Radio Shack 32-2055 Bedienungsanleitung

Thank you for purchasing your 250-Watt •Stereo PA Ampliﬁer from

RadioShack. This PA gives you the versatility and power you need in a

professional sound system. Its wide frequency response easily handles

ampliﬁcation of voice and music. Use it anywhere you need to deliver

special announcements with excellent sound. It is perfect for meeting halls,

auditoriums, sporting events, schools, or in the ofﬁce for paging systems.

With a bridged speaker connection, the ampliﬁer can produce up to 350

watts of clean, powerful sound with minimum distortion.

32-2055

www.radioshack.com

PA Ampliﬁer

User’s Guide

Quick Start Guide

250-Watt • Stereo

PA Amplifier

What’s Included

ontents

Important Safety Instructions ............................................................................ 3

About Your Ampliﬁer ......................................................................... 6

Ampliﬁer Features.............................................................................................. 6

Ampliﬁer Setup............................................................................................ 10

Getting Started ................................................................................................. 10

Select a Location...................................................................................................10

Preset the Controls ............................................................................................... 10

Preset the Audio Input Source........................................................................... 10

Presetting the Ampliﬁer ..................................................................................... 10

Connecting Your Ampliﬁer................................................................................ 11

Connecting Input Sources.................................................................................... 11

Connecting Microphones ....................................................................................11

Connecting a Turntable........................................................................................ 12

Connecting an Auxiliary Sound Source ..............................................................12

Connecting the MIX BUS Jack............................................................................. 12

Connecting an Equalizer...................................................................................... 13

Connecting Speakers ...........................................................................................13

Determining Total Speaker Impedance............................................................14

Preparing the Speaker Wires ............................................................................. 14

Connecting Two Speakers in Series .................................................................. 15

Connecting Two Speakers in Parallel ................................................................ 15

Unbridged Connection ......................................................................................16

Bridged Connection ...........................................................................................16

Connecting Power ................................................................................................17

Operating Your Ampliﬁer............................................................................. 18

Beginning Steps ......................................................................................................18

Monitoring Sound Sources .................................................................................. 18

Listening Safely .....................................................................................................18

Using the Feedback Filter .................................................................................... 19

Using the Level Meters and Clipping Indicator .................................................19

Using Speaker A/B................................................................................................ 19

Additional Information................................................................................. 20

Care and Service .............................................................................................. 20

Replacing the Fuse ............................................................................................... 20

Troubleshooting.................................................................................................... 21

Speciﬁcations ........................................................................................................22

Do More with Your Ampliﬁer ........................................................................... 23

Important Safety Instructions

1. Read all safety and operating instructions before the appliance is used.

2. Keep all safety and operating instructions for future reference.

3. Follow all warnings on the appliance and in the operating instructions.

4. Unplug this appliance from the wall outlet before cleaning. Use only a damp

cloth for cleaning. Do not use liquid or aerosol cleaners.

5. Do not use this appliance near water (for example, near a bathtub,

washbowl, kitchen sink, or laundry tub; in a wet basement; or near a

swimming pool).

6. Do not place this appliance on an unstable cart, stand, tripod, bracket,

or table. The appliance may fall, causing serious injury to a child or adult,

and serious damage to the appliance. Use only with a cart, stand, tripod,

bracket, or table recommended by the manufacturer or sold with the

appliance. Follow the manufacturer’s instructions for mounting, and use a

recommended mounting accessory.

7. Slots and openings in the cabinet provide ventilation, ensure reliable

operation, and protect from overheating. Do not block or cover these

openings, and do not place the appliance on a bed, sofa, rug, or other

similar surface. Do not place the appliance in a built-in installation such as

a bookcase or rack unless it provides proper ventilation as speciﬁed by the

manufacturer.

8. Keep appliance away from heat sources such as radiators, heat registers,

stoves, or other appliances (including ampliﬁers) that produce heat.

9. Operate this appliance using only the power source indicated on its marking

label. If you are not sure of your home’s power type, consult your appliance

dealer or local power company.

10. This device is equipped with a three-wire grounding-type plug, a plug

having a third (grounding) pin. This plug will only ﬁt into a grounding-type

power outlet. This is a safety feature. If you are unable to insert the plug into

the outlet, contact your electrician to replace your obsolete outlet. Do not

defeat the safety purpose of the grounding-type plug.

11. Route power-supply cords so they are not likely to be walked on or pinched

by items placed on or against them, paying particular attention to cords

at plugs, convenience receptacles, and the point where they exit from the

appliance.

12. Clean only as recommended by the manufacturer.

13. An outside antenna system should not be located in the vicinity of overhead

power lines or other electric light or power circuits, or where it can fall into

such power lines or circuits. When installing an outside antenna system,

extreme care should be taken to keep from touching such power lines or

circuits as contact with them might be fatal.

14. Unplug the power cord from the outlet when you know that you will not be

using the appliance for a long period of time.

15. Do not overload wall outlets, extension cords, or integral convenience

receptacles, as this can result in a risk of ﬁre or electric shock.

16. Never push objects of any kind into this appliance through openings, as

they may touch dangerous voltage points or short out parts that could result

in a ﬁre or electric shock. Never spill liquid of any kind on the appliance.

17. Move appliance and cart combinations with care. Quick stops, excessive

force, and uneven surfaces may cause the appliance and cart combination

to overturn.

18. Unplug this appliance from the wall outlet and refer servicing to qualiﬁed

service personnel under the following conditions:

• When the power-supply cord or plug is damaged.

• If liquid has been spilled or objects have fallen into the appliance.

• If the appliance has been exposed to rain or water.

• If the appliance does not operate normally by following the operating

instructions. Adjust only those controls that are covered by the operating

instructions, as an improper adjustment of other controls may result in

damage and will often require extensive work by a qualiﬁed technician to

restore the appliance to normal operation.

• If the appliance has been dropped or damaged in any way.

• When the appliance exhibits a distinct change in performance.

19. Do not attempt to service this appliance yourself, as opening or removing

covers may expose you to dangerous voltage or other hazards. Refer all

servicing to qualiﬁed service personnel.

20. When replacement parts are required, be sure the service technician has

used replacement parts speciﬁed by the manufacturer or have the same

characteristics as the original part. Unauthorized substitutions may result in

ﬁre, electric shock, or other hazards.

21. Upon completion of any service or repairs to this appliance, ask the service

technician to perform safety checks to determine that the appliance is in

proper operating condition.

22. For added protection for this product during a lightning storm, unplug

it from the wall outlet. This will prevent damage to the product due to

lightning and power line surges.

23. Only use attachments recommended by the product manufacturer.

24. The product should be mounted to a wall or ceiling only as recommended

by the manufacturer.

25. Overloading — Do not overload wall outlets, extension cords, or integral

convenience receptacles, as this can result in a risk of ﬁre or electric shock.

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

This symbol is intended to inform you that important

operating and maintenance instructions are included in the

literature accompanying this product.

This symbol is intended to alert you to the presence of un-

insulated dangerous voltage within the product’s enclosure

that might be of sufﬁcient magnitude to constitute a risk of

electric shock. Do not open the product’s case.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT

REMOVE THE COVER OR BACK. NO USER-SERVICEABLE PARTS

INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

WARNING: To reduce the risk of ﬁre or shock hazard, do not expose

this product to rain or moisture.

About Your Ampliﬁer

Ampliﬁer Features

Illuminated Power

Switch

Lights up when you

turn on the switch.

Output Power

Level Indicators

Indicates the total

stereo output

power level.

MIC 1, MIC 2, MIC 3

Adjust volume for the

connected microphones.

PHONES Jack

Connect

headphones

here.

A/B Speaker Switch

Select the speakers you want

to use with the ampliﬁer in

Channel A, Channel B, or

both (for use with 8 ohm

speakers only).

About Your Ampliﬁer

CLIPPING Indicator

Lights up to remind

you to reduce volume

when the ampliﬁer

output is too high.

CD/AUX

Adjust volume of

CD or auxiliary

sound source.

Volume Control:

Left/Right speakers

Turn to regulate volume of

left and right speakers.

FEEDBACK FILTER

Turn to control audio

feedback.

MIC 4/PHONO

Adjust volume

of connected

microphone (MIC 4)

or turntable.

PROTECTION Indicator

Lights up when the

ampliﬁer overheats or

if a shorted load occurs

on the ampliﬁer output.

The ampliﬁer resets itself

when the problem is

corrected.

About Your Ampliﬁer

Cooling Fan

Automatically activated

whenever the ampliﬁer

is turned on. This air

cooling system rapidly

disperses interior heat

to reduce operating

temperature.

¼” Stereo Input

Jacks

Connect stereo

input sources (CD

or DVD player, TV,

etc.) here using a

¼-inch (balanced)

audio cable.

XLR Balanced

Microphone Inputs

Connect up to four

high impedance

microphones to your

ampliﬁer.

Phono Input Jacks

Connect your turntable here.

MIX BUS Jack

Connect an extra ampliﬁer if you

have multiple audio sources.

CD/AUX Jack

Connect any high-level sound

source for music or special effects.

EQ IN/OUT Jacks

Connect an equalizer or other

external processor.

¼” Unbalanced

Microphone Inputs

Connect up to four

microphones to your

ampliﬁer using a ¼”

unbalanced cable, for

left and right mono

sound.

MIC 4/PHONO

Switch

Select MIC 4 or

PHONO input.

About Your Ampliﬁer

Audio Input Jacks

Connect input sources

(CD or DVD player,

TV, etc.) here using an

unbalanced audio cable.

Match the colors on your

cable connections with

the colors on the jacks.

Speaker Terminals

Connect two sets of speakers

(Left and Right, for Aand B).

GND

(Ground Wire Connection)

Fuse

STEREO/MONO Selector

Select bridged mono input

mode in combination with a

mono signal source plugged

into the left channel.

EQ/BYPASS Selector

Select EQ if you are

using an equalizer

or BYPASS if you are

using another external

processor.

Ampliﬁer Setup

Getting Started

Select a Location

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

Preset the Controls

Before you begin connecting or using your ampliﬁer, preset the controls on the

audio input source and ampliﬁer to avoid overdriving a channel or producing

loud sounds.

Preset the Audio Input Source

Set the controls on the audio input sources to the following levels:

Audio Device Control Setting

Turntable Power Flat

Tape Deck Power Flat

CD Player Power Flat

Ampliﬁer Power Flat

Receiver Tone Off

Presetting the Ampliﬁer

To prevent excessive volume and possible hearing damage, set the controls on

the ampliﬁer to the following:

Control Setting

POWER Off

MIC 1,MIC 2,MIC 3,MIC 4/PHONO,

CD/AUX Volume Control

Min

LEFT and RIGHT Volume Control Min

After you turn on the ampliﬁer or change the program source, set the controls to

a comfortable listening level.

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