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Electronic Subwoofer
Cat. No. 12-2012
OWNER’S MANUAL
Please read before using this equipment.
Crossover
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FEATURES
Your Optimus Electronic Subwoofer
Crossover is designed to give you excellent control over the sound produced by your autosound system.
The crossover directs a selectable
range of lower audio frequencies to
your subwoofer speakers for increased bass response, and blocks
mid-range frequencies to enhance
sound clarity.
The crossover’s features include:
Two T
pes of Inputs
— lets you use
the crossover with an autosound s ystem that has either line-out jacks or
standard speaker outputs.
Low Pass F ilter S elec tor
— lets you
adjust the frequency filter to 50 Hz, 90
Hz, or 180 Hz to match your subwoofer speaker system.
Inpu t Level Co ntrols
— let you adjust line or speaker input levels to
match your autosound system.
Bass Boost Controls
— let you
boost the selected subwoofer bass
output by 12 dB.
©
1996 Tandy Corporation.
Optimus is a registered trademark used by Tandy Corporation.
RadioShack is a trademark used by Tandy Corporat ion.
All Rights Reserv ed .
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INSTALLATION
You can easily connect this crossover. However, improper connections can damage your crossov er and
other components in your autosound
system, and possibly your vehicle’s
electrical system. Before you begin,
you should know:
• Which wire is the power wire in
your vehicle’s electrical system
• If your autosound system has
line-level or speaker-level outputs
Before you install your crossover,
carefully read all the installation instructions in this ow n er ’s manual.
Notes:
• Use audio patch cables with
phono-type connectors (available at your local RadioShack
store) to complete the low level
input/output connections.
• Use your autosound system’s
speaker wires to complete the
high level input connections.
• Use 18-gauge wire (available at
your local RadioShack store) to
complete the power connections.
• Turn your autosound system’s
volume all the way down before
installation.
• Set the subwoofer amplifier gain
(input level) and crossover input
level controls to their midpoints.
CHOOSING A
MOUNTING LOCATION
Choose the moun ting location for the
crossover first, but do not mount it until you have connected the wiring, adjusted the controls, and confirmed
that the crossover operates properly
with your system. By choosing the location first, you can later mount the
crossover without re-routing the
wires.
Choose a mounting location that:
• Is as near as possible to your
autosound system connections (It
is important to keep the audio
cables as short as possible to
reduce noise and interference)
• Does not interfere with the operation of the vehicle
• Is not directly in front of a heating
vent
• Allows drilling of mounting holes
without damaging other vehicle
components
• Allows convenient and safe routing of wires
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CONNECTING INPUT/
OUTPUT
reduces the possibility o f dama ge
to your crossover or autosound
system during installation.
Note:
After you complete the
connections and reconnect the
battery cable, you will need to reset all clock/memory devices in
your vehicle.
2. Connect your autosound system’s L (left) and R (right) outputs
to the crossover’s
INPUT
(right)
jacks.
L
(left) and
This crossover has both speakerlevel and line-level inputs. If your
autosound system has line-level
outputs, use the two
LOW LEVEL
input jacks. If your autosound
system does not have line-level
outputs, tap into the wires for the
existing speakers and use the
HIGH LEVEL
four
input jacks.
Connect the autosound system
speaker wires to the crossover,
carefully matching polarity (L+ to
L+
, L– to L–, R+ t o R+, and R– to
R–
).
R
Note:
Be sure to correctly match the
input and output connections (left output to left input, and right output to
right input).
1. Disconnect the negative (–) cable
from your vehicle’s battery. This
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Use either the
HIGH LEVEL
LOW LEVEL
input terminals, but
not both.
3. Connect the crossover’s
and
R
(right)
OUTPUT
jacks to the
L (left) and R (right) inputs of the
amplifier that drives the subwoofer speakers.
L
(left)
or
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CONNECTING POWER
1. Ensure the negative (–) cable is
disconnected from your vehicle’s
battery.
2. Connect the crossover’s
(ground) terminal to a metal part
of the vehicle’s frame.
Caution:
Do not connect the
ground wire to a non-metallic
(plastic) part, or to any part insulated from the vehicle’s frame by
a non-metallic part.
GND
4. Connect your autosound system’s switched power lead wire
(usually orange) to the crossover’s
REMOTE
terminal. This
turns the crossover on and off
when you turn your autosound
system on and off.
Note:
If your autosound system
does not hav e a switched power
lead wire, connect the cross-
REMOTE
over’s
terminal to a point
in your vehicle’s fuse box that
provides 12-volt battery power
only when the ignition is set to
ON or ACC.
5. Reconnect the cable to your vehicle battery’s negative (–) terminal.
3. Connect the crossover’s
(power) terminal directly to the
vehicle battery’s +12 volt terminal.
B+12V
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TESTING THE
CONNECTIONS
Follow these steps to check your autosound system before adjusting and
mounting the crossover.
1. Turn on your autosound system
and adjust the volume t o a comfortable level. The POWER indicator lights.
2. Play a cassette tape or CD that
has a wide dynamic range, or
tune to a strong FM station.
3. If the sound from any speaker is
distorted or has static (or if t here
is no sound from a speaker), turn
off the power immediately, then
check the wiring connections.
If the system sounds with no distortion or static, proceed to “Adjusting the Controls.”
ADJUSTING THE
CONTROLS
Setting the Low Pass
Crossover Point
LOW PASS
The
one of three cross over points. All signals at or below the selected frequency “cross over” to your subwoofer
speakers.
selector lets you set
Set the selector t o
the range of low-frequency sounds.
Set the selector to
decrease the range o f low-frequency
sounds.
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180 Hz
90 Hz
to increase
50 Hz
or
to
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Adjusting the Input Level
The input level c ontrols let you adjust
the crossover to balance the subwoofer’s sound level with the rest of
your autosound system.
Turn your autosound system up to a
normal listening level, then use a flathead screwdriver to adjust each
PUT LEVEL
er is as loud as desired.
Caution:
input terminals and turn your autosound system volum e too hi gh f or th e
crossover, you could damage the
crossover. To reduce this possibility,
set the
their midpoints.
control until the subwoof-
If you use the
INPUT LEVEL
HIGH LEVEL
controls past
IN-
Adjusting the Subwoofer
Bass Boost
SUBWOOFER BASS BOOST
The
trols let you boost 45 , 80, or 120 Hz
subwoofer output by 12 dB to enhance low sounds when desire d. Set
45Hz/80Hz/120Hz
the
appropriate position, then set
to ON. To return to the normal bass
setting, set
+12dB
selector to the
OFF
to
.
con-
+12dB
MOUNTING THE
CROSSOVER
After you have correctly connected
the crossover and set the controls,
follow these steps to mount the crossover.
1. Using the crossover mounting
holes as a guide, mark the positions for the mounting screw
holes at the desired location.
2. At each marked position, drill a
9
/64-inch (3.57 mm) hole.
Caution:
into anything behind the mounting
surface.
3. Attach the crossover at the
mounting location using the supplied sheet metal screws, lockwashers, and washers.
Be careful not to drill
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SPECIFICATIONS
Power Supply ................................................... 14.4 Volts DC Negative Ground
Current Drain .......................... ................ ................. ................ ................ 30 mA
Total Harmonic Distortion (THD) ................................................ 0.04% at 20 Hz
Hum and Noise ............................................................................. 150µV typical
Line-Level (Low) Input Impedance ..................................................... 10 kOhms
Speaker-Level (High) Input Impedance . ............................................ 100 Ohms
Operating Voltage ......................................................................... 10.5–16V DC
S/N Ratio ..............................................................................90 dB (A-Weighted)
Crossover Frequency .................... Subwoofer, Low Pass: 50 HZ/90 Hz/180 Hz
Crossover Slope ........................................................................... 12 dB/Octave
Channel Separation ...................................................................... 60 dB Typical
Output Level .............................................. ....... More Than 2V RMS at 1% THD
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Dimensions (HWD) .......................... 1
Weight ........................................................................................ 10. 2 oz (290 g)
/16 × 51/8 Inches (26 × 92 × 131 mm)
3
×
Specifications are typical; individual units m ight vary. Specifications are subject
to change and improvement without notice.
RadioShack Limited Warranty
This product is warr anted against defects for 1 year 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
RadioShack stor e. Warranty does not cover transportation costs. Nor does it cover a product subjected to
misuse, accidental damage, alteration or improper installation.
EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED
WARRANTIES ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states do not permit lim itation or exclusion of imp lied warranties ; therefore, the aforesaid limitation(s) or exclusion(s) may not apply to the purchaser.
This warran ty gives you speci fic legal rights and you may also have other rights which vary from s tate to
state.
bring your RadioShack sa les slip
We Service What We Sell
as proof of purchase date to any
10/95
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
12A6 Printed in China
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