Manual Amplificador Radio Shack

32-2003.fm Page 1 Tuesday, March 28, 2000 10:45 AM

Please read before using this equipment.

Owner’s Manual

MPA-125 100-Watt PA Amplifier

32-2003.fm Page 2 Tuesday, March 28, 2000 10:45 AM

ˆ Contents
Features .................................................................................................................................. 3
Preparation.............................................................................................................................
Presetting the Controls ......................................................................................................
Presetting Audio Input Devices ..................................................................................
Presetting the Amplifier..............................................................................................
Mounting the Amplifier ......................................................................................................
Placing the Speakers ........................................................................................................

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Connections............................................................................................................................ 5
Connecting Input Sources ................................................................................................. 5
Connecting Microphones ........................................................................................... 5
Connecting a Turntable.............................................................................................. 6
Connecting an Auxiliary Sound Source ..................................................................... 7
Connecting the MIX BUS Jack ................................................................................... 7
Connecting an Equalizer............................................................................................ 7
Connecting the Speakers .................................................................................................. 8
Determining Total Speaker Impedance ...................................................................... 8
Preparing the Speaker Wire ....................................................................................... 9
Connecting Only OneSpeaker .................................................................................. 9
Connecting Two Speakers In Series .......................................................................... 9
Connecting Two Speakers In Parallel ...................................................................... 10
Connecting Four Speakers In Series/Parallel Combination..................................... 10
Connecting Speakers with Transformers ................................................................. 11
Connecting Power ........................................................................................................... 12
Using Your Amplifier ........................................................................................................ 12
SafetyIndicators ............................................................................................................. 13
Monitoring the Sound Sources ........................................................................................ 13
Listening Safely ....................................................................................................... 13
Using an Equalizer.......................................................................................................... 13
Using the Feedback Filter ............................................................................................... 14
Troubleshooting ................................................................................................................... 15
Care and Maintenance...