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Features
Your RadioShack MPA-125 100-Watt PA
Amplifier gives you the versatility and power
you need in a professional sound system. Its
wide frequency response easily handles am-
plification of voice and music. Use it in meet-
ing halls and auditoriums, at sports events, in
schools, and in the office for paging systems
– anywhere you need to deliver special an-
nouncements with excellent sound.
Your amplifier includes these features:
100-Watt Output
— provides powerful audio
output for many types of sound installations.
60–25000 Hz Frequency Response
— pro-
vides wide-ranging response for true audio
reproduction.
Lighted VU Meter
— measures the amplifi-
er’s output in decibels.
Two Mounting Options
— you can mount
the amplifier in a standard-sized audio equip-
ment rack or on a desk, shelf, or table.
Clipping Indicator
— lights when a sound
source signal exceeds its mixing control set-
ting.
Overload Protection
— automatically inter-
rupts the amplifier’s power and lights an indi-
cator if the amplifier gets too hot due to
power overload.
Four Microphone Input Jacks
— you can
connect up to four balanced or unbalanced
microphones to the amplifier.
CD/Auxiliary Input Jack
— you can connect
a variety of audio input sources for music
and special effects.
Phones Jack
— you can connect head-
phones so you can hear the mixed audio in
privacy.
Master Volume Control
— lets you adjust
the overall sound level.
EQ IN/OUT Switch
— lets you connect and
use an equalizer with the amplifier.
Push-Terminal Connectors
— let you easi-
ly connect wires directly to the amplifier.
Five Individual Source Mixing Controls
—
let you mix connected sound sources individ-
ually or all at the same time.
Feedback Filter
— lets you control audio
feedback.
Read this manual carefully. It describes vari-
ous speaker connections to help you select
the best arrangement for your amplifier and
connected equipment, and explains how to
use the amplifier.
WARNING:
T
o reduce the risk of fire or shock haz-
ard, do not expose this product to rain or moisture.
CAUTION
RISK OF ELECTRIC SHOCK.
DO NOT OPEN.
CAUTION:
TO REDUCE THE RISK OF
ELECTRIC SHOCK, DO NOT REMOVE
COVER OR BACK. NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL.
This symbol is intended to alert you to
the presence of uninsulated danger-
ous voltage within the product’s enclo-
sure that might be of sufficient
magnitude to constitute a risk of elec-
tric shock. Do not open the product’s
case.
This symbol is intended to inform you
that important operating and mainte-
nance instructions are included in the
literature accompanying this product.
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