32-2003.fm Page 1 Tuesday, March 28, 2000 10:45 AM
MPA-125 100-Watt PA Amplifier
Owner’s Manual
Please read before using this equipment.
32-2003.fm Page 2 Tuesday, March 28, 2000 10:45 AM
ˆ
Contents
Features .................................................................................................................................. 3
Preparation ............................................................................................................................. 4
Presetting the Controls ...................................................................................................... 4
Presetting Audio Input Devices .................................................................................. 4
Presetting the Amplifier .............................................................................................. 4
Mounting the Amplifier ...................................................................................................... 5
Placing the Speakers ........................................................................................................ 5
Connections ............................................................................................................................ 5
Connecting Input Sources ................................................................................................. 5
Connecting Microphones ........................................................................................... 5
Connecting a Turntable .............................................................................................. 6
Connecting an Auxiliary Sound Source ..................................................................... 7
Connecting the MIX BUS Jack ................................................................................... 7
Connecting an Equalizer ............................................................................................ 7
Connecting the Speakers .................................................................................................. 8
Determining Total Speaker Impedance ...................................................................... 8
Preparing the Speaker Wire ....................................................................................... 9
Connecting Only One Speaker .................................................................................. 9
Connecting Two Speakers In Series .......................................................................... 9
Connecting Two Speakers In Parallel ...................................................................... 10
Connecting Four Speakers In Series/Parallel Combination ..................................... 10
Connecting Speakers with Transformers ................................................................. 11
Connecting Power ........................................................................................................... 12
Using Your Amplifier ........................................................................................................ 12
Safety Indicators ............................................................................................................. 13
Monitoring the Sound Sources ........................................................................................ 13
Listening Safely ....................................................................................................... 13
Using an Equalizer .......................................................................................................... 13
Using the Feedback Filter ............................................................................................... 14
Troubleshooting ................................................................................................................... 15
Care and Maintenance ......................................................................................................... 16
Replacing the Fuse ................................................................ .. ....................................... 17
The FCC Wants You to Know ......................................................................................... 17
Specifications ....................................................................................................................... 18
©
2000 Tandy Corporation.
RadioShack and RadioShack.com are trademarks used by Tandy Corporation.
2
All Rights Reserved.
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ˆ
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 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.
Your amplifier includes these features:
100-Watt Output
— provides powerful audio
output for many types of sound installations.
60–25000 Hz Frequency Response
— provides 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 equipment rack or on a desk, shelf, or table.
Clipping Indicator
— lights when a sound
source signal exceeds its mixing control setting.
Overload Protection
— automatically interrupts the amplifier’s power and lights an indicator if the amplifier gets too hot due to
power overload.
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 individually 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:
ard, do not expose this product to rain or moisture.
o reduce the risk of fire or shock haz-
T
CAUTION
RISK OF ELECTRIC SHOCK.
DO NOT OPEN.
CAUTION:
ELECTRIC SHOCK, DO NOT REMOVE
COVER OR BACK. NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL.
TO REDUCE THE RISK OF
!
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 headphones so you can hear the mixed audio in
privacy.
Features
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 mainte-
!
nance instructions are included in the
literature accompanying this product.
3
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ˆ
Preparation
PRESETTING THE CONTROLS
Before you begin making connections or using your amplifier, preset the aud io input source’s
and the amplifier’s controls to avoid over-driving a channel or produci ng sudden unexpected
loud sounds.
Presetting Audio Input Devices
Set the audio input sources’ controls to these levels:
Audio Device Control Setting
Turntable Power Off
Tape Deck Power Off
CD Player Power Off
Amplifier/Receiver Power Tone Off Flat
Presetting the Amplifier
Warning:
below. After you turn on the amplifier or change the program source, adjust the control s to a
comfortable listening level.
Set the amplifier’s controls to these levels:
4
To prevent possible hearing loss, set the amplifier’s controls to the settings shown
Control Setting
POWER
POWER
MIC 1, MIC 2, MIC 3, MIC 4/PHONO, CD AUX MIN
MASTER VOLUME MIN
MIC 1
MIC 2
MIC 3
Preparation
MIC 4/PHONO
CD/AUX
Out
MASTER VOLUME
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MOUNTING THE AMPLIFIER
You can mount the amplifier in a standardsized audio equipment rack or on a desk,
shelf, or table. 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).
ˆ
Connections
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 in toward the
listeners, especially if you place speakers far
apart so their 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 the Speakers” on
Page 8).
CONNECTING INPUT SOURCES
You can connect optional components such as microphones, a tuner, a turntable, or a CD player to your amplifier to expand your audio system. To prevent hum and other noise, use low-capacitance shielded cable. Your local RadioShack store carries a wide selection of audio
components and cable.
Before you make any connections, be sure
AC power cord is not plugged in.
POWER
on the front of the amplifier is out and th e
Connecting Microphones
You can connect up to four high- or low-impedance microph ones to the microphone inputs on
the back of the amplifier. Each input (labeled
and unbalanced jack. You need a microphone cord with a 1/4-inch (6.35-mm) plug to connect to
an unbalanced jack or a microphone cord with a 3-pin XLR plug to connect to a balanced jack.
MIC 1, MIC 2, MIC 3
1
/
-Inch Plug
4
3-Pin XLR Plug
Connections
MIC 4
MIC 3 MIC 2
MIC 4 MIC 3 MIC 2
, and
MIC 4
) has a balanced
MIC 1
MIC 1
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Notes:
• If your microphone’s cord is longer than 20 feet (6.01 meters), we recommend that you
connect it to a balanced jack to reduce signal hum.
• If you connect a microphone to both jacks for
you connect to the unbalanced jack has priority.
• If you connect a microphone to either
amplifier to
MIC 4
.
Connecting a Turntable
GND
PHONE/MIC 4
MIC 1, MIC 2, MIC 3
MIC 4
jack, set
Turntable
, or
PHONO/MIC 4
MIC 4
, the microphone
on the back of the
You can connect a low-level audio input source (such as a magnetic cartridge turntable) to the
L PHONO
If you connect a low-level audio input source to the
of the amplifier to
and
R PHONO
PHONO
jacks on the back of the amplifier.
PHONO
.
jacks, set
PHONO/MIC 4
on the back
To avoid a low-frequency hum, connect your turntable’s ground wire (usually black or green) to
GND
the amplifier’s
6
terminal.
Connections
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Connecting an Auxiliary Sound Source
You can connect any high-level sound source, such as a CD player, tape deck, or tuner, to the
CD/AUX
jack on the back of the amplifier.
CD/AUX
Connecting the MIX BUS Jack
You can connect another MPA-125 to this jack to double the size of your PA system. This lets
you use up to eight microphones (or six microphones and two tu rntables), and two auxiliary
sound sources.
Use a shielded cable with phono plugs at each end, and connect the cable between the
BUS
jacks on the back of the two amplifiers. For the best results, do not use a cable longer than
6 feet.
MIX BUS Jack
Connecting an Equalizer
You can connect an equalizer or other external signal processor to the
on the back of the amplifier.
EQ IN/OUT
EQ IN
and
EQ OUT
jacks
MIX
Note:
You can also connect a tape deck to the
EQ OUT
Connections
jack for recording.
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CONNECTING THE
SPEAKERS
You can connect one or more 4-, 8- or 16ohm speakers to the amplifier, with or without transformers. To ensure equal volume
from each speaker, all connected speakers
should have the same impedance rating.
Proper phasing is important when you use
more than one speaker in the same room or
area. Out-of-phase speakers can lose up to
one-half of their potential volume, and can
have a significantly decreased bass effect.
Most speaker terminals are color-coded or
have a mark that indicates the terminal’s polarity. Usually, terminals with positive polarity
are red or have a plus symbol (+), and terminals with negative polarity are black or have
a minus symbol (–). Phasing is correct when
you connect + to + and – to –.
Determining Total Speaker
Impedance
Before you connect speakers to the amplifier, you must determine the total speaker impedance.
Caution:
than 16 ohms or lower than 4 ohms can
damage your amplifier or speakers.
In determining the total speaker impedance,
you must first determine if you are connecting the speakers in series, parallel, or a series/parallel combination.
Note:
speakers (in series or parallel), only use
speakers that have the same impedance.
A total speaker impedance higher
For the best results when connecting
• Speakers are connected in series when
the first speaker’s positive terminal is
connected to the next speaker’s negative terminal.
Determine the total impedance of
speakers you want to connect in series
by adding up the individual impedances
of all the connected speakers. For
example, if you want to connect two 8ohm speakers in series, add 8 (the
impedance of one speaker) plus 8 (the
impedance of the other speaker) for a
total speaker impedance of 16 ohms
(see “Connecting Two Speakers In
Series” on Page 9).
• Speakers are connected in parallel
when all the speakers’ negative terminals are connected together and all their
positive terminals are connected
together.
Determine the total impedance of
speakers you want to connect in parallel
by dividing the impedance of one
speaker by the number of speakers. For
example, if you plan to connect two 8ohm speakers in parallel, divide 8 (the
impedance of one speaker) by 2 (the
number of speakers) for a total speaker
impedance of 4 ohms (see “Connecting
Two Speakers In Parallel” on Page 10).
• If you are connecting more than two
speakers using only series or only parallel connections, the total impedance
might exceed the amplifier’s maximum
impedance (16 ohms) or fall below its
minimum impedance (4 ohms).
For example, if you connect four 8-ohm
speakers:
• In series, the total impedance is 32
ohms (8 + 8 + 8 + 8 = 32). This
exceeds the maximum rating.
• In parallel, the total impedance is 2
ohms (8 divided by 4 = 2). This falls
below the minimum rating.
8
Connections
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You can achieve a proper total impedance
by combining series and parallel connections.
Preparing the Speaker Wire
Use the shortest length of wire possible to
connect the speakers. After placing the
speakers, use this table to determine the
wire length and choose the appropriate
gauge size:
Wire Length Wire Gauge
25 feet or less 18 gauge
Over 25 feet 16 gauge
Note:
If you connect speakers without transformers, the speaker wire should be no longer than 50 feet (see “Connecting Speakers
with Transformers” on Page 11).
To prepare the speaker wire, remove about 1
inch of insulation from the end of the speaker
wire you are connecting to the amplifier.
Then twist the exposed wire to secure all of
the wire strands.
Connecting Only One Speaker
Connect the speaker’s negative (–) terminal
COM
(common) on the back of the amplifi-
to
er. Then connect the speaker’s positive (+)
4
8
ΩΩΩΩ
terminal to the speaker terminal (
16
ΩΩΩΩ
) on the back of the amplifier that match-
ΩΩΩΩ
,
, or
es the speaker’s impedance.
8
Speaker
ΩΩΩΩ
Connecting Two Speakers In
Series
Follow these steps to connect speakers in
series.
To connect speaker wire to the amplifier,
press the push terminal lever on the amplifier
for the connector you want, insert the end of
the wire into the terminal’s hole, then release
the lever to secure the wire.
Terminal Levers
Connections
Left Speaker
Right Speaker
1. Connect the left speaker’s positive (+)
terminal to the right speaker’s negative
(–) terminal.
2. Connect the left speaker ’s negative (–)
COM
terminal to
on the back of the
amplifier.
3. Connect the right speaker’s positive (+)
terminals to the speaker terminal (
8
16
ΩΩΩΩ
, or
ΩΩΩΩ
) on the back of the amplifier
4
that matches the total speaker impedance.
ΩΩΩΩ
,
9
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Connecting Two Speakers In Parallel
Follow these steps to connect speakers in parallel.
Two 8
Speakers
ΩΩΩΩ
8
ΩΩΩΩ
___________
2 Speakers
8
ΩΩΩΩ
8
ΩΩΩΩ
Speaker 1
Speaker 2
1. Connect both speaker’s negative (–) terminals to each other, then connect both wires to
COM
the
terminal on the back of the amplifier.
2. Connect both speaker’s positive (+) terminals to each other , then connect both wires to the
speaker terminal (
ΩΩΩΩ
ΩΩΩΩ
,
, or
ΩΩΩΩ
) on the back of the amplifier that matches the total
4
8
16
speaker impedance.
= 4
ΩΩΩΩ
Connecting Four Speakers In Series/Parallel Combination
Follow these steps to combine series and parallel connections.
8
ΩΩΩΩ
of 1 Pair
ΩΩΩΩ
No. of Pairs
16W
2
= 8
= Total
ΩΩΩΩ
8
ΩΩΩΩ
ΩΩΩΩ
1. Group the four speakers into two pairs.
2. Connect each pair of speakers in series. If you connected 8-ohm speakers, the total
impedance of each pair is 16 ohms (8 + 8 = 16).
10
Connections
8
ΩΩΩΩ
8
ΩΩΩΩ
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3. Connect the two pairs of speakers in
parallel. If you connected 8 ohm speakers the total impedance of both pairs is 8
ohms (16 ÷ 2 = 8).
Note:
If each of the four speakers is 8
ohms, the total speaker impedance of
the combined series/parallel connection
described above is also 8 ohms. Likewise, the total speaker impedance is 4
or 16 ohms if the speakers are 4 or 16
ohms, respectively.
4. Connect the speakers’ negative (–) ter-
COM
minals to the
terminal on the back
of the amplifier.
5. Connect the speaker’s positive (+) ter-
4
8
ΩΩΩΩ
ΩΩΩΩ
minals to the speaker terminal (
16
ΩΩΩΩ
) on the back of the amplifier that
or
,
matches the total speaker impedance as
calculated in Step 3.
Connecting Speakers with Transformers
For the best results when you connect two or
more speakers to your system, use a line
transformer (not supplied) for each speaker.
Transformers offer these advantages:
• You can connect speakers with different
impedances without causing differences in output between the speakers.
• You can add or remove a speaker from
the system without having to recalculate
the entire system’s impedance.
• You can reduce signal loss when you
use speaker wire over 50 feet long.
Line transformers have several connectors
called taps.
Taps
The primary taps (on one side of the transformer) are the inputs and are rated in watts.
The secondary taps (on the opposite side of
the transformer) are the outputs and are rated in ohms.
,
Primary
Taps
Cautions:
• Before you connect the speakers, be
sure the total wattage of the primary tap
you intend to use does not exceed the
amplifier’s maximum 100-watt output
power rating.
• Avoid multiple connections to the
and
COM
terminals on the back of
RMS
the amplifier.
Secondary
Taps
70V
Connections
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Follow these steps to connect speakers using a transformer.
Connect a wire from
70V RMS
on the back of
the amplifier to the transformer’s desired primary tap (10, 5, 2.5, 1.25 or 0.62 watts).
Note:
Usually, each speaker in a system
uses the same wattage tap. If you want a
particular speaker to have a higher volume
level, connect the wire from
70V RMS
to a
higher wattage tap on the transformer.
COM
Connect a wire from
on the back of the
amplifier to the C (common) taps on the
transformer’s primary side.
Connect a wire from the speaker’s positive
(+) terminal to the transformer’s secondary
tap that matches the speaker’s total impedance (4 ohms, 8 ohms, or 16 ohms).
Connect a wire from the speaker’s negative
C
(–) terminal to the
(common) tap on the
transformer’s secondary side.
CONNECTING POWER
To connect the amplifier to power, plug its
power cord into a standard AC outlet.
USING YOUR AMPLIFIER
Press in
Start the input sound source.
Rotate
One at a time, adjust
4/PHONO
and balance.
Note:
these controls, turn
wise until the noise disappears (see “Using
the Feedback Filter” on Page 14).
After you get the desired balance, adjust
MASTER VOLUME
el.
POWER
to turn on the amplifier.
MASTER VOLUME
CD/AUX
, and
to its mid-position.
MIC 1, MIC 2, MIC 3, MIC
to the desired volume
If you hear feedback after you adjust
FEEDBACK FILTER
clock-
to the desired volume lev-
Your amplifier’s fuse (located on the amplifier’s back panel) protects the amplifier from
voltage surges. If the PROTECTION indicator does not light when you press
POWER
(see “Using Your Amplifier” and “Safety Indicators” on Page 13), check the fuse. If it is
blown, see “Replacing the Fuse” on Page 17.
12
Connections
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SAFETY INDICATORS
Your amplifier has two indicators that warn you of potential damage to the amplifier.
PROTECTION IndicatorCLIPPING Indicator
The CLIPPING indicator lights when a sound source’s signal exceeds its mixing control setting.
If this happens, reduce the level of the appropriate mixing control or redu ce
until the indicator flickers only at peak volume levels.
The PROTECTION indicator lights if the amplifier gets too hot because of a power overload.
The amplifier’s built-in protection circuit temporarily interrupts the amplifier’s power. If this hap-
POWER
pens, press
rect whatever caused the overload. Then press
Note:
If the power does not immediately come on, turn off the power again, wait about 5 more
minutes, then press
to turn off the amplifier, let the amplifier cool for about 15 minutes, and cor-
POWER
POWER
again.
again to turn on the amplifier.
MASTER VOLUME
MONITORING THE SOUND
SOURCES
To monitor the sound sources, plug a pair of
mono or stereo headphones (not supplied)
with a
PHONES
Using headphones lets you easily check and
adjust the sound source’s balance. Your local RadioShack store carries a wide selection of headphones.
Listening Safely
To protect your hearing, follow these guidelines when you use headphones.
1
/4-inch (6.35-mm) plug into the
jack on the front of the amplifier.
• Set the volume to the lowest setting
before you begin listening. After you
begin listening, adjust the volume to a
comfortable level.
Connections
• Do not listen at extremely high volume
levels. Extended high-volume listening
can lead to permanent hearing loss.
• Once you set the volume, do not
increase it. Over time, your ears adapt
to the volume level, so a volume level
that does not cause discomfort might
still damage your hearing.
USING AN EQUALIZER
If you connected an equalizer, set
PAS S
on the back of the amplifier to EQ.
Note:
If the equalizer has a bypass switch,
be sure it is set to OUT or turned off. Otherwise, the equalizer has no effect on your system’s sound.
EQ/BY-
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USING THE FEEDBACK FILTER
FEEDBACK FILTER
The
feedback.
control lets you reduce or eliminate squeal and other noise ca used by
After you adjust
MASTER VOLUME, MIC 1, MIC 2, MIC 3, MIC 4/PHONO
amplifier and any connected sound source. If you hear any feedback, turn
CD/AUX
, and
FEEDBACK FILTER
, turn on the
clockwise until you reduce or eliminate the feedback.
Note:
FEEDBACK FILTER
The
control decreases feedback frequencies by up to 12 dB. If it does
not eliminate the feedback, try using a frequency equalizer to further decrease the feed back
frequencies.
FEEDBACK FILTER
14
Connections
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ˆ
Troubleshooting
We do not expect you to have any problems with your RadioShack MPA-125 100-Watt PA Amplifier, but if you do have a problem, this chart might help. If not, take the amplifier to your local
RadioShack store for assistance.
Symptom Possible Cause Suggestion
No power. The fuse might be blown. Check the amplifier’s fuse and replace it
Sound source or speakers not connected correctly.
MASTER VOLUME, MIC 1
No sound. Amplifier’s
Feedback.
MIC 2, MIC 3, MIC 4/PHONO
AUX
Sound source or speakers not connected correctly.
A microphone or cable might be faulty. Check all microphones and cables.
The speaker’s wiring might be shorted. Check all connections.
The speakers might be the wrong
impedance.
The speaker’s wires might be too
small.
The amplifier might have shut down. Turn the amplifier off and let it cool.
FEEDBACK FILTER
adjustment.
Microphones or speakers are too close
together.
, or
controls set to minimum.
might need
if necessary (see “Replacing the Fuse”
on Page 17).
Check all connections.
CD/
,
MASTER VOLUME, MIC 1, MIC
Adjust
2
MIC 3, MIC 4/PHONO
,
Check all connections.
Make sure all connected speakers have
the same impedance rating (see “Connecting the Speakers” on Page 8).
Make sure the speaker’s wires are 18gauge (for wire lengths up to 25 feet) or
16-gauge (for lengths over 25 feet). For
the best results, use the shortest length
of speaker wire possible.
Make sure the amplifier is properly ventilated, then turn it back on.
Turn the amplifier off and let it cool.
Make sure the amplifier is properly ventilated, then turn it back on.
Reposition the microphones and speakers.
,
and
CD/AUX
.
Troubleshooting
15
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ˆ
Care and Maintenance
Your RadioShack
craftsmanship. The following suggestions will help you care for your amplifier so you can enjoy it for years.
Modifying or tampering with the amplifier’s internal components can cause a malfunction and
might invalidate its warranty. If your amplifier is not performing as it should, take it to your local RadioShack store for assistance.
MPA-125 100-Watt PA Amplifier
Keep the amplifier dry. If it gets wet, wipe it dry immediately. Liquids might contain minerals that can corrode the electronic circuits.
Use and store the amplifier only in normal temperature environments. Temperature extremes can shorten the life of electronic devices and distort or melt
plastic parts.
Keep the amplifier away from dust and dirt, which can cause premature wear of
parts.
Handle the amplifier gently and carefully. Dropping it can damage circuit boards
and cases and can cause the amplifier to work improperly.
Wipe the amplifier with a damp cloth occasionally to keep it looking new. Do not
use harsh chemicals, cleaning solvents, or strong detergents to clean the amplifier.
is an example of superior design and
16
Care and Maintenance
32-2003.fm Page 17 Tuesday, March 28, 2000 10:45 AM
REPLACING THE FUSE
If the amplifier does not operate, you might
need to replace the fuse on the back of the
amplifier with the supplied (or another) 3amp, 250-volt fuse.
Important:
see if it starts again before you assume a
fuse needs to be replaced.
Caution:
than those specified. Doing so might damage
your amplifier.
1. Unplug the amplifier.
2. Use a Phillips screwdriver to remove the
3. If the fuse is blown, replace it.
4. Insert the fuse into the fuse holder’s
Let the amplifier cool down and
Do not use a fuse with ratings other
fuse holder cap on the back of the amplifier, then pull out the cap to remove the
fuse.
socket, press the fuse holder back into
the amplifier, then use a Phillips screwdriver to replace the fuse holder cap.
THE FCC WANTS YOU TO
KNOW
Your amplifier might cause TV or radio interference even when it is operating properly.
To determine whether your amplifier is causing the interference, turn off your amplifier. If
the interference goes away, your amplifier is
causing it. Try to eliminate the interference
by:
• moving your amplifier away from the
receiver
• contacting your local RadioShack store
for help
Care and Maintenance
17
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ˆ
Specifications
Output Power at THD 2%, 8 Ohm Load 1 kHz ................................................................................... 100 W
Total Harmonic Distortion (at 70 Watts, 8 ohms, 1 kHz, with Band Pass Filter)
MIC (Phone Jack) ....................................................................................................................... 0.25%
MIC (XLR Jack) .......................................................................................................................... 0.35%
CD/AUX ...................................................................................................................................... 0.20%
PHONO ...................................................................................................................................... 0.25%
Input Sensitivity (at 2% THD, 1 kHz)
MIC (Phone Jack) .................................................................................................................... 1.35 mV
MIC (XLR Jack) ............................................................................................................................ 1 mV
CD/AUX .................................................................................................................................... 150 mV
PHONO ..................................................................................................................................... 2.8 mV
Signal to Noise Ratio (Input Shorted) with WTD
MIC (Phone Jack) ........................................................................................................................ 60 dB
MIC (XLR Jack) ........................................................................................................................... 54 dB
CD/AUX ....................................................................................................................................... 73 dB
PHONO ....................................................................................................................................... 60 dB
Frequency Response (at 1 Watt, +/– 3 dB)
MIC (Phone Jack) ........................................................................................................... 60 Hz–20 kHz
MIC (XLR Jack) .............................................................................................................. 60 Hz–20 kHz
CD/AUX .......................................................................................................................... 60 Hz–20 kHz
PHONO (RIAA 100 Hz/10 kHz) ................................................................................. +12 dB/–12.5 dB
Notch Filter Effect
Range ............................................................................................................................. 300 Hz–3 kHz
Depth ......................................................................................................................................... –12 dB
Noise Level (Input Short) ................................................................................................................. 0.75 mV
Power Requirements ........................................................................................................... 120V AC 60 Hz
Dimensions (HWD) ....................................................................................... 4
Weight .............................................................................................................................................. 22.3 lbs
3
/16 × 1815/16 × 1115/16 Inches
(10.0 × 48.2 × 27.3 cm)
(10.1 kg)
Specifications are typical; individual units might vary. Specifications are subject to change and improvement without notice.
18
Specifications
32-2003.fm Page 19 Tuesday, March 28, 2000 10:45 AM
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Notes
Notes
19
32-2003.fm Page 20 Tuesday, March 28, 2000 10:45 AM
Limited One-Year Warranty
This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for one (1) year from the date of purchase from Radi oSha ck company- owned
stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING
THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED
IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED
HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT T O ANY
LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS
OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limit ation of incidental or consequential damages, so the above limitations or exclusions may not apply to
you.
In the event of a product defect during the warranty period, take the product and the RadioShack
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, unless otherwise provided by law: (a) correct the defect by product repair without charge for parts and
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase
price. All replaced parts and products, and products on which a refund is made, become the property of RadioShack. New or reconditioned parts and products may be used in the performance of
warranty service. Repaired or replaced parts and products are warranted for the remainder of the
original warranty period. You will be charged for repair or replacement of the product made after the
expiration of the warranty period.
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse,
accident, misuse, improper or abnormal usage, failure to follow instructions, improper installation or
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs
of product removal, installation, set-up service adjustment or reinstallat i on.
This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
RadioShack Customer Relations, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102
We Service What We Sell
12/99
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
32-2003
03A00
Printed in China
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