Optimus AMX-4 User manual

©1999 Tandy Corporation.
All Rights Reserved.
Optimus and RadioShack are registered trademarks used by Tandy Corporation.
Cat. No. 40-1407
AMX-4 Portable Amplified Speaker System
Your Optimus AMX-4 Portable Ampli-
fied Speaker System lets you take ex-
cellent stereo sound with you almost
anywhere. You can connect the
speakers to any personal audio
source, such as a cassette player, por-
table CD player, or radio with a 1/8-inch
jack. Its bass and treble boost controls
let you adjust high and low frequency
response for enhanced sound.
CONNECTING POWER
Using Batteries
You can power the system from four C
batteries. For best performance, we
recommend RadioShack alkaline bat-
teries.
Follow these steps to install batteries
in each speaker.
1. Lift the tab on the battery compart-
ment cover in the direction of the
arrow and remove the cover.
2. Install two C batteries as indicated
by the polarity symbols (+ and –) in-
side the compartment.
3. Replace the cover.
4. Repeat Steps 1–3 for the other
speaker.
Note: If the sound becomes weak or the
red indicator dims, replace the batteries.
Caution: To avoid damage to the sys-
tem, remove the batteries if you do not
plan to use the speakers for a month or
more, or if you plan to use AC or DC
power.
Using AC Power
You can power the speakers from a
standard AC outlet with an AC adapter
(not supplied), available at your local
RadioShack store.
Cautions:
• You must use an AC adapter that
supplies 9 volts DC and delivers at
least 500 milliamps. Its center tip
must be set to positive and its plug
must correctly fit the system's DC 9V
500 mA jack. Using an adapter that
does not meet these specifications
could seriously damage the system
or the adapter.
40-1407.fm Page 1 Monday, August 30, 1999 11:31 AM

2
• Be sure you connect the adapter as
instructed, and disconnect the
adapter from the AC outlet before
you disconnect it from the system.
Otherwise, the unconnected plug
might touch some metal and dam-
age the adapter.
Follow these steps to power the system
from an AC outlet.
1. Insert the adapter's barrel plug into
the system’s DC 9V jack.
2. Plug the adapter into a standard AC
outlet.
Using Vehicle Battery Power
You can power the speakers from your
vehicle's battery with a DC adapter (not
supplied), available at your local Ra-
dioShack store.
Cautions:
• Your vehicle must have a 12-volt
DC, negative-ground electrical sys-
tem.
• You must use a DC adapter that
supplies 9 volts and delivers at least
500 milliamps. Its center tip must be
set to positive, and its plug must cor-
rectly fit the system’s DC 9V jack.
Using an adapter that does not meet
these specifications could seriously
damage the system or the adapter.
• Be sure you connect the adapter as
instructed, and disconnect the
adapter from the cigarette lighter be-
fore you disconnect it from the sys-
tem. Otherwise, the unconnected
plug might touch some metal in the
vehicle and damage the adapter
and/or the vehicle’s electrical sys-
tem.
Follow these steps to power the system
from your vehicle’s battery:
1. If necessary, set the adapter's volt-
age switch to 9V.
2. Insert the adapter’s barrel plug into
the system’s DC 9V jack.
3. Plug the adapter’s large plug into
the vehicle’s cigarette lighter socket.
OPERATION
Notes:
• Be sure the audio sources power is
off and its volume control is set to its
minimum level.
• If the audio source is stereo, the
speaker with the built-in amplifier is
the right speaker.
1. Insert the speaker system's 1/8-inch
miniplug into your audio source's
headphone jack.
40-1407.fm Page 2 Monday, August 30, 1999 11:31 AM

3
2. Turn on the audio source and adjust
the volume to a comfortable listen-
ing level.
3. To turn the amplifier on, press POW-
ER. The red indicator lights.
Note: The system’s volume varies
with the audio sources volume level.
Use the audio source's volume con-
trol to set the volume.
4. Press BASS in for enhanced low fre-
quency response or out for normal
response.
5. Press TREBLE in for enhanced high
frequency response or out for nor-
mal response.
6. To set built-in amplifier off, press
POWER again.
Note: If the audio source’s output power
does not exceed 750 mW, you can use
the speakers with POWER set to OFF.
Volume will be lower than if you used
the amplifier.
CARE
To enjoy your speaker system for a long
time:
• Keep the speaker system dry. If it
gets wet, wipe it dry immediately.
• Use and store the speaker system
only in normal temperature environ-
ments.
• Handle the speaker system gently
and carefully. Don’t drop it.
• Keep the speaker system away from
dust and dirt.
• Wipe the speaker system with a
damp cloth occasionally to keep it
looking new.
Modifying or tampering with the speaker
system’s internal components can
cause a malfunction and invalidate its
warranty. If your speaker system is not
performing as it should, take it to your lo-
cal RadioShack store for assistance.
POWER
40-1407.fm Page 3 Monday, August 30, 1999 11:31 AM

RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
09A99 Printed in China
Limited Ninety-Day Warranty
This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal
use for ninety (90) days from the date of purchase from RadioShack company-owned stores and authorized Ra-
dioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WAR-
RANTIES 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 WAR-
RANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY OR
RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT 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 WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAM-
AGES 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 the limitations on how long an implied warranty lasts or the exclusion of incidental or con-
sequential 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, mis-
use, 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
We Service What We Sell
04/99
SPECIFICATIONS
Full-range Shielded Speaker .................................................. 21/4Inches in Diameter
Amplifier Input Impedance ............................................................................ 600 ohm
Frequency Response ...................................................................... 500 Hz to 12 kHz
Tone Boost .............................................................................. Bass, +5 dB at 125 Hz
Treble, +5 dB at 6.3 kHz
Power Output (@10% THD) ........................................................ 0.75 W per Channel
1 W per Channel (Maximum)
Power Requirements .................................................. DC 9V, 500 mA (with Adapter)
4 C Batteries
Dimensions ............................................ 43/8×23/4×33/8Inches (111 ×70 ×86 mm)
Weight (Without Batteries) ....................................................... 1 lb, 1.3 oz (490.46 g)
40-1407.fm Page 4 Monday, August 30, 1999 11:31 AM