MPA-200 Stereo PA Amplifier  (320-3003)   Operation    Faxback Doc. # 14634

TURNING POWER ON

1.  Turn on the audio source equipment (such as a mixer or a preamplifier)
    connected to the amplifier's input jacks.

2.  Set the amplifier's LEFT and RIGHT OUTPUT LEVEL GAIN controls to their
    minimum levels.

3.  Set POWER 0/1 to 1 to turn on the amplifier.

USING THE POWER METER

The position of the meter's pointer indicates the output power.  The
meter's built-in lamp lights to make the meter easy to see in dark areas.

USING THE METER RANGE SELECTOR

When output power is too strong, the meter's pointer might continuously
swing to the extreme right and damage or reduce the accuracy of the meter.
To protect the meter, you can use the METER RANGE selector to control the
amplifier's sensitivity to the input power signal.  Push in METER RANGE to
maintain a 0 dB gain for the meter.

When output power is not strong, leave the METER RANGE switch in the out
position to allow a 20 dB gain.

USING THE LEFT AND RIGHT OUTPUT LEVEL GAIN CONTROLS

Rotate OUTPUT LEVEL GAIN clockwise to increase, or counterclockwise to 
decrease the output power.  To get the best performance with the least
sound distortion, always adjust OUTPUT LEVEL GAIN so the meter's pointer
does not continuously exceed the extreme right of the meter's scale.

CAUTION:  You can overdrive the amplifier by setting OUTPUT LEVEL GAIN
          too high.

USING THE CLIP CIRCUITRY

Continuous excessive output power can distort the sound, cause a thermal
overload, and damage equipment.  The special CLIP circuitry protects the
amplifier and your speaker system from being damaged by overdriving power.

Under normal conditions, the amplifier's clip indicator flickers as the 
output power briefly exceeds the level as set by the output level gain
selector.

However, under excessive output power conditions, the clip indicator lights
steadily to alert you as the special clip circuitry turns on.  When this
happens, simply rotate the appropriate output level gain control counter-
clockwise to reduce the output power level.

USING THE A/B SPEAKERS SWITCH

You can push in either SPEAKERS A or SPEAKERS B, one at a time, to listen
to only the desired channel (A or B) speakers.  Or, you can push in both 
SPEAKERS A and SPEAKERS B at the same time, to listen to all the speakers.

Push out SPEAKERS A or SPEAKERS B or both to disable the speakers on one
or both channels.

Caution:  If you speaker's impedance is 4-ohms, do not use both the 
SPEAKERS A and SPEAKERS B terminal at the same time.


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