Radio Shack MPA-50 Owner's Manual
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Radio Shack MPA-50 Owner's Manual

40-watt pa amplifier
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Owner's Manual
Please read before using this equipment.

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Summary of Contents for Radio Shack MPA-50

  • Page 1 Owner’s Manual Please read before using this equipment.

  • Page 2: Table Of Contents

    32-2002.fm Page 2 Friday, February 11, 2000 11:36 AM ˆ Contents Features ... 3 Preparation ... 4 Presetting the Controls ... 4 Choosing a Location ... 4 Placing the Speakers ... 4 Making Connections ... 5 Speakers ... 6 Speaker Phasing ... 6 Determining Total Speaker Impedance ...

  • Page 3: Features

    32-2002.fm Page 3 Friday, February 11, 2000 11:36 AM ˆ Features Your RadioShack MPA-50 40-Watt PA Amplifier gives you 40 watts of solid power for your public address (PA) sys- tem. The built-in three-band equalizer enables you to tailor the sound to fit your environment.

  • Page 4: Preparation

    32-2002.fm Page 4 Friday, February 11, 2000 11:36 AM ˆ Preparation PRESETTING THE CONTROLS Warning: A sudden high output from the amplifier could damage your hearing or the speakers connected to the amplifi- er’s output. To avoid accidentally overdriving a channel or prematurely amplifying an audio input, set all the amplifier’s front- panel controls to their lowest settings.

  • Page 5: Making Connections

    32-2002.fm Page 5 Friday, February 11, 2000 11:36 AM ˆ Making Connections Important: Connect all auxiliary equipment and speakers before connecting power. PHONO L (Left) and R (Right) Input Jacks — Connect a turntable with a magnetic cartridge. To avoid distortion, do not connect a high-level audio input source to these jacks.

  • Page 6: Speakers

    32-2002.fm Page 6 Friday, February 11, 2000 11:36 AM ˆ Speakers SPEAKER PHASING Phasing is the direction the speaker cone moves with reference to the polari- ty of the connection wires. Proper phas- ing is important when you use more than one speaker in the same room or area.

  • Page 7: Connecting Speakers

    32-2002.fm Page 7 Friday, February 11, 2000 11:36 AM determine if your speakers are connect- ed in series, parallel, or series/parallel combined. Note: We recommend that you use speakers that are rated the same (for example, all 8-ohm speakers) for all se- ries or parallel connections.

  • Page 8: One Speaker

    32-2002.fm Page 8 Friday, February 11, 2000 11:36 AM One Speaker Connect the speaker’s negative (–) ter- minal to the amplifier’s (common) terminal. Then connect the speaker’s positive (+) terminal to the amplifier’s terminal that matches the speaker’s im- pedance. For example, if you have an 8- ohm speaker, connect the speaker’s positive terminal to the amplifier’s 8-ohm terminal.
  • Page 9 32-2002.fm Page 9 Friday, February 11, 2000 11:36 AM Speakers in Parallel Two 8 Speakers 1. To determine the total impedance of speakers connected in parallel, divide impedance speaker by the number of speakers. For example, if you want to connect two 8-ohm speakers in parallel, divide 8 (the impedance of one speaker) by 2 (the number of speak-...

  • Page 10: Multiple Speakers With Transformers

    32-2002.fm Page 10 Friday, February 11, 2000 11:36 AM 4. To determine the total impedance of speakers connected in serial and parallel combined, divide the imped- ance of one pair of speakers by the number of pairs. For example, if you want to connect four 8-ohm speakers in serial and parallel combined, divide 16 (the impedance of one pair of speakers)
  • Page 11 32-2002.fm Page 11 Friday, February 11, 2000 11:36 AM Cautions: • Before you connect the speakers, be sure the total wattage of the primary taps you intend to use does not exceed the amplifier’s maximum 40-watt output power rating. • Avoid multiple connections to the amplifier’s Follow these steps to make the connections.

  • Page 12: Controls And Operation

    32-2002.fm Page 12 Friday, February 11, 2000 11:36 AM ˆ Controls and Operation MICROPHONE 1 and 2 Inputs — Con- nect any standard dynamic microphone with a -inch plug. POWER Switch and Indicator — Press the bottom half of the switch to turn on the amplifier.

  • Page 13: Troubleshooting

    32-2002.fm Page 13 Friday, February 11, 2000 11:36 AM ˆ Troubleshooting If you should run into difficulties, check the wiring of the system. Are there any short circuits in the speaker wiring? Have you provided adequate ventila- tion? Did you calculate speaker imped- ance correctly? Be sure microphones and connecting cables are not defective.

  • Page 14: Care

    32-2002.fm Page 14 Friday, February 11, 2000 11:36 AM ˆ Care To enjoy your MPA-50 40-Watt PA Am- plifier for a long time: • Keep the amplifier dry. If it gets wet, wipe it dry immediately. • Use and store the amplifier only in normal temperature environments.

  • Page 15: Specifications

    32-2002.fm Page 15 Friday, February 11, 2000 11:36 AM ˆ Specifications Output Power at 1 kHz, 10% THD ... 40 Watts Power Bandwidth at 1W, 10% THD, Auxiliary Input ... 70 Hz–20 kHz THD at 2W, 1 kHz MIC1 ... 1% MIC2 ...
  • Page 16 32-2002.fm Page 16 Friday, February 11, 2000 11:36 AM Limited One-Year Warranty This product is warranted by RadioShack against manufacturing defects in material and workman- ship under normal use for one (1) year from the date of purchase from RadioShack company-owned stores and authorized RadioShack franchisees and dealers.

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