Radio Shack 32-2054 Manuale utente

Thank you for purchasing the RadioShack 40W AC/DC PA

Amplifier. It gives you the versatility and power you need in a

professional sound system. Your amplifier’s wide frequency

response easily handles amplification of voice and music. Use it in

meeting halls and auditoriums, at sports events, in schools, and in

theofficeforpagingsystems-anywhereyouneedtodeliverspecial

announcements with excellent sound.

OWNER’S MANUAL —

Please read before using this equipment.

www.radioshack.comSM

RadioShack and RadioShack.com

are trademarks used by

RadioShack Corporation.

32-2054

+/2146#06

If an icon appears at the end of a paragraph, go to the box on that

page with the corresponding icon for pertinent information.

— Caution ±— Note

Microphone Rotary Volume

Controls - lets you adjust the

microphone level (see Page 15).

Rotary MASTER Volume

Control - lets you adjust the

overall soundlevel (See Page 15

On/Off Rocker Switch with LED

Indicator - lights to indicate power is

turned on (See Page 15).

Phones Jack - lets you connect

headphones so you can hear the

mixed audio in privacy (See Page 16).

MIC 1 and MIC 2 Input Jacks

- let you connect up to two

dynamic microphones (See

Page 6).

Phono/Aux Rotary Volume Control - lets

you adjust the volume of the turntable or

auxiliary sound source (See Page 15).

100 Hz/1kHz/8kHz Tone Controls -let you

enhance the sound or tailor the high,

midrange,andlowfrequenciesforeachaudio

source input to the acoustics of a particular

performance environment (See Page 15).

Output Power Level LED

Indicator -letsyoumonitorand

control the output power level

(See Page 15).

Front View of Amplifier

Ground Screw - connect the

ground wire (black or green) to

thisscrewtoavoidlow-frequency

hum.

Mix Bus Jack - connects extra

amplifierformultipleaudiosource

(See Page 7).

AC IN - supports other music

instrument/amplifierpowerwith

maximum load of 100W (See

Page 14).

Phono to AUX/CD Slide

Switch - selects turntable

or auxiliary CD sound

source (See Page 6).

COM/4Ω/8Ω/16Ω/70V Speaker

Connectors - let you easily connect

speakerwiresdirectlytotheamplifier

after the total speaker impedance is

determined (See Page 9).

Phono Jacks - let you

connect a turntable (See

Page 6).

AUX/CD Input Jack - lets you

connect a variety of audio input

sources for music and special

effects (See Page 6).

DC 5A/12V Input Jack -lets

you power the amplifier from a

12V vehicle battery source

(See Page 15).

Rear View of Amplifier

Preparation

24'2#4#6+10

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Before you use your amplifier, be sure to place it on

a location with adequate ventilation. Do not put it on

thick carpeting (which can restrict air flow) or near a

heat source, such as a heat vent or radiator (which

can cause it to overheat).

2.#%+0)6*'52'#-'45

Speaker placement depends on your room’s size

and arrangement. We recommend you play a

wide-range recording and experiment with speaker

placement until you find the locations that result in

the best sound. For the best results, point the

speakers in toward the listeners, especially if you

place the speakers far apart so their coverage

areas overlap to prevent dead spots (areas not

covered by the speaker’s sound). Position the

speakers slightly above the level of the listeners’

heads and besure you have determined the correct

speaker impedance (see “Connecting the

Speakers” on Page 7).

24'5'66+0)6*'%10641.5

Before you begin making connections or using your

amplifier, preset the audio input sources’ and

amplifier’s controlsto avoid overdriving a channel or

producing loud sounds.

%106'065

Preparation ............................ 4

Placing the Amplifier .......... 4

Placing the Speakers ......... 4

Presetting the Controls ...... 4

Connections .......................... 5

Connecting Input Sources... 5

Connecting the Speakers.....7

One Speaker...................9

Two Speakers in Series..9

Two Speakers in

Parallel ..........................10

Series/Parallel Comb. ...11

Speakers w/Transform..12

Connecting Power ............... 15

Connecting the DC Jack....15

Replacing the DC

Power Cord’s Fuse ............15

Operation ............................. 15

Monitoring Sound.............. 15

Listening Safely ................ 15

Troubleshooting ................... 16

Care ..................................... 17

Service and Repair .............. 17

Specifications ...................... 18

Accessories...........................19

Connections

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Set the audio input sources’ controls to these levels.

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Warning: To prevent possible hearing loss, set the

amplifier’s controls to the settings shown below.

After you turn on the amplifier or change the

program source, set the controls to a comfortable

listening level.

%100'%6+105

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You can connect optional components, such as

microphones, tuners, turntables, or CD players to

your amplifier to expand your system. To prevent

hum and other noise, use low-capacitance shielded

cable. Your local RadioShack store carries a wide

selection of audio components and connecting

cable.

Audio Device Control Setting

Turntable Power Off

Tape Deck Power Off

CD Player Power Off

Amplifier

Receiver Power

Tone Off

Flat

Control Setting

Power Out

MIC 1, MIC 2, PHONO/AUX MIN

100 Hz, 1 kHz, 8 kHz 0dB (mid position)

MASTER VOLUME MIN

Connections

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You can connect one dynamic microphone

(not supplied) to MIC 1 and another to MIC 2 using

a 1/4” (6.35 mm) plug.

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You can connect a low level audio input source,

such as a magnetic cartridge turntable, to the

amplifier’s Land R PHONO jacks. With this

connection, set the PHONO and AUX/CD selector

switch to PHONO.

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You can connect any high-level sound source, such

as a CD player, tape deck, or tuner, to the

amplifier’s AUX/CD jack.

MIC 1 MIC 2

AUX/CD Jack

Connections

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You can connect another MP-40 amplifier to this

jack (shown on page 3) to double the size of your

PA system. This lets you use up to four

microphones and two turntables

(or two auxiliaries) sound sources.

Use a shielded cable with phono plugs at each end

to connect the amplifier. Connect the cable between

the two amplifiers’ MIX BUS jacks. For the best

results, use the most appropriate cable length.

%100'%6+0)6*'52'#-'45

You can connect one or more 4-, 8- or 16-ohm

speakers to the amplifier, with or without

transformers. To ensure equal volume from each

speaker, all the connected speakers should have

the same impedance rating.

Proper phasing is important when you use more

than one speaker in the same room or area.

Out-of-phase speakers can lose up to one-half of

their potential volume, and can have a significantly

decreased bass effect ±.

Most speaker terminals are color-coded or have a

mark that indicates the terminal’s polarity. Usually,

terminals with positive polarity are red or have a

plus (+) symbol, and terminals with negative polarity

are black or have a minus (-) symbol. Phasing is

correct when you connect +to +and -to -.

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Before you connect speakers to the amplifier, you

must determine the total speaker impedance. 

To determine total speaker impedance, you must

first decide if you are connecting the speakers in

series, parallel, or a series/parallel combination.

%#76+10

• A total speaker impedance

higher than 16 ohms or

lower than 4 ohms can

damage your amplifier.

• When determining the total

speaker impedance, first

determine whether you are

connecting the speakers in

series, parallel, or a series/

parallel combination.

±016'±

Properphasingoccurswhen

speakers are set to allow

sound to flow in the same

direction.

Connections

Important: If you are connecting more than two

speakers in series only or parallel only, be sure the

total impedance does not exceed the amplifier’s

maximum impedance (16 ohms) or fall below the

minimum impedance (4 ohms). You can achieve a

proper total impedance by combining series and

parallel connections ±.

24'2#4+0)6*'52'#-'49+4'

Use the shortest length of wire possible to connect

the speakers. After placing the speakers in the

desired location, determine the wire length and

choose the appropriate gauge size.±

• Use a wire stripper

(not supplied) to remove

about half-inch of

insulation from the end

of the speaker wire.

• Then, attach a wire

connector

(not supplied) and twist

the exposed wire to

secure all of the wire

strands.

• To connect the speaker wire to the amplifier,

press down the appropriate push terminal lever

on the amplifier and insert the end of the wire into

the terminal’s hole. Then, release the lever to

secure the wire.

Wire Length Wire Gauge

25 feet or less 18-gauge

Over 25 feet 16-gauge

±016'±

If you connect speakers

without transformers, the

speaker wire should be no

longer than 50 feet (See

“Connecting Speakers

with Transformers” on

page 13). Wire Stripper

±016'±

For the best results when

connecting speakers

(in series or parallel), only

use speakers having the

same impedance.

Wire

Connector

Connections

%100'%6+0)10'52'#-'4

Connect the speaker’s negative (-) terminal to the

amplifier’s COM terminal. Then, connect the

speaker’s positive (+) terminal to the speaker

terminal (4 Ω, 8 Ω, or 16 Ω) that matches the

speaker’s impedance.

%100'%6+0)69152'#-'45+0

5'4+'5

Speakers are connected in series when the first

speaker’s positive terminal is connected to the next

speaker’s negative terminal.

• Determine the total speaker impedance of

speakers you want to connect in series by

adding up the individual impedances of all the

connected speakers.

For example: If connecting two 4-ohm

speakers in series, your total speaker

impedance is 8 ohms.

Speaker Terminals

Connections

Follow these steps to connect speakers in series.

1. Connect the first speaker’s positive terminal to

the other speaker’s negative terminal.

2. Connect the first speaker’s negative terminal to

the amplifier’s COM terminal.

3. Connect the other speaker’s positive terminal

to the amplifier’s terminal (4 Ω, 8 Ω, or 16 Ω)

that matches the total speaker impedance.

%100'%6+0)69152'#-'45+0

2#4#..'.

Speakers are connected in parallel when all

speakers’ negative terminals are connected

together and all their positive terminals are

connected together.

• Determine the total speaker impedance of

speakers you want to connect in parallel by

dividing the impedance of one speaker by the

number of speakers.

For example: If connecting two 8-ohm

speakers in parallel, divide 8 (one speaker’s

impedance) by 2 (number of speakers). Your

total speaker impedance is 4.

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