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  5. Owner's Manual

Radio Shack 32-2001 Owner's Manual

Manual is about: 20-Watt PA Amplifier

Summary of 32-2001

  • Page 1

    Owner’s manual please read before using this equipment. Mpa-40 20-watt pa amplifier 32-20 01.Fm page 1 fr id ay, februar y 4, 2 000 7 :53 am.

  • Page 2: Contents

    2 ˆ contents features ................................................................................................................... 3 preparation .............................................................................................................. 4 presetting the controls ..............

  • Page 3: Features

    3 ˆ features your radioshack 20-watt pa amplifier gives you 20 watts of solid power for your pa system. Its wide frequency re- sponse easily handles amplification of voice and music. It operates on either 120 volts ac or 12 volts dc power so you can use it anywhere you want to de- liver special anno...

  • Page 4: Preparation

    4 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 control...

  • Page 5: Speakers

    5 phono/aux/cd switch — select the input source. Even if you connected auxiliary equipment to both the phono and aux/cd input jacks, you can use only one source at a time. Speaker push terminals — press the appropriate tab to open a terminal. In- sert the end of a speaker wire into the opening, then...

  • Page 6

    6 3. Touch the positive end of a 1.5-volt flashlight battery to the speaker ter- minal that does not have the wire attached to it. 4. Touch the negative end of the bat- tery with the lose end of the wire attached to the other speaker termi- nal. Note the direction of the cone movement — inward or ou...

  • Page 7

    7 • if you connect more than two speak- ers using only series or only parallel connections, the total impedance might exceed the amplifier’s maxi- mum impedance (16 ohms) or fall below its minimum impedance (4 ohms). For example, if you connect four 8- ohm speakers: –in series, the total impedance i...

  • Page 8

    8 you can make the correct connection. The total impedance of all the speakers must match one of the amplifier’s output terminals ( 4 Ω , 8 Ω , or 16 Ω ) . Speakers in series 1. To determine the total impedance of speakers connected in series, add the impedance of all the speakers. For example, if y...

  • Page 9

    9 if you connect four 8-ohm speakers in series, the total impedance is 32 ohms (8 + 8 + 8 + 8 = 32). This exceeds the maximum rating. If you connect these speakers in paral- lel, the total impedance is 2 ohms (8 ÷ 4 = 2). This falls below the minimum rat- ing. You can arrive at a proper total imped-...

  • Page 10

    10 you need a separate transformer for each speaker. Line transformers have several connec- tors called taps. The primary taps (on one side of the transformer) are the inputs and are rated in watts. The secondary taps (on the op- posite side of the transformer) are the outputs and are rated in ohms....

  • Page 11: Controls and Operation

    11 3. Connect a wire from the speaker’s positive (+) terminal to the trans- former’s secondary tap that matches the speaker’s total imped- ance (4, 8, or 16 ohms). 4. Connect a wire from the speaker’s negative (–) terminal to the com tap on the transformer’s secondary side. ˆ controls and operation ...

  • Page 12: Troubleshooting

    12 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. Be sur...

  • Page 13: Care and Maintenance

    13 ˆ care and maintenance to enjoy your amplifier 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. • handle the amplifier gently and carefully. Don’t drop it. • keep the amplifier away from dust...

  • Page 14: Specifications

    14 ˆ specifications output power at 1 khz, 10% thd ............................................................................... 20 watts thd at 1w, 1 khz low-pass filter mic1 .............................................................................................................................

  • Page 15: Notes

    15 ˆ notes 32-2001.Fm page 15 friday, february 4, 2000 7:53 am.

  • Page 16

    32-2001 811081640b 02a00 printed in china radioshack a division of tandy corporation fort worth, texas 76102 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 ...