HOW TO CONNECT AC POWER
The MC300 is designed to operate on 120 volts 50/60 Hz. Plug the AC power cord directly
into a wall outlet or into an AC power control strip. Make certain that the AC power outlet
used has at least 12 amperes capacity available. Turn on the MC300 power by turning the
front panel POWER switch to on.
You can also turn the MC300 power on with a Power Control signal from an accessory
Mclntosh component or Control Center that includes a Power Control Out. Plug the MC300
power cable into a live AC outlet. Connect a data cable from the accessory component Power
Control OUT to the MC300 Power Control IN and set the POWER switch to OFF-REMOTE.
When the accessory component turns on, it will send a control signal to the amplifier caus-
ing it to turn on.
FUSE (10A-250V SLO BLO)
CAUTION: For continued protection against fire hazard, replace only with the same type
10A-250V SLO BLO fuse.
POWER OUTPUT METERS
The MC300 power output meters respond 95% full scale to a single cycle of a 2.000Hz
tone burst. Both voltage and current are electronically measured and fed to a special circuit
that accelerates the pointer movement in the upward direction. When the meter pointer reaches
its peak, it is time stretched to pause just long enough to be read, and then drops.
The upper scale on the meters is calibrated in average watts power, and the lower scale
in decibels. The meter calibration marks reading from right to left, starting at the 300 watt
indication, are as follows:
300
120
60
30
12
6
3
1.2
0.6
Watts Indicated
(Indicated)
(Indicated)
0.3
0.12
0.06
30
12
6
3
1.2
0.6
(Indicated)
Milliwatts (Indicated)
(Indicated)
Two additional calibration marks above 300 watts are on the meters. The first is 600 watts,
( + 3dB), and the second is 1200 watts, ( + 6dB). The power amplifier cannot produce a con-
tinuous 1200 watts of power, but can produce well beyond 300 watts on program peaks,
especially into lower impedance speaker loads.
In MONO operation the two meters will read identical power levels. The total mono power
output of the amplifier will be the sum of these readings.
METER WATTS/HOLD
In the METER WATTS position, the meters respond to all the musical information being
produced by the amplifier and read to an accuracy of at least 95% of the power output of
either amplifier channel.
In the METER HOLD position, the meter pointer is locked to the highest power peak in
13
HOW
TO
CONNECT
OUTPUTS
FRONT
PANEL
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