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Manual Radio Shack MPA-40

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  • Radio Shack MPA-40 - page 1

    Owner’s Manual Please read before using this equ ipment. MPA-40 20-Watt PA Amplifier 32-2001.fm Page 1 Friday, February 4, 2000 7:53 AM ...

  • Radio Shack MPA-40 - page 2

    2 ˆ Contents Features ......... ................ ................ ................ ................. ................ ................ ......... 3 Preparation ....... ................ ................ ............. ................. ................ ................ ......... 4 Presetting th e Controls ................ ................. .......... ...

  • Radio Shack MPA-40 - page 3

    3 ˆ Features Your RadioShack 20-Watt PA Amplifier gives you 20 watts of solid power for your PA system. Its wide frequen cy re- sponse easily handles amplification of voice and music. It operates on eithe r 120 volts AC or 12 volts DC power so you can use it anywhere you want to de- liver special announcement s or pl ay mu- sic with great sound. I ...

  • Radio Shack MPA-40 - page 4

    4 ˆ Preparation PRESETTING THE CONTROLS Warning: A sudde n high out put from the amplifier could dama ge your hearing or the speakers conn ected to the amplifi- er’s output. To avoid accidentally overdr iving a channel or premat urely amplifying an audio input, se t all the amplifier’s front- panel controls to their lowest set tings. To avoid ...

  • Radio Shack MPA-40 - page 5

    5 PHONO/AUX/CD Switch — s elect the input source. Even if you connected auxiliary equipment to both the PHONO and AUX/CD input jacks, you can use only one so urce at a time . Speaker Push Termina ls — press the appropriat e tab to open a ter minal. In- sert the end of a spea ker wire into the opening, then rele ase the tab to close the termina ...

  • Radio Shack MPA-40 - page 6

    6 3. T ouch the positive end of a 1 .5-volt flashlight batt ery to the speake r ter- minal that does no t have the wire attached to it. 4. T ouch the negative end of the bat- tery with the lose end of the wire attached to the other speak er termi- nal. Note the direc tion of the cone movement — inward or outward. 5. If the spea ker cone moves out ...

  • Radio Shack MPA-40 - page 7

    7 • If you connect more t han two speak- ers using only se ries or only parallel connections, t he total impedance might exceed the am plifier ’s maxi- mum impedance (1 6 ohms) or fall below its minim um impedan ce (4 ohms). For example, if y ou connect fo ur 8- ohm speakers: –In series, the tota l impedance is 32 ohms (8 + 8 + 8 + 8 = 32). T ...

  • Radio Shack MPA-40 - page 8

    8 you can make the correct connecti on. The total impedance of all the speakers must match one of the amplifier’s out put terminals ( 4 Ω , 8 Ω , or 16 Ω ) . Speakers in Series 1. T o determine the total impeda nce of speakers connecte d in series, add the impeda nce of all the speakers. For example, if you want to co nnect two 8-ohm spea k ...

  • Radio Shack MPA-40 - page 9

    9 If you connect fou r 8-ohm speaker s in series, the total imp edance is 32 ohms (8 + 8 + 8 + 8 = 32). This exceeds the maximum rating. If you connect th ese speakers in paral- lel, the total impeda nce is 2 ohms (8 ÷ 4 = 2). This falls below the minimum rat- ing. You can arrive at a pro per total imped- ance by combining series and parallel conn ...

  • Radio Shack MPA-40 - page 10

    10 You need a separa te transformer for each spea ker. Line transformer s have several connec- tors called taps. The primary t aps (on one side o f the transformer) a re the inputs an d are rate d in watts. The secondary taps (on the op - posite side of t he transforme r) are the outputs and ar e ra te d in oh m s. Cautions: • Before you connect ...

  • Radio Shack MPA-40 - page 11

    11 3. Connect a wire fr om the speaker ’s positive (+) terminal t o the trans- former’s secondary tap that matches the speaker ’s total imped- ance (4, 8, or 16 oh ms). 4. Connect a wire from the speaker ’s negative (–) te rminal to the COM tap on the transfor mer ’s seco ndary side. ˆ Controls and Operation MICROPHONE 1 and 2 Inputs ? ...

  • Radio Shack MPA-40 - page 12

    12 ˆ T roubleshooting If you should ru n into difficulties, che ck the wiring of the system. Are the re any short circuits in th e speaker wirin g? Have you provided adequate ventila - tion? Did you calculate speaker imped- ance corr ectly? Be sure microphon es and connecting cables are not defective. Be sure you ar e using large enoug h speaker w ...

  • Radio Shack MPA-40 - page 13

    13 ˆ Care and Maintenance To enjoy yo ur amplifie r for a lon g time: • Keep the a mplifier dry . If it get s wet, wipe it dry immediately . • Use and store the amplifier only in normal tem perature environments. • Han dle the amplifier gently and carefully . Don’t drop it. • Keep the amplifier away from dust and dirt. • Wipe the ampli ...

  • Radio Shack MPA-40 - page 14

    14 ˆ Specifications Output Power at 1 kHz, 10% THD ................. ................ .............. ................. .............. . 20 W atts THD at 1W , 1 kHz Low-Pass Filter MIC1 .......... .............. .............. .............. .............. .............. .............. .............. .............. .... 1% MIC2 .......... ......... ...

  • Radio Shack MPA-40 - page 15

    15 ˆ Notes 32-2001.fm Page 15 Friday, February 4, 2000 7:53 AM ...

  • Radio Shack MPA-40 - page 16

    32-2001 81 10816 40B 02A00 Printed in China RadioShack A Division of Ta ndy Corporation Fort Worth, Texas 76102 Limited One-Y ear Warranty This product is warranted by RadioShack against manufactu ring defects in material and workman- ship under normal use for one (1 ) year from t he da te of pu rchase from Radi oSha ck compan y- owned stores and a ...

Manufacturer Radio Shack Category Stereo Amplifier

Documents that we receive from a manufacturer of a Radio Shack MPA-40 can be divided into several groups. They are, among others:
- Radio Shack technical drawings
- MPA-40 manuals
- Radio Shack product data sheets
- information booklets
- or energy labels Radio Shack MPA-40
All of them are important, but the most important information from the point of view of use of the device are in the user manual Radio Shack MPA-40.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Radio Shack MPA-40, service manual, brief instructions and user manuals Radio Shack MPA-40. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Radio Shack MPA-40.

Similar manuals

A complete manual for the device Radio Shack MPA-40, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Radio Shack MPA-40 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Radio Shack MPA-40.

A complete Radio Shack manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Radio Shack MPA-40 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Radio Shack MPA-40, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Radio Shack MPA-40, that we can find in the current document
3. Tips how to use the basic functions of the device Radio Shack MPA-40 - which should help us in our first steps of using Radio Shack MPA-40
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Radio Shack MPA-40
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Radio Shack MPA-40 in a specific country, if it was not possible to solve the problem on our own.

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