Radio Shack 32-2054 User Manual
40-Watt
32-2054
PA Amplifier
Thank you for purchasing your 40-Watt PA Amplifier from
RadioShack. 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 the office for paging systems—anywhere you need to
deliver special announcements with excellent sound.
What’s Included
PA Amplifier AC Power Cord
Fuse (Installed) DC Power Cord
User’s Guide
Please read this user’s guide before installing, setting up, and
using your new amplifier.
www.radioshack.com
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Contents
Quick Start
Contents
Quick Start .......................................................................................... 3
A Look at Your Amplifier..................................................................... 6
Front View........................................................................................................ 6
Rear View .........................................................................................................7
Preparation.......................................................................................... 8
Placing the Amplifier ......................................................................................8
Placing Speakers............................................................................................. 8
Presetting the Controls...................................................................................8
Presetting the Audio Input Sources.........................................................8
Presetting the Amplifier............................................................................ 8
Tips for Speaker Connection .........................................................................9
Total Speaker Impedance......................................................................... 9
Proper Phasing ..........................................................................................9
About Speaker Terminals .........................................................................9
Determining the Speaker Wire Length ...................................................9
Connections ...................................................................................... 10
Connecting Speaker Wires to the Amplifier............................................... 10
Connecting One Speaker............................................................................. 10
Connecting Two Speakers in Series ............................................................11
Connecting Two Speakers in Parallel ..........................................................11
Connecting Four Speakers in Series and Parallel Combination ............... 12
Connecting Speakers with Transformers .................................................... 13
Troubleshooting ................................................................................ 15
Specifications .................................................................................... 16
Care and Maintenance...................................................................... 16
Replacing the DC Power Cord’s Fuse .........................................................16
Safety ................................................................................................ 17
Do Stuff............................................................................................. 19
Limited Warranty............................................................................... 20
Quick Start
Follow these steps to quickly set up your PA Amplifier. For detailed operation
instructions, see Pages 6-14.
Step 1 Connect optional components (microphones,
tuners, turntables, CD players, tape decks, or extra
AMPLIÞERTOEXPANDYOURSYSTEM
AUX/CD
PHONO AUX/CD
PHONO
Connect low-level sound sources, such as a turntable.
Note: Set the PHONO AUX/CD switch to PHONO.
Caution: Before connection, turn off your amplifier and components and set
their volume controls to minimum. To prevent hum and other noise, use lowcapacitance shielded cables.
3TEP #ONNECTSPEAKERSTOYOURAMPLIÞER
Connect your speakers together in series, in parallel, or in series and parallel
combination. Then connect the speaker’s negative terminals to amplifier’s
COM terminal, and their positive terminals to the amplifier’s 4, 8, 16, or
70V terminal.
Connect high-level sound
sources, such as CD player,
tape deck, or tuner.
MIX BUS
Use a shielded cable with
phono plugs to connect to
another MP-40 amplifier.
MIC 1, MIC 2
Connect up to two
microphones.
2
5
Quick Start
Retaining Catch
Press down the retaining catch of the
correct terminal and insert the wire end
into the terminal’s hole. Then, release
the retaining catch to secure the wire.
To speaker’s positive terminal
To speaker’s negative terminal
3TEP 0OWERYOURAMPLIÞER
To use AC power, use the AC power cord to connect your amplifier’s AC IN
jack to a standard wall outlet.
To use DC power, use the DC power cord to connect your amplifier’s DC 12V IN
jack to a vehicle’s 12V accessory socket.
Quick Start
4) Adjust the following controls to the desired volume and balance:
MIC 1, MIC 2, PHONO/AUX, 100Hz, 1kHz, and 8 kHz.
5) When you get the desired balance, adjust MASTER VOLUME to the
desired level.
Power Indicator
LEVEL Indicator (in dB)
MIC 1 and MIC 2
Volume Controls
MASTER VOLUME
TONE CONTROL
(100Hz, 1kHz, 8kHz)
DC 12V IN AC IN
Cautions:
• Your vehicle must have a negative ground electrical system. If you are not
sure of this, check with your vehicle dealer.
• Disconnect the AC power cord before you connect the DC power cord.
Likewise, disconnect the DC power cord before you connect the AC
power cord.
3TEP 5SEYOURAMPLIÞER
1) Turn on the POWER switch. The power indicator lights.
2) Start the input sound source.
3) Set MASTER VOLUME to about the middle position. The LEVEL Indicator
ßASHESONFROMLEFTTORIGHTINDICATINGTHESOUNDLEVEL
4
POWER
PHONO/AUX Volume Control
Step 5 Monitor the sound source
Insert the ¼” (6.35 mm) plug of either mono or stereo headphones (not
supplied) to the PHONES jack. Headphones help easily check and adjust the
balance of the sound sources.
PHONES Jack
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A Look at Your Amplifier A Look at Your Amplifier
A Look at Your Amplifier
Front View
POWER
Turn the amplifier
on or off.
Power Indicator
Lights when the amplifier
is turned on.
PHONO/AUX Volume Control
Adjust the volume of the turntable
or auxiliary sound source.
LEVEL Indicator (in dB)
Monitors and controls
the output power level.
L/R PHONO Jacks
Connect a turntable.
Terminals (COM, 4, 8,
16, 70V)
Connect speaker wires to
the selected terminals.
Rear View
GND
Connect a ground wire
(black or green) to avoid
low-frequency hum.
AC OUTLET (UNSWITCHED)
Supply power (maximum load of
100W) to a musical instrument or
another amplifier.
PHONES Jack
Connect
headphones
to hear mixed
audio in privacy.
MIC 1 and MIC 2
Input Jacks
Connect up to two
dynamic microphones.
MIC 1 and MIC 2
Volume Controls
Adjust the levels of
the microphones
separately.
TONE CONTROL (100Hz, 1kHz, 8kHz)
Enhance the sound or tailor the high,
medium, and low frequencies for each
audio source input to the acoustics of a
particular performance environment.
6
MASTER VOLUME
Adjust the overall
sound level.
PHONO AUX/CD Switch
Select turntable or other
audio input source.
AUX/CD Input Jacks
Connect a variety of audio
input sources for music and
special effects.
MIX BUS Jack
Connect an extra
amplifier for
multiple audio
sources.
DC 12V IN Jack
Power the
amplifier from a
5A, 12V vehicle
battery source.
AC IN
Connect to a
standard AC outlet
using the supplied
AC power cord.
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