Optimus AMX-25 User manual

Cat. No. 40-1372
OWNER’S MANUAL
Please read before using this equipment.
AMX-25
900 MHz Wireless Amplified Speakers
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© 1997 Tandy Corporation.
All Rights Reserved.
Optimus is a registered trademark used by Tandy Corporation.
RadioShack is a trademark used by Tandy Corporation.
FEATURES
Your Optimus 900 MHz Wireless Am-
plified Speakers bring you the latest
in wireless speaker technology. Oper-
ating in the 900 MHz band, this
speaker system’s signals easily travel
through walls and floors, delivering
high-quality stereo sound to almost
anywhere in or around your home.
Now you do not need to place the
speakers in the same room as your
stereo system to hear your favorite
programs.
The system includes a transmitter
that connects to your audio source,
and two speakers that receive signals
from the transmitter.
The speaker system’s features in-
clude:
Two-Wa
y
, Bass Reflex Speaker De-
si
g
n— provides excellent sound re-
production from even the most
demanding audio sources.
Bass Boost — adds a deeper, richer
bass sound.
10-Watt Amplifier — produces clear
sound throughout the high and low
frequency ranges.
Optional Speaker Bracket — (avail-
able through RadioShack Unlimited)
lets you easily mount your speakers
on the wall.
Char
g
er Jack — lets you charge the
PRO-100 Wireless Headphones.
THE FCC WANTS YOU
TO KNOW
Your speaker system might cause TV
or radio interference even when it is
operating properly. To determine
whether your speaker system is caus-
ing the interference, unplug your
speaker system’s transmitter. If the
interference goes away, your speaker
system is causing it.
Try to eliminate the interference by:
• Moving your speakers away from
the receiver
• Connecting your speakers to out-
lets that are on a different electri-
cal circuit from the receiver
• Contacting your local Ra-
dioShack store for help
Note: Your speakers are subject to
interference from other 900 MHz de-
vices such as wireless headphones,
cordless phones, or other wireless
speakers that operate on the same
frequencies. If you experience inter-
ference, try moving the speakers
away from the other devices.
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3
PREPARATION
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.
Caution: Do not connect the trans-
mitter to the audio source’s speaker
output. Doing so could damage the
transmitter and audio source.
1. Connect one end of the supplied
audio patch cord to the transmit-
ter’s AUDIO IN jacks (white plug to
Land red plug to R).
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).
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.
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.
Note: If your audio source has a
1/4-inch headphones jack, use the
supplied 1/8-to-1/4-inch stereo
adapter.
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4
Connecting to Power
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.
Cautions:
• 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.
•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.
INSTALLING THE
SPEAKERS
Select a location for each speaker
that is near an AC outlet.
Caution: Each speaker’s supplied
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.
Follow these steps to install the
speakers.
1. Turn off both speakers by rotating
their POWER/VOL knobs fully
counterclockwise until they click.
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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5
OPERATION
Follow these steps to use your speak-
ers.
1. Turn on your audio source.
2. Rotate the transmitter’s LEVEL all
the way to the right (minimum
setting).
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 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.
Note: Some audio sources might
not make the indicator flicker. For
these sources, simply rotate
LEVEL all the way to the left.
4. Rotate each speaker’s POWER/
VOL knob clockwise until it clicks
and you hear the program source
or hissing.
5. Slowly rotate TUNING on each
speaker until the indicator on the
front of each speaker lights
steadily.
Notes:
• When the indicator lights
steadily, the speaker is tuned
to the same frequency being
transmitted by the transmitter.
• 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.
• 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.
Note: Make sure you set both
speakers’ POWER/VOL knobs to
the same level so the stereo
sounds are properly balanced
between the two speakers.
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6
7. Set BASS on the back of each
speaker to ON for a deeper, richer
bass sound.
Be sure to turn off the speakers when
you are not using them.
If you hear distorted sound, check
these things:
• 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 LEVEL on the transmitter
so the indicator at the front of the
transmitter occasionally flickers
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.
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 the audio source is
turned on and tuned to an active
frequency
• 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 the speaker’s volume con-
trol
• Adjust TUNING on the speakers
• 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.
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7
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
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.
CLEANER
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RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
1A7 Printed in China
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 warrant
y
g
ives
y
ou specific le
g
al ri
g
hts and
y
ou ma
y
also have other ri
g
hts which var
y
from state tostate.
We Service What We Sell 10/95
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