Optimus Speaker 12 Dec User Manual

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Cat. No. 12-2012  
OWNER’S MANUAL  
Please read before using this equipment.  
Electronic Subwoofer  
Crossover  
 
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INSTALLATION  
You can easily connect this cross-  
over. However, improper connec-  
tions can damage your crossover and  
other components in your autosound  
system, and possibly your vehicle’s  
electrical system. Before you begin,  
you should know:  
• Set the subwoofer amplifier gain  
(input level) and crossover input  
level controls to their midpoints.  
CHOOSING A  
MOUNTING LOCATION  
• Which wire is the power wire in  
your vehicle’s electrical system  
Choose the mounting location for the  
crossover first, but do not mount it un-  
til you have connected the wiring, ad-  
justed the controls, and confirmed  
that the crossover operates properly  
with your system. By choosing the lo-  
cation first, you can later mount the  
crossover without re-routing the  
wires.  
• If your autosound system has  
line-level or speaker-level outputs  
Before you install your crossover,  
carefully read all the installation in-  
structions in this owner’s manual.  
Notes:  
• Use audio patch cables with  
phono-type connectors (avail-  
able at your local RadioShack  
store) to complete the low level  
input/output connections.  
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)  
• Use your autosound system’s  
speaker wires to complete the  
high level input connections.  
• Does not interfere with the opera-  
tion of the vehicle  
• Use 18-gauge wire (available at  
your local RadioShack store) to  
complete the power connections.  
• Is not directly in front of a heating  
vent  
• Allows drilling of mounting holes  
without damaging other vehicle  
components  
• Turn your autosound system’s  
volume all the way down before  
installation.  
• Allows convenient and safe rout-  
ing of wires  
3
 
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reduces the possibility of damage  
to your crossover or autosound  
system during installation.  
CONNECTING INPUT/  
OUTPUT  
Note: After you complete the  
connections and reconnect the  
battery cable, you will need to re-  
set all clock/memory devices in  
your vehicle.  
2. Connect your autosound sys-  
tem’s L (left) and R (right) outputs  
L
R
to the crossover’s  
INPUT  
(left) and  
(right)  
jacks.  
This crossover has both speaker-  
level and line-level inputs. If your  
autosound system has line-level  
LOW LEVEL  
outputs, use the two  
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– R+  
, L– to , R+ to , and R– to  
R–  
).  
LOW LEVEL  
Use either the  
or  
HIGH LEVEL  
input terminals, but  
Note: Be sure to correctly match the  
input and output connections (left out-  
put to left input, and right output to  
right input).  
not both.  
L
3. Connect the crossover’s  
(left)  
R
OUTPUT  
jacks to the  
and (right)  
L (left) and R (right) inputs of the  
amplifier that drives the sub-  
woofer speakers.  
1. Disconnect the negative (–) cable  
from your vehicle’s battery. This  
4
 
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4. Connect your autosound sys-  
tem’s switched power lead wire  
(usually orange) to the cross-  
CONNECTING POWER  
REMOTE  
over’s  
terminal. This  
turns the crossover on and off  
when you turn your autosound  
system on and off.  
Note: If your autosound system  
does not have 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 vehi-  
cle battery’s negative (–) terminal.  
1. Ensure the negative (–) cable is  
disconnected from your vehicle’s  
battery.  
GND  
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 insu-  
lated from the vehicle’s frame by  
a non-metallic part.  
B+12V  
3. Connect the crossover’s  
(power) terminal directly to the  
vehicle battery’s +12 volt termi-  
nal.  
5
 
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TESTING THE  
CONNECTIONS  
ADJUSTING THE  
CONTROLS  
Follow these steps to check your au-  
tosound system before adjusting and  
mounting the crossover.  
1. Turn on your autosound system  
and adjust the volume to a com-  
fortable level. The POWER indi-  
cator 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 there  
is no sound from a speaker), turn  
off the power immediately, then  
check the wiring connections.  
Setting the Low Pass  
Crossover Point  
If the system sounds with no dis-  
tortion or static, proceed to “Ad-  
justing the Controls.”  
LOW PASS  
The  
selector lets you set  
one of three crossover points. All sig-  
nals at or below the selected frequen-  
cy “cross over” to your subwoofer  
speakers.  
180 Hz  
Set the selector to  
the range of low-frequency sounds.  
90 Hz 50 Hz  
to  
to increase  
Set the selector to  
or  
decrease the range of low-frequency  
sounds.  
6
 
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Adjusting the Input Level  
MOUNTING THE  
CROSSOVER  
The input level controls let you adjust  
the crossover to balance the sub-  
woofer’s sound level with the rest of  
your autosound system.  
After you have correctly connected  
the crossover and set the controls,  
follow these steps to mount the cross-  
over.  
Turn your autosound system up to a  
normal listening level, then use a flat-  
head screwdriver to adjust each IN-  
PUT LEVEL control until the subwoof-  
er is as loud as desired.  
HIGH LEVEL  
Caution: If you use the  
input terminals and turn your auto-  
sound system volume too high for the  
crossover, you could damage the  
crossover. To reduce this possibility,  
set the INPUT LEVEL controls past  
their midpoints.  
1. Using the crossover mounting  
holes as a guide, mark the posi-  
tions for the mounting screw  
holes at the desired location.  
Adjusting the Subwoofer  
Bass Boost  
2. At each marked position, drill a  
9/64-inch (3.57 mm) hole.  
The SUBWOOFER BASS BOOST con-  
trols let you boost 45, 80, or 120 Hz  
subwoofer output by 12 dB to en-  
hance low sounds when desired. Set  
the 45Hz/80Hz/120Hz selector to the  
appropriate position, then set +12dB  
to ON. To return to the normal bass  
setting, set +12dB to OFF.  
Caution: Be careful not to drill  
into anything behind the mounting  
surface.  
3. Attach the crossover at the  
mounting location using the sup-  
plied sheet metal screws, lock-  
washers, and washers.  
7
 
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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  
Dimensions (HWD) .......................... 1 × 39/16 × 51/8 Inches (26 × 92 × 131 mm)  
Weight ........................................................................................ 10.2 oz (290 g)  
Specifications are typical; individual units might vary. Specifications are subject  
to change and improvement without notice.  
RadioShack Limited Warranty  
This product is warranted 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 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  
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 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.  
We Service What We Sell  
10/95  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
12A6  
Printed in China  
 

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