note: If the STATUS light pulses or flashes repeatedly, the volume setting on the preamplifier should
be reduced to a point where the pulsing or flashing stops. Depending on the recording level of the
particular program material (e.g. CD) being played, different volume settings may be needed to
prevent voltage limiting,
7.
Amplifier Operating Status Indication
A status light located behind the ME logo on the front panel escutcheon indicates the operating status
of the amplifier, as follows:
AMBER (steady)
-
Power available, amplifier is in Standby Mode.
AMBER (flashing) -
Power available, amplifier has been switched OFF less than
one minute after being switched ON. Amplifier cannot be
switched ON until flashing stops.
BLUE
-
Amplifier is ON
MAUVE
-
Initial Power up Self Test in progress.
8.
Control of Brightness of the Operating Status Light
The brightness of the BLUE Operating Status Light located behind the ME logo on the front panel
escutcheon may be varied to suit individual preference and ambient lighting conditions. To adjust the
brightness, when switching ON the amplifier manually, press
and hold
the POWER button. After 2
