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13
Input Mode Switch
The Input Mode Switch, which is located on the Rear
Panel of the MC312, allows
selection of either the Balanced
or Unbalanced Input. Refer to
figure 12.
Auto Off Switch
The MC312 incorporates Power Save Circuitry to
automatically place the MC312 into the power saving
Standby Mode approximately 30 minutes after there
has been an absence of an audio input signal.
When there is a Power Control Connection be-
tween the MC312 and a Preamplifier with Power Save
Circuitry, the AUTO OFF Switch is bypassed (located
on the Rear Panel of the MC312). Refer to figure 13.
In the event there is no
Power Control Connection
and the Power Save Circuit-
ry is activating inappropri-
ately relative to your specific
use of the MC312, place the
AUTO OFF Switch in the DISABLE position.
Note: If the Power Save Circuitry has switched Power
to the MC312 OFF, place the POWER in the OFF
Position and then in the ON position to reset the
circuitry.
Power On
To have the MC312 automatically turn On or Off
when a Preamplifier or A/V Control Center turns On
or Off, rotate the power switch to
the Remote position. For man-
ual operation, rotate the power
switch to the On or Off position
as desired. Refer to figure 9.
Note: There must be a power
control connection between
the MC312 and the Audio
Preamplifier (or A/V Con-
trol Center), in order for the remote power turn-on
to function.
Meter Selection
Rotate the meter mode switch to select the meter
operation mode you desire.
Refer to figures 10 and 11.
Lights Off - Meter lights
are turned off
and the meter
will continue
to indicate
the power
output.
Note: When
Power Control Input of the MC312
is connected to an Audio Preampli-
fier or A/V Control Center with
Remote Meter Illumination Control,
the Meter Illumination will auto-
matically be remotely controlled
(On/Off) with the METER Switch
set to the WATTS or HOLD posi-
tion.
How to Operate
How to Operate
Figure 9
Figure 10
Fig u re 11
Figure 12
DISABLED
Figure 13
DISABLED
Watts- The meters respond to all the musi-
cal information being produced by the
amplifier. They indicate to an accuracy
of at least 95% of the power output with
only a single cycle of a 2000Hz tone
burst.
Hold - The meter pointer is locked to the high-
est power peak in a sequence of peaks.
It is electronically held to this power
level until a higher power peak passes
through the amplifier. The meter point-
er will then rise to the newer higher
indication. If no further power peaks
are reached, the meter pointer will
very slowly return to its rest position
or lower power level. The decay rate is
approximately 6dB per minute.
Note: The MC312 Power Output Meter
indicates the actual power delivered
to the loudspeakers by responding
to the combination of current and
voltage output.
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