Optimus Stereo Amplifier 120 1971 User Manual

2 X 50 Watt Truck Amp (120-1971)  
Features  
Faxback Doc. # 8286  
The Optimus 2 x 50 Watt Trunk Mount Amplifier is designed to give added  
punch and power to your automobile's existing stereo system. The  
amplifier produces up to 50 watts per channel of clean, powerful sound at  
all audio frequencies with minimum distortion.  
Other features include:  
Full MOSFET Power Supply - Produces enough power to  
supply the main amplifier and  
has a considerable amount of  
reserve power for peak "high  
demand" situations.  
Automatic Power Switching - Powers the amplifier when you  
turn on/off your automobile's  
stereo system.  
High or Low-Level Input Signal Compatible - Accepts either high-level  
(speaker) or low-level (pre-  
amplifier) input signals to  
match your stereo system's  
output for best performance.  
Input Level Control - Lets you adjust the level  
(high or low) of audio  
signals that enter the  
amplifier.  
Thermal Overload Protection - Automatically shuts down the  
amplifier when it overheats  
or when its load or DC power  
output is shorted.  
14k Gold-Plated Color Speaker Terminals - High conductivity and minimum  
impedance.  
WARNING: If you live in a high temperature area, we recommend  
you install cooling fans on the amplifier to provide a  
better operating temperature environment. Contact your  
local Radio Shack store for a suitable cooling fan.  
If the connectors on your vehicle or automobile's stereo system are not  
compatible with the amplifier's connectors, contact your local Radio  
Shack store. Radio Shack stores sell adapter harnesses for many vehicles.  
 
2 X 50 Watt Truck Amp (120-1971)  
Preparation  
Faxback Doc. # 6713  
Before you install the amplifier, carefully read all instructions. If you  
are unsure about any part of the installation process, we recommend that  
you have a professional install your amplifier.  
Note the following before you begin installing the amplifier:  
Be sure your vehicle has a 12-volt DC, negative-ground electrical  
system. If it does not, you cannot use this amplifier.  
Before you mount the amplifier, temporarily connect the amplifier  
and test it to be sure it works. Do not permanently mount the  
amplifier until you are sure the connections are correct.  
CHOOSING A MOUNTING LOCATION  
Choose a mounting location that meets the following requirements:  
Does not interfere with the vehicle's operation  
Lets you drill mounting holes without damaging other vehicle  
components  
Allows enough space around the cooling fins to permit reasonable  
airflow and cooling  
INCLUDED WITH THE AMPLIFIER  
The amplifier comes with the following items that are necessary for  
mounting. Be sure to unpack these items before you dispose of the packing  
materials.  
4 Sheet-Metal Screws  
4 Spring Washers  
4 Flat Washers  
OVERLOAD LIGHT  
The overload light comes on when:  
 
1. The Amp is overheated.  
2. The speaker wires are shorted.  
3. The speaker's impedance is below the rated output impedance.  
4. The output power terminals are shorted/loaded down.  
5. The unit is broken.  
 
2 X 50 Watt Truck Amp (120-1971) Connecting Power Faxback Doc. # 6714  
Follow these steps to connect power to the amplifier.  
1. Disconnect the positive (+) wire from your vehicle's battery. This  
reduces the possibility of damage to your system during  
installation.  
NOTE: You must reset the clock, the radio's digital tuner  
memories, and other time/memory devices when you  
reconnect the battery wire after wiring is complete.  
2. Connect the amplifier's black (ground) wire to a nearby part of the  
vehicle's metal frame.  
NOTE: Many modern vehicle parts are made of plastic or other  
materials that do not conduct electricity. You must  
connect the black (ground) wire to a metal part that is  
not insulated from the vehicle's frame by one of these  
non-conducting parts.  
3. Connect the red (power) wire directly to the car battery's + 12-volt  
power source.  
CONNECTING THE SWITCHED POWER LEAD  
Follow these steps to connect the switched power lead.  
1. Connect the supplied orange wire's male quick disconnect plug to  
your car stereo system's switched power output lead.  
2. Connect the orange wire's other end to the amplifier's REM (Remote)  
terminal. With this connection, the amplifier turns on/off when  
you turn on/off your car stereo system.  
 
2 X 50 Watt Truck Amp (120-1971)  
Connecting  
Faxback Doc. # 6715  
You can connect your stereo system to low-or high-level input. If your  
stereo system has RCA outputs, connect it to the amp's low-level input for  
a cleaner, less noisy signal. If your stereo system only has speaker  
outputs, connect it to the amp's high-level input.  
To connect the amplifier to your stereo system, place the amplifier as  
close as possible to the selected mounting location and follow the  
appropriate instructions.  
LOW-LEVEL INPUT  
Your amplifier has gold plated color RCA terminals for low-level input to  
match radios and equalizers with RCA type, line-level outputs.  
NOTE: You need a set of 12-foot RCA cables for dash to trunk  
mounting. We recommend Radio Shack Cat. No. 43-2356.  
Follow these steps to connect the stereo system's RCA jacks to the  
amplifier's LOW INPUT terminals:  
1. Plug the RCA cable into the car stereo system's left and right RCA  
output jacks and connect the other end to the amplifier's left and  
right LOW INPUT terminals.  
2. Connect the left speaker's positive (+) wire to the amplifier's  
positive (+) left terminal.  
3. Connect the left speaker's negative (-) wire to the amplifier's  
negative (-) left terminal.  
4. Repeat Steps 3 and 4 to connect the right speaker to the amplifier's  
right speaker terminal.  
NOTE: We recommend 16 or 18 gauge speaker wire.  
HIGH-LEVEL INPUT  
If your car radio does not have RCA output jacks, connect the speaker  
output from the stereo system to the amplifier following these steps:  
1. Connect the stereo system's speaker wires to the amplifier's  
 
HIGH INPUT L and R terminals.  
NOTE: Be sure you connect the + and - terminal correctly.  
2. If the stereo system has only three wires, connect the common  
speaker wires to both of the amplifier's L and R negative terminals.  
3. Connect the left speaker's positive (+) wire to the amplifier's  
(+) left terminal.  
4. Connect the left speaker's negative (-) wire to the amplifier's  
(-) left terminal.  
5. Repeat Steps 3 and 4 to connect the right speaker to the amplifier's  
right speaker terminal.  
 
2 X 50 Watt Truck Amp (120-1971)  
Mounting  
Faxback Doc. # 6716  
Mount the amplifier as follows in the location you chose earlier. Unplug  
the wiring harnesses to make mounting more convenient.  
1. Using the mounting holes on the amplifier as a guide, mark the  
locations for the mounting holes.  
2. Drill 9/64-inch holes in the marked locations, taking care not  
damage anything behind the mounting surface.  
3. Attach the amplifier to the mounting surface using the supplied  
sheetmetal screws and washers.  
Plug in the wiring harnesses.  
TURNING ON THE AMPLIFIER  
The amplifier automatically turns on whenever you turn on your  
radio/cassette player. The POWER indicator lights when the amplifier is  
on.  
SETTING THE INPUT LEVEL CONTROL  
LEVEL lets you adjust the level of audio signals that enter the amplifier.  
For the best performance, follow these steps to adjust the input level.  
1. Turn LEVEL fully counterclockwise.  
2. Turn on your stereo system and turn up the volume to about one-third  
of its full range. Turn on the ignition, if necessary, to turn on  
the amplifier.  
3. Adjust LEVEL until the volume is at the maximum level you desire  
the radio/tape player to produce.  
4. Adjust the stereo system's volume control to a comfortable listening  
level.  
CAUTIONS: Never turn LEVEL up any farther than you need to get clear  
sound at 2/3 volume.  
The overload red indicator illuminates under the following  
conditions:  
 
The amplifier is overheated.  
The speaker wires are shorted.  
The ground wire is open.  
The speaker's impedance is above or below the rated output  
impedance.  
The Amplifier's overload protection circuit automatically  
shuts down when any one of the above conditions occurs. If  
this happens, turn off your sound system and let the  
amplifier cool down before you restart.  
LISTENING SAFELY  
To protect your hearing, follow these guidelines:  
Do not listen at extremely high volume levels. Extended, high  
volume listening can lead to permanent hearing loss.  
Always start by setting the volume to the lowest level possible  
before you begin listening then gradually increase the volume as  
necessary.  
Once you set the volume, do not increase it. Over a period of time,  
your ears adapt to the volume level, so a volume level that does not  
cause discomfort might still damage your hearing.  
 
2 X 50 Watt Trunk Amp  
(120-1971)  
Troubleshooting  
Faxback Doc. # 17062  
Q: Green lights fade at power-up and the unit loses power.  
A: Check the 12 V power lead to make sure when you turn on the remote  
switch on, the voltage level doesn’t drop. Make sure the power lead  
is heavy gauge wire and that the ground is good. Always use fuse at  
the battery term.  
 
2 X 50 Watt Truck Amp (120-1971)  
Maintenance  
Faxback Doc. # 6717  
The Optimus Trunk Mount Amplifier is an example of superior design and  
craftsmanship. The following suggestions will help you care for your  
amplifier so you can enjoy it for years.  
Keep the amplifier dry. If it gets wet, wipe if dry immediately.  
Liquids can contain minerals that corrode electronic circuits.  
Use and store the amplifier only in normal temperature environment.  
Temperature extremes can shorten the life of electronic devices and  
distort or melt plastic parts.  
Handle the amplifier gently and carefully. Dropping it can damage  
circuit boards and cases and can cause the amplifier to work  
improperly.  
Keep the amplifier away from dust and dirt, which can cause premature  
wear of parts.  
Wipe the amplifier with a damp cloth occasionally to keep it looking  
new. Do not use harsh chemicals, cleaning solvents, or strong  
detergents to clean your amplifier.  
Modifying or tampering with the product's internal components can cause a  
malfunction and invalidate your product's warranty. If your amplifier is  
not performing as it should, take it to your local Radio Shack store for  
assistance.  
 
2 X 50 Watt Truck Amp  
(120-1971)  
Specifications  
Faxback Doc. # 8287  
10% THD Output Power @  
14.4 VDC 1kHz at Stereo Mode:......................................50W x 2  
Frequency Response:...............................20 - 20,000 Hz (+/- 3dB)  
Input Impedance:..................................................10k Ohms  
Input Sensitivity (for 10% THD Output Power):  
Low Input:.............................250mV  
High Input:..............................2.5V  
Power Supply Voltage:................DC 14.4V Negative Ground (10.5 - 16V)  
Matching Speaker Impedance:.....................................4 - 8 Ohms  
Maximum Current Draw:..................................................15A  
Dimensions:................................1 15/16 x 7 3/32 x 9 27/32 inch  
(49 x 180 x 250mm) HWD  
Net Weight:...............................................3.52 lbs (1.6Kg)  
 
Audio Connection Information  
(120-Series)  
Plug/Male 2 Ch. System  
Faxback Doc.# 19994  
+----+--------------+---------------+------------+------------------------+  
|Pin |  
|
|
|
|
|
|
|No. | WIRE COLOR | WIRE SPECS. | LABEL  
REMARK  
+----+--------------+---------------+------------+------------------------+  
| 1 | WHT/BLK  
| AWG #20  
| 2P CORD  
| FRONT L- | STRIP SOLDER  
|
|
|
|
|
|
+----+--------------+---------------+------------+------------------------+  
| 2 | GRY/BLK | FRONT R- |  
+----+--------------+---------------+------------+------------------------+  
| 3 |  
+----+--------------+---------------+------------+------------------------+  
| 4 |  
+----+--------------+---------------+------------+------------------------+  
| 5 | BLACK | AWG 206 | GROUND | 6.3mm r FORK TERMINAL |  
+----+--------------+---------------+------------+------------------------+  
| 6 | ORG/WHT * | | DIMMER | STRIP SOLDER  
+----+--------------+---------------+------------+------------------------+  
| 7 | PINK/WHT * | | PHONE MUTE |  
+----+--------------+---------------+------------+------------------------+  
|
"
"
|
|
|
|
|
|
|
|
|
"
|
"
"
|
| 8 | WHITE  
| AWG #20  
| 2p CORD  
| FRONT L+ |  
|
|
|
|
|
|
"
+----+--------------+---------------+------------+------------------------+  
| 9 | GRAY | FRONT R+ |  
+----+--------------+---------------+------------+------------------------+  
| 10 |  
+----+--------------+---------------+------------+------------------------+  
| 11 |  
+----+--------------+---------------+------------+------------------------+  
|
"
"
|
|
|
|
|
|
|
|
|
RED  
| AWG #20  
|
| +12 V TO | 250/ 1A FUSE & 24M/M |  
| IGNITION | TRANS STRIP SOLDER |  
+----+--------------+---------------+------------+------------------------+  
| 13 | YELLOW  
|
|
"
| +12 V TO | 250/ 1A FUSE STRIP  
| BATTERY | SOLDER  
|
|
|
|
+----+--------------+---------------+------------+------------------------+  
| 14 | DARK BLUE/ |  
"
| AMP REMOTE | WIRE BANDING &  
|
|
|
|
|
|
|
|
|
|
|
|
|
WHITE  
|
|
|
|
| TURN ON |  
| 500mA MAX |  
|+12 V OUTPUT|  
TUBE HEATING  
|
|
+----+--------------+---------------+------------+------------------------+  
* May or may not be present depending on features of individual radios.  
 
(2CH/4CH SWITCHABLE UNIT)  
+----+--------------+---------------+------------+------------------------+  
|Pin |  
|
|
|
|
|
|
|No. | WIRE COLOR | WIRE SPECS. | LABEL  
REMARK  
+----+--------------+---------------+------------+------------------------+  
| 1 | WHT/BLK  
| AWG #20  
| 2P CORD  
| FRONT L- | STRIP SOLDER  
|
|
|
|
|
|
+----+--------------+---------------+------------+------------------------+  
| 2 | GRY/BLK | FRONT R- |  
+----+--------------+---------------+------------+------------------------+  
| 3 | GRN/BLK | REAR L- |  
+----+--------------+---------------+------------+------------------------+  
| 4 | VIO/BLK | REAR R- |  
+----+--------------+---------------+------------+------------------------+  
| 5 | BLACK | AWG 206 | GROUND | 6.3mm r FORK TERMINAL |  
+----+--------------+---------------+------------+------------------------+  
| 6 | ORG/WHT * | | DIMMER | STRIP SOLDER  
+----+--------------+---------------+------------+------------------------+  
| 7 | PINK/WHT * | | PHONE MUTE |  
+----+--------------+---------------+------------+------------------------+  
|
"
"
|
|
"
"
|
|
"
"
|
"
|
"
"
|
| 8 | WHITE  
| AWG #20  
| 2p CORD  
| FRONT L+ |  
|
|
|
|
|
|
"
+----+--------------+---------------+------------+------------------------+  
| 9 | GRAY | FRONT R+ |  
+----+--------------+---------------+------------+------------------------+  
| 10 | GREEN | REAR L+ |  
+----+--------------+---------------+------------+------------------------+  
| 11 | VIOLET | REAR R+ |  
+----+--------------+---------------+------------+------------------------+  
|
"
"
|
|
"
|
|
"
"
|
| 12 |  
RED  
| AWG #20  
|
| +12 V TO | 250/ 1A FUSE & 24M/M |  
| IGNITION | TRANS STRIP SOLDER |  
|
|
+----+--------------+---------------+------------+------------------------+  
| 13 | YELLOW  
|
|
"
| +12 V TO | 250/ 1A FUSE STRIP  
| BATTERY | SOLDER  
|
|
|
|
+----+--------------+---------------+------------+------------------------+  
| 14 | DARK BLUE/ |  
"
| AMP REMOTE | WIRE BANDING &  
|
|
|
|
|
|
|
|
|
|
WHITE  
|
|
|
| TURN ON |  
| 500mA MAX |  
|+12 V OUTPUT|  
TUBE HEATING  
+----+--------------+---------------+------------+------------------------+  
* May or may not be present depending on features of individual radios.  
4 Chnl Unit  
+----+--------------+---------------+------------+------------------------+  
 
|Pin |  
|
|
|
|
|
|
|No. | WIRE COLOR | WIRE SPECS. | LABEL  
REMARK  
+----+--------------+---------------+------------+------------------------+  
| 1 | WHT/BLK  
| AWG #20  
| 2P CORD  
| FRONT L- | STRIP SOLDER  
|
|
|
|
|
|
+----+--------------+---------------+------------+------------------------+  
| 2 | GRY/BLK | FRONT R- |  
+----+--------------+---------------+------------+------------------------+  
| 3 | GRN/BLK | REAR L- |  
+----+--------------+---------------+------------+------------------------+  
| 4 | VIO/BLK | REAR R- |  
+----+--------------+---------------+------------+------------------------+  
| 5 | BLACK | AWG 206 | GROUND | 6.3mm r FORK TERMINAL |  
+----+--------------+---------------+------------+------------------------+  
| 6 | ORG/WHT * | | DIMMER | STRIP SOLDER  
+----+--------------+---------------+------------+------------------------+  
| 7 | PINK/WHT * | | PHONE MUTE |  
+----+--------------+---------------+------------+------------------------+  
|
"
"
|
|
"
"
|
|
"
"
|
"
|
"
"
|
| 8 | WHITE  
| AWG #20  
| 2p CORD  
|
|
|
|
"
+----+--------------+---------------+------------+------------------------+  
| 9 | GRAY | FRONT R+ |  
+----+--------------+---------------+------------+------------------------+  
| 10 | GREEN | REAR L+ |  
+----+--------------+---------------+------------+------------------------+  
| 11 | VIOLET | REAR R+ |  
+----+--------------+---------------+------------+------------------------+  
|
"
"
|
|
"
|
|
"
"
|
| 12 |  
RED  
| AWG #20  
|
| +12 V TO | 250/ 1A FUSE & 24M/M |  
| IGNITION | TRANS STRIP SOLDER |  
|
|
+----+--------------+---------------+------------+------------------------+  
| 13 | YELLOW  
|
|
"
| +12 V TO | 250/ 1A FUSE STRIP  
| BATTERY | SOLDER  
|
|
|
|
+----+--------------+---------------+------------+------------------------+  
"
| AMP REMOTE | WIRE BANDING &  
|
|
|
|
| TURN ON |  
| 500mA MAX |  
|+12 V OUTPUT|  
TUBE HEATING  
+----+--------------+---------------+------------+------------------------+  
* May or may not be present depending on features of individual radios.  
5-Pin DIN  
FRONT  
+---------+--------------+  
| Green | Right (+) |  
 
+---------+--------------+  
| White | Right (-) |  
+---------+--------------+  
| Brown | Left (+)  
+---------+--------------+  
| Gray | Left (-)  
+---------+--------------+  
| Red | +12 V Power |  
|
|
+---------+--------------+  
REAR  
+---------+--------------+  
| GRN/BLK | Right (+)  
+---------+--------------+  
| WH/BLK | Right (-)  
+---------+--------------+  
| BR/BLK | Left (+)  
+---------+--------------+  
|GRAY/BLK | Left (-)  
|
|
|
|
+---------+--------------+  
+---------+--------------+  
| Orange | S.P.L.  
+---------+--------------+  
| Black | Ground  
+---------+--------------+  
|
|
| Red w/ | Memory  
| White | Backup  
|
|
+---------+--------------+  
(CJD/ir-02/28/96)  
LN-03/04  
 

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