MPA-45  (320-2035)         Using your Amplifier        Faxback Doc. # 15701

Before you use your amplifier, be sure you choose a proper location.  Avoid
placing the amplifier near a heat source such as a vent, radiator, and so
on.  Also, be sure there is adequate ventilation.  For example, avoid
placing the amplifier on thick carpeting.  Doing so can restrict the air
flow.

Follow these steps to use your amplifier.

1.  Set MASTER VOLUME and the mixing controls (MIC 1, MIC 2, and 
    AUX/PHONO) to 0.

2.  Press in POWER.  The POWER indicator lights.

3.  If you connected a sound source to the PHONO or AUX input jacks, set 
    the AUX/PHONO switch to the proper position.

Note:  A phonograph and an auxiliary source can be connected at the same
       time, but you can operate only one of these devices at a time.

4.  Start the sound source.

5.  Set MASTER VOLUME to 10.  Then adjust the mixing controls (MIC 1, 
    MIC 2, and AUX/PHONO) for the desired volume and balance.

6.  Adjust the FREQUENCY EQUALIZER controls to adjust the sound level for 
    three different frequency ranges (150 Hz - low sounds, 1 kHz - middle 
    sounds, and 6 kHz - high sounds) within +12/-12 dB.  At the center 
    position, the sound is not affected.

    After you get the desired sound, adjust MASTER VOLUME as desired.

Caution:  Be careful not to raise the volume level too high.  Doing so
          might cause the system to overload.

7.  When you finish using the amplifier, press POWER to turn off the 
    amplifier.

Using the Priority Terminals

You can connect any SPST (single-pole, single-throw) switch to the
amplifier's PRIORITY terminals.  Activating this switch gives priority to 
the MIC 1 input and disables all other inputs.  This is ideal for paging 
or making announcements.

You can use normal two-conductor wire up to 200 feet-60 m long to connect 
the SPST switch.  Your local Radio Shack/Tandy store sells several SPST 
switches and the appropriate wire for this connection.  Refer to the
switch's owner's manual for specific connection instructions.


(SP/all-06/28/95)