GAIN CONTROLS
Turn the Gain controls clockwise to increase Gain and
counterclockwise to decrease Gain.
LED INDICATORS
Displays
The LED displays for each channel operate as follows:
Typical Power Up, Operation, Power Down Behavior
When the amplifier is first turned on, the green POWER displays will light up , and there will
be a 2 secondturn-on delay, during which all red LEDs will be bright (PROTECT and CLIP).
If a channel will not come out of muting, it may be responding to an excessive high frequency
level at the input . Turning down the Gain controls (before you power up the amp is best)
allows the muting to release, and is always a good idea to prevent an unexpected input signal
from overdriving the load.Signal Level will be shown as the green Signal Present, -20dB and
the yellow -10dB display illuminate with increasing signal level .
When the amplifier is turned off, muting should be virtually instantaneous, with all red LEDs
illuminated until the power supply discharges.
CLIP is illuminated at full brightness
when the output is muted
(PROTECT LED is on, too).
If CLIP is illuminated at less than
full LEVEL display, the load is
shorted or abnormal. PROTECT
may flash, too.
CLIP flashing at full LEVEL display
indicates the amp hasreached full
power (clipping) and the limiter is
acting to prevent severe overdrive.
A steady CLIP glow after the
flashing PROTECT display has
started indicates the onset of
thermal limiting.
PROTECT flashes as the amplifier
approaches max temperature.
Full brightness plus flashing
indicates thermal muting.
Not Illuminated
Full Brightness
Variable or
Occasional Flashing
Flashing
Full Bright
& Flashing
Key to LED representations:
ON/OFF MUTING
OVERHEATING
SHORTED LOAD
CLIPPING
THERMAL MUTING
LED Displays During
Abnormal Operating Conditions
NO SIGNAL
SIGNAL PRESENT (-25 dB)
SIGNAL PRESENT (-10 dB)
SIGNAL PRESENT (-5 dB)
CLIPPING
LED Displays
During Normal Operation
CLIP Red
ATIVE
Green Main power supply active on this channel.
Shows activity of Limiting circuit, which responds
to both clipping and to thermal overload.
Protect Red Flashes as amplifier approaches
maximum temperature.Illuminated steadily plus
flashing during thermal
Summary of Contents for MC Series
Page 1: ...MC MC404 M PRO...
