Radio Shack 04A00, 32-2004 User Manual
250-Watt Stereo PA Amplifier
Owner’s Manual
Please read before using this equipment.
ˆ
Contents
Contents .................................................................................................................................. 2
Features .................................................................................................................................. 3
Preparation ............................................................................................................................. 4
Presetting the Controls ...................................................................................................... 4
Presetting Audio Input Devices .................................................................................. 4
Presetting the Amplifier .............................................................................................. 4
Mounting the Amplifier ...................................................................................................... 4
Placing the Speakers ........................................................................................................ 4
Connections ............................................................................................................................ 5
Connecting an Input Source .............................................................................................. 5
Unbridged Connection ............................................................................................... 5
Bridged Connection ................................................................................................... 5
Grounding the Input Source .............................................................................................. 6
Connecting Speakers ........................................................................................................ 6
Preparing the Speaker Wires ..................................................................................... 6
Unbridged Connection ............................................................................................... 6
Bridged Connection ................................................................................................... 7
Using the Switched AC Outlet ........................................................................................... 7
Connecting Power ............................................................................................................. 7
Using Your Amplifier .............................................................................................................. 8
Using the Meters/METER RANGE .................................................................................... 8
CLIP Indicator ................................ ...................................................................... ............. 8
Using SPEAKER A/B ........................................................................................................ 8
Monitoring the Sound Sources .......................................................................................... 8
Listening Safely ......................................................................................................... 9
Care ......................................................................................................................................... 9
Replacing the Fuse .............................................................................. ............................. 9
The FCC Wants You to Know .............................................................................................. 10
Specifications ....................................................................................................................... 11
©
1998, 2000 Tandy Corporation.
RadioShack is a registered trademark used by Tandy Corporation.
2
All Rights Reserved.
Contents
ˆ
Features
Your Public Address Amplifier 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 in meeting halls and auditoriums, at sports events, in schools, and in
the office for paging systems — anywhere
you need to deliver special announcements
with excellent sound.
The amplifier (if bridged) produces up to 350
watts of clean, powerful sound with minimum
distortion.
Your amplifier includes these features:
10–50000 Hz Frequency Response
Built-In Cooling Fan
amplifier by reducing its internal temperature.
Two Mounting Options
the amplifier in a standard-sized audio equipment rack or on a desk, shelf, or table.
2 Lighted VU Meters
fier’s output for each channel in decibels.
Left and Right Output Level Gain Controls
— let you adjust the overall sound level on
the left and right channels.
Clipping Indicator
source signal overdrives the amplifier.
Phones Jack
phones so you can listen privately.
Bridging Capability
amplifier’s two channels and use the amplifier with only one channel, producing a total of
350 watts.
Meter Range Select Switch
trol the meter’s sensitivity.
— lets you connect head-
— helps protect the
— you can mount
— measure the ampli-
— lights if a sound
— you can combine the
— lets you con-
Input Jacks
audio input sources for music and special effects.
A/B SPEAKER
speakers you want to use with the amplifier.
STEREO/MONO
output type; stereo or mono (bridged).
Binding Post Terminals
connect wires directly to the amplifier.
Switched AC Outlet
devices by plugging them into the back of the
amplifier.
WARNING
shock hazard, do not expose this product
to rain or moisture.
CAUTION
ELECTRIC SHOCK, DO NOT REMOVE
COVER OR BACK. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
!
—let you connect a variety of
Switches
Switch
: To reduce the risk of fire or
CAUTION
RISK OF ELECTRIC SHOCK.
: TO REDUCE THE RISK OF
This symbol is intended to alert you to
the presence of uninsulated 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.
This symbol is intended to inform you
that important operating and maintenance instructions are included in the
literature accompanying this product.
— let you select the
— lets you select the
— let you easily
— lets you power other
DO NOT OPEN.
!
Features
3
ˆ
Preparation
PRESETTING THE
CONTROLS
Before you begin making connections or using your amplifier, preset the audio input
source’s and the amplifier’s controls to avoid
overdriving a channel or producing sudden
unexpected loud sounds.
Warning:
set the audio input device’s and amplifier’s
controls as indicated in the following sections. After you turn on the amplifier or
change the program source, adjust the controls to a comfortable listening level.
Presetting Audio Input Devices
Always set the power control for an audio
mixer or preamplifier you connect to the amplifier to OFF.
Presetting the Amplifier
Set the amplifier’s controls as follows:
POWER
SPEAKER A/B
LEFT and RIGHT MIN
METER RANGE
To prevent possible hearing loss,
Control Setting
Out
Out
Out
MOUNTING THE AMPLIFIER
You can mount the amplifier in a standardsized audio equipment rack or on a desk,
shelf, or table. Before you use your amplifier,
be sure you place it in 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).
To mount the amplifier on a standard-sized
audio equipment rack, drive and tightly secure mounting screws (not supplied) through
the mounting holes.
PLACING THE SPEAKERS
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 toward the
audience (especially if the speakers are far
apart) so the coverage areas overlap to prevent dead spots (areas not covered by the
speakers’ sound). Position the speakers
slightly above the level of the listeners’
heads (see “Connecting Speakers” on
Page 6).
4
Preparation
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