32-2046.fm Page 1 Monday, January 24, 2000 12:33 PM
Cat. No. 32-2046
OWNER’S MANUAL
Please read before using this equipment.
50 Watt Speaker/Amplifier
MPS-50
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32-2046.fm Page 3 Monday, January 24, 2000 12:33 PM
Cautions:
To reduce the risk of fire or
shock hazard, do not expose this product to rain
or moisture.
WARNING:
• To prevent electrical shock, any AC-
powered equipment that you con-
nect to the MPS-50 should be con-
nected to a 3-prong (grounded) AC
outlet.
CAUTION
RISK OF ELECTRIC SHOCK.
!
DO NOT OPEN.
• To avoid damaging the MPS-50's
speaker, connect the sound source
to the MPS-50 first, then connect
the MPS-50 to power.
TO REDUCE THE RISK OF
CAUTION:
ELECTRIC SHOCK, DO NOT REMOVE
COVER OR BACK. NO USER-SERVICE-
ABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
• Be sure to rotate MASTER to MIN
(minimum) before you connect the
MPS-50 to power, or before you
connect or disconnect an input
source to the MPS-50.
This symbol is intended to alert
you to the presence of uninsu-
lated dangerous voltage within
the product’s enclosure that might
be of sufficient magnitude to con-
stitute a risk of electric shock. Do
not open the product’s case.
MASTER
MI
MA
INPUT
GAIN
BASS
TREBLE
REVERB
INPUT
GAIN
BASS
TREBLE
REVERB
REVERB
LEVEL
DISTORTION
MASTER
This symbol is intended to inform
you that important operating and
MI
MA
MI
MA
MI
MA
MI
MA
MI
MA
MI
MA
MI
MA
OFF
MA
MI
MA
ON OFF
ON OFF
HIGH
LOW
HIGH
LOW
CHANNEL
1
CHANNEL
2
POWER
maintenance instructions are
included in the literature accom-
panying this product.
!
3
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32-2046.fm Page 4 Monday, January 24, 2000 12:33 PM
CONNECTIONS
To receive signal from the connected
INPUT
1
4
device, connect a phone cable with a / -
inch (6.35 mm) plug to the MPS-50’s
RETURN jack, then connect the other
end to the device’s output jack.
Note: You can connect audio equipment
with a stereo or monaural plug. When
you connect a stereo plug, the MPS-50
converts the stereo output to monaural.
Use a phone cable (available at your lo-
REVERB REMOTE
1
4
cal RadioShack store) with a / -inch
(6.35 mm) plug to connect an electric
guitar, keyboard, or high impedance mi-
crophone to the HIGH input jack of
Channel 1 and/or Channel 2.
You can connect an optional remote
footswitch to the MPS-50’s REVERB RE-
MOTE jack and use the switch to control
reverb effects.
PHONES
LINE
OUT
RETURN
SEND
REVERB
REMOTE
1
4
Use a phone cable with a / -inch (6.35
mm) plug to connect a low impedance
(200–600 ohms) microphone to the LOW
jack of Channel 1 and/or Channel 2.
CAUTION DISCONNECT SUPPLY CORD BEFORE CHANGING
CAUTION FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE
ONLY
T
.
NO. 32-2046
MPS-50
~120V AC 60Hz
150W
GUITAR AMPLIFIER
POWER SUPPLY: ~120V 60Hz 1(FUSE 2A
250V)
Custom Manufactured in China
andy
Corporation, Fort Worth, TX 76102
COMMERCIAL AUDIO
EQUIPMENT
POWER
for RadioShack
,
A
Division of
T
115703
PHONES
LINE
OUT
RETURN
SEND
REVERB
REMOTE
FUSE 2A
250V
CAUTION
RISK OF ELECTRIC
DO NOT OPEN
CAUTION TO PREVENT ELECTRIC SHOCK DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD
RECEPTACLE
OUTPUT
POWER
To play the MPS-50's output signal
through your sound system, connect
one end of an audio patch cord (avail-
Note: Before you connect the MPS-50
to AC power, set POWER to the off (out)
position and MASTER to MIN.
able at your local RadioShack store)
1
4
with a / -inch (6.35 mm) phone plug to
the MPS-50's LINE OUT jack. Then con-
nect the other end to your amplifier/re-
ceiver/mixer's input jack.
Connect the female jack end of the sup-
plied power cord to the AC jack on the
back of the MPS-50, then connect the
other end to a standard AC outlet.
SEND AND RETURN
To send the MPS-50's signal to a sound
effect device, such as an echo reverb or
digital sampler processor, connect a
CAUTION DISCONNECT SUPPLY CORD BEFORE CHANGING
CAUTION FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE
ONLY
CAT
.
NO. 32-2046
MPS-50
~120V AC 60Hz
150W
GUITAR AMPLIFIER
POWER SUPPLY: ~120V 60Hz 150W (FUSE 2A
250V)
Custom Manufactured in China
andy
Corporation, Fort Worth, TX 76102
COMMERCIAL AUDIO
EQUIPMENT
POWER
for RadioShack
,
A
Division of
T
115703
SEND
PHONES
LINE
OUT
RETURN
REVERB
REMOTE
FUSE
25
CAUTION
RISK OF ELECTRIC
DO NOT OPEN
CAUTION TO PREVENT ELECTRIC SHOCK DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD
RECEPTACLE
phone cable (available at your local Ra-
1
4
dioShack store) with a / -inch (6.35 mm)
plug to the MPS-50’s SEND (output)
jack, then connect the other end to the
sound effect device’s input jack.
4
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32-2046.fm Page 5 Monday, January 24, 2000 12:33 PM
OPERATION
USING HEADPHONES
INPUT
GAIN
BASS
INPUT
GAIN
BASS
To listen privately, connect low-imped-
MI
MA
MI
MA
MI
MA
MI
MA
HIGH
LOW
HIGH
LOW
CHANNEL
1
CHANNEL 2
ance headphones (available at your lo-
1
4
cal RadioShack store) with a / -inch
(6.35 mm) phone plug to the PHONES
INPUT
GAIN
BASS
TREBLE
REVERB
INPUT
GAIN
BASS
TREBLE
REVERB
REVERB
LEVEL
DISTORTION
MAS
jack on the back of the MPS-50.
MI
MA
MI
MA
MI
MA
MI
MA
MI
MA
MI
MA
MI
MA
OFF
MA
MI
ON OFF
ON OFF
HIGH
LOW
HIGH
LOW
CHANNEL
1
CHANNEL
2
PHONES
1. Rotate MASTER to MIN.
2. Press POWER up to turn on the
MPS-50. The POWER indicator
lights.
CAUTION DISCONNECT SUPPL
CAUTION FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE
ONL
Y
CORD BEFORE CHANGING
Y
CAT
.
NO. 32-2046
MPS-50
~120V AC 60Hz
150W
GUITAR AMPLIFIER
POWER SUPPLY: ~120V 60Hz 150W (FUSE 2A
250V)
Custom Manufactured in China
andy
Corporation, Fort Worth, TX 76102
COMMERCIAL AUDIO
EQUIPMENT
POWER
R
for RadioShack
,
A
Division of
T
115703
SEND
PHONES
LINE
OUT
RETURN
REVERB
REMOTE
FUSE 2A
250V
CAUTION
RISK OF ELECTRIC
DO NOT OPEN
CAUTION TO PREVENT ELECTRIC SHOCK DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD
RECEPTACLE
3. Adjust the sound for each channel
where you have connected an input
source.
Listening Safely
• Rotate GAIN clockwise toward
MAX to increase the volume, or
counterclockwise toward MIN to
reduce it.
To protect your hearing, follow these
guidelines when you use headphones.
• Set the volume to the lowest setting
before you begin listening. After you
begin listening, adjust the volume to
a comfortable level.
• Rotate BASS clockwise toward
MAX to increase the low fre-
quency sounds, or counterclock-
wise toward MIN to reduce them.
• Do not listen at extremely high vol-
ume levels. Extended high-volume
listening can lead to permanent
hearing loss.
• Rotate TREBLE clockwise toward
MAX to increase the high fre-
quency sounds, or counterclock-
wise toward MIN to reduce them.
• Once you set the volume, do not
increase it. Over time, your ears
adapt to the volume level, so a vol-
ume level that does not cause dis-
comfort might still damage your
hearing.
• Rotate DISTORTION until you hear
the amount of distortion you want.
• Press REVERB in on each chan-
nel where you want to apply
reverb effects. Then rotate
REVERB LEVEL toward MAX to
increase the amount of reverb, or
toward MIN to lower it.
4. To turn the MPS-50 off, press
POWER down.
5
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32-2046.fm Page 6 Monday, January 24, 2000 12:33 PM
CARE
To enjoy your MPS-50 for a long time:
Important Notes:
• Keep the MPS-50 dry. If it gets wet,
wipe it dry immediately.
• Let the MPS-50 cool down and see
if it starts again before you assume
a fuse needs to be replaced.
• Use and store the MPS-50 only in
normal temperature environments.
• Because the internal supply fuse is
located on the printed circuit board,
we strongly recommend that you
take it to your local RadioShack
store rather than attempting to
replace it yourself.
• Handle the MPS-50 gently and care-
fully. Don’t drop it.
• Keep the MPS-50 away from dust
and dirt.
• Wipe the MPS-50 with a damp cloth
occasionally to keep it looking new.
Caution: Do not use a fuse with ratings
other than those specified here. Doing
so might damage your MPS-50.
Modifying or tampering with the MPS-
50’s internal components can cause a
malfunction and invalidate its warranty.
If your MPS-50 is not performing as it
should, take it to your local RadioShack
store for assistance.
REPLACING THE FUSES
If the MPS-50 does not operate, the
power fuse under the AC socket on the
rear panel or the internal suppy fuses on
the printed circuit board might have
blown. If this happens, replace the fuses
with new ones of the same type, avail-
able at your local RadioShack store.
Power fuse
2 Amp 250V, slow blow
Internal supply fuse
3.5 Amp 250V, slow
blow
6
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32-2046.fm Page 7 Monday, January 24, 2000 12:33 PM
SPECIFICATIONS
Input Impedance .................................................................... 15K Ohms (High Level)
3K ohms (Low Level)
Output Power, 1% T.H.D., 4 Ohms Load, 1 kHz ........................................... 50 Watts
10% T.H.D. 4 Ohm Load, 1 kHz .................................................................... 65 Watts
Line Out (High 50 mV Input), 2 kHz ................................................................ 500 mV
Send Out (High 50 mV Input), 2 kHz .............................................................. 500 mV
T.H.D. at 2 kHz 2w ............................................................. 0.2% High and Low Level
Input Sensitivity, 2 kHz at 50 Watts Output .................................. 50 mV (High Level)
5 mV (Low Level)
S/N Ratio (A-Weighted) ................................................................ 70 dB (High Level)
60 dB (Low Level)
Frequency Response 0 dB = 2W (2 kHz) .................... 100 Hz –10 dB, 10 kHz +5 dB
High and Low Level
Tone Control, Bass, 100 Hz ............................................. +8 dB (Max.) –11 dB (Min.)
Tone Control, Treble, 10k Hz ........................................... +8 dB (Max.) –11 dB (Min.)
Return In 2 kHz 50 Watts Output .................................................................... 500 mV
Delay Time ...................................................................................................... 150 mS
Noise Level ......................................................................................................... 2 mV
Power Requirement .......................................................................... AC 120 V/60 Hz
Speaker ............................................................................................ 12-Inch, 4 Ohms
1
1
2
3
Dimensions (HWD) ................................................................ 18 / × 16 / × 11 Inches
(470 × 415 × 280 mm)
Weight ................................................................................................................ 34 lbs
(15.04 kg)
Specifications are typical; individual units might vary. Specifications are subject to
change and improvement without notice.
7
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32-2046.fm Page 8 Monday, January 24, 2000 12:33 PM
Limited Ninety-Day Warranty
This product is warranted by RadioShack against manufacturing defects in material and workman-
ship under normal use for ninety (90) days from the date of purchase from RadioShack 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 LIABIL-
ITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RE-
SPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE
OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WAR-
RANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVE-
NIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN AD-
VISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in-
cidental 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, un-
less 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 prop-
erty 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 reinstallation.
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
04/99
We Service What We Sell
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
08A99
Printed in China
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