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07A08
32-2055 A
Printed in China
32-2055
250-Watt · Stereo
PA Amplifier
Quick Start Guide
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.
Step 1: Selecting a Location
Preset the Audio Input Source
Audio Device Control Setting
Turntable Power Flat
Tape Deck Power Flat
CD Player Power Flat
Amplifier Power Flat
Receiver Tone Off
Presetting the Amplifier
Before you make any connections, be sure the amplifier is
turned off and AC power cord is not plugged in.
Mic, CD/AUX, and LEFT / RIGHT volume controls should
be set to minimum.
Step 2: Preset the Controls
1. Connect your input source.
You can connect optional components, such as
microphones, tuner, turntable, audio mixer, preamplifier,
or CD player to your amplifier to expand your system.
To prevent hum and other noise, use low-capacitance
shielded cable (not supplied, available at your local
RadioShack store or at www.radioshack.com).
Note: This amplifier is equipped with both stereo phono
input and ¼-inch (6.35 mm) jacks. The ¼-inch input jacks
on the top are stereo while the others are left and right
mono.
2. Connect your speakers.
Connect your speaker wire to the speaker terminals
matching their polarities, the positive (+) speaker wire to
the positive terminal (red) and the negative (–) speaker
wire to the negative speaker terminal (black).
To bridge the amplifier’s channels:
• Speakers connected to the same channel (A or B) are
part of a pair and must be of the same impedance.
• Speakers connected to different channels (A or B) are
not part of a pair and can be different impedance.
3. Connect Power
Plug the power cord into a standard AC outlet.
Step 3: Connecting Your Amplifier
1. Start the input sound source.
2. Make sure LEFT and RIGHT volume control on the the
amplifier are set to MIN.
3. Press POWER to turn on the amplifier.
4. Rotate LEFT and RIGHT volume controls to their
middle positions.
5. One at a time, adjust MIC1, MIC2, MIC3, MIC4/
PHONO, and CD/AUX to the desired volume and
balance.
If you hear feedback after you adjust these controls,
turn FEEDBACK FILTER clockwise until the noise
disappears.
6. Adjust LEFT and RIGHT volume controls to the
desired volume level after you find your desired
balance.
Step 4: Using Your Amplifier
Illuminated
Power Switch
Lights up when
you turn on the
switch.
Left/Right speakers
Volume Control
Turn to regulate volume of
left and right speakers.
FEEDBACK
FILTER
Turn to control
audio feedback.
MIC 1, MIC 2, and MIC 3, MIC 4/PHONO
and CD/AUX
Adjust volume for the connected
microphones, turntable, CD or auxiliary
sound source.
Connect stereo
input sources (CD
or DVD player,
TV, etc.) with ¼”
(balanced) audio
cable to Stereo
Input Jacks.
Connect up to
4 microphones
with 3 pin
XLR plug to
Balanced
Microphone
Inputs.
Connect an auxiliary sound
source (CD, tape deck or
tuner) to Audio Input Jacks.
Use a shield cable with
phono plugs at each end.
Connect an extra
amplifier to MIX
BUS Jack
Use a shield cable
with phono plugs at
each end.
Connect up to
4 microphones
with ¼”
(6.35mm) plug
to Unbalanced
Microphone
Inputs.
MIC 4/
PHONO
Switch
Select MIC 4
or PHONO
input.
Connect low-level audio input source (e.g.
Turntable) to Phono Input Jacks
If you connect a low-level audio input source to
the PHONO jacks, set MIC4/PHONO to PHONO.
To avoid a low-level hum, connect your turntable’s
ground wire (usually black or green) to the GND
terminal on the amplifier.
Connect an equalizer or other
external processor to EQ
IN/OUT Jacks.
You can also connect a tape
deck to the EQ OUT jack for
recording.