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Cat. No. 40-1372
OWNER’S MANUAL
Please read before using this equipment.
AMX-25
900 MHz Wireless Amplified Speakers
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PREPARATION
If you are using your audio
source’s stereo headphones jack,
connect the white and red plugs
at the other end of the patch cord
to the white and red phono jacks
on the supplied Y-cable.
INSTALLING THE
TRANSMITTER
Connecting to Your Audio
Source
You can connect the transmitter to
your audio source’s left and right au-
dio output jacks or its headphones
jack.
Do not connect the trans-
Caution:
mitter to the audio source’s speaker
output. Doing so could damage the
transmitter and audio source.
If your audio source has a 1/8-inch
headphones jack, connect the 1/8-
inch stereo plug on the other end
of the Y-cable directly to the
audio source’s 1/8-inch head-
phones jack.
1. Connect one end of the supplied
audio patch cord to the transmit-
ter’s AUDIO IN jacks (white plug to
L and red plug to R).
If your audio source has a
Note:
1/4-inch headphones jack, use the
supplied 1/8-to-1/4-inch stereo
adapter.
2. If you are using your audio
source’s audio output jacks, con-
nect the white and red plugs at
the other end of the patch cord
directly to the audio source’s cor-
responding left and right audio
jacks (white plug to left and red
plug to right).
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Connecting to Power
INSTALLING THE
SPEAKERS
Plug the supplied AC adapter’s small
straight barrel plug into the transmit-
ter’s DC 18V jack. Then plug the
adapter into a standard AC outlet.
Select a location for each speaker
that is near an AC outlet.
Each speaker’s supplied
Caution:
AC adapter (in a box marked FOR
SPEAKER) provides 15 volts and at
least 800 milliamps, and its plug’s
center tip is positive. Using an adapt-
er that does not meet these specifica-
tions could damage the adapter or
the speaker.
Cautions:
Follow these steps to install the
speakers.
• The transmitter’s supplied AC
adapter (in a box marked FOR
TRANSMITTER) provides 18 volts
and at least 150 milliamps, and
its plug’s center tip is positive.
Using an adapter that does not
meet these specifications could
damage the adapter or the trans-
mitter.
1. Turn off both speakers by rotating
their POWER/VOL knobs fully
counterclockwise until they click.
• The CHARGER jack on the trans-
mitter is for charging the
RadioShack PRO-100 Wireless
Headphones (Cat. No. 33-1145).
Do not plug any other device into
this jack.
2. Set each speaker’s mode switch
as follows:
L — For the left stereo speaker
R — For the right stereo speaker
MONO — If your source is mono
3. Plug the AC adapter’s large right-
angle barrel plug into the
speaker’s DC 15V 800mA jack.
4. Plug the AC adapter into a stan-
dard AC outlet.
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OPERATION
Follow these steps to use your speak-
ers.
5. Slowly rotate TUNING on each
speaker until the indicator on the
front of each speaker lights
steadily.
1. Turn on your audio source.
2. Rotate the transmitter’s LEVEL all
the way to the right (minimum
setting).
Notes:
• When the indicator lights
steadily, the speaker is tuned
to the same frequency being
transmitted by the transmitter.
3. If you connected the transmitter
to an audio source’s LINE OUT-
PUT jack (or a jack that is not
controlled by the audio source’s
volume control), slowly rotate
LEVEL to the left until the indica-
tor at the front of the transmitter
just starts to flicker.
• If reception is poor, even when
the speakers are near the
transmitter, try either raising
the transmitter to a position
higher than the speakers or
moving it away from the audio
source.
If you connected the transmitter
to an audio source’s headphones
jack (or jack that is controlled by
the audio source’s volume con-
trol), set the audio source’s vol-
ume to the desired level first
(about midway), then slowly
rotate LEVEL to the left until the
indicator at the front of the trans-
mitter just starts to flicker.
• When transmitting over long
distances, the signal might get
weaker and the indicator might
dim. When this happens, your
speakers continue to operate
but receive the signals in mon-
aural instead of stereo.
6. Rotate each speaker’s POWER/
VOL knob to a comfortable listen-
ing level.
Some audio sources might
Note:
not make the indicator flicker. For
these sources, simply rotate
LEVEL all the way to the left.
Make sure you set both
Note:
speakers’ POWER/VOL knobs to
the same level so the stereo
sounds are properly balanced
between the two speakers.
4. Rotate each speaker’s POWER/
VOL knob clockwise until it clicks
and you hear the program source
or hissing.
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7. Set BASS on the back of each
speaker to ON for a deeper, richer
bass sound.
IF YOU HAVE
A PROBLEM
If you cannot get sound once you
have connected the system, check
these things:
• Make sure you rotate each
speaker’s
POWER/VOL
knob
clockwise until it clicks so the
speakers are turned on
• Be sure the AC adapters are
plugged in and have power
Be sure to turn off the speakers when
you are not using them.
• Be sure the audio source is
turned on and tuned to an active
frequency
If you hear distorted sound, check
these things:
• If you have connected to jacks
that are controlled by the audio
source’s volume control, be sure
the source’s volume control is
turned up
• Adjust TUNING on the speakers
• Change the position of the trans-
mitter
• Rotate FREQ. ADJUST on the
transmitter and then adjust TUN-
ING until the interference goes
away
• Adjust the speaker’s volume con-
trol
• Adjust TUNING on the speakers
• Adjust LEVEL on the transmitter
so the indicator at the front of the
transmitter occasionally flickers
• Change the position of the trans-
mitter
If you still have a problem with the
speaker system, see your local Ra-
dioShack store for assistance.
ADJUSTING THE
FREQUENCY
If you receive interference from other
devices, you might be able to reduce
it by adjusting the speaker’s operating
frequency. Simply rotate FREQ. AD-
JUST on the transmitter, then rotate
TUNING on each speaker until the au-
dio is free from interference.
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CARE AND MAINTENANCE
Your Optimus 900 MHz Wireless Amplified Speakers are an example of superi-
or design and craftsmanship. The following suggestions will help you care for
your speakers so you can enjoy them for years.
Keep the speakers dry. If they get wet, wipe them dry immediately.
Liquids might contain minerals that can corrode the electronic cir-
cuits.
Use and store the speakers only in normal temperature environ-
ments. Temperature extremes can shorten the life of electronic de-
vices and distort or melt plastic parts.
Handle the speakers gently and carefully. Dropping them can dam-
age the circuit boards and can cause the speakers to work improp-
erly.
Keep the speakers away from dust and dirt, which can cause pre-
mature wear of parts.
Wipe the speakers with a damp cloth occasionally to keep them
CLEANER
looking new. Do not use harsh chemicals, cleaning solvents, or
strong detergents to clean the speakers.
Modifying or tampering with your speaker system’s internal components can
cause a malfunction and might invalidate its warranty and void your FCC autho-
rization to operate it. If your speaker system is not operating as it should, take it
to your local RadioShack store for assistance.
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SPECIFICATIONS
TRANSMITTER
Operating Frequency Range ...................................................912.5–914.5 MHz
Power Source .................................................................18V DC, 150 milliamps
SPEAKERS
Frequency Response.....................................................................50 Hz–15 kHz
S/N Ratio ................................................................................................... 55 dB
Stereo Separation ................................................................................. ≥ 20 dB
≤
Audio Distortion .......................................................................................... 2%
Operating Range ..............................................................150 Feet (Open Field)
Automatic Frequency Control (AFC) ................................. More than ±150 kHz
Tuning Range ....................................................................... ≥913.5 ±1.25 MHz
Minimum Volume Hum ............................................................................ < 2mV
Bass Boost Effect (100 Hz) .................................................................... 8 ±2 dB
Power ...........................................................................................10 Watts RMS
Power Source .................................................................15V DC, 800 milliamps
Speaker Elements .............................................. 2-Inch Tweeter, 4-Inch Woofer
Specifications are typical; individual units might vary. Specifications are subject
to change and improvement without notice.
SUPPLIED ACCESSORIES
Audio Patch Cord
Y-Cable
1/8-to-1/4-inch Stereo Adapter
AC adapters
RadioShack Limited Warranty
This product is warranted against defects for 90 days from date of purchase from RadioShack company-
owned stores and authorized RadioShack franchisees and dealers. Within this period, we will repair it without
charge for parts and labor. Simply bring your RadioShack sales slip as proof of purchase date to any
RadioShack store. Warranty does not cover transportation costs. Nor does it cover a product subjected to mis-
use or accidental damage.
EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED
WARRANTIES ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRAN-
TIES CONTAINED HEREIN. Some states do not permit limitation or exclusion of implied warranties; there-
fore, the aforesaid limitation(s) or exclusion(s) may not apply to the purchaser.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
10/95
We Service What We Sell
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
1A7
Printed in China
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