Advertisement

Quick Links

2 X 50 Watt Truck Amp
The Optimus 2 x 50 Watt Trunk Mount Amplifier is designed to give added
punch and power to your automobile's existing stereo system.
amplifier produces up to 50 watts per channel of clean, powerful sound at
all audio frequencies with minimum distortion.
Other features include:
Automatic Power Switching - Powers the amplifier when you
High or Low-Level Input Signal Compatible - Accepts either high-level
Thermal Overload Protection - Automatically shuts down the
14k Gold-Plated Color Speaker Terminals - High conductivity and minimum
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.
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.
(120-1971)
Full MOSFET Power Supply - Produces enough power to
Input Level Control - Lets you adjust the level
Features
supply the main amplifier and
has a considerable amount of
reserve power for peak "high
demand" situations.
turn on/off your automobile's
stereo system.
(speaker) or low-level (pre-
amplifier) input signals to
match your stereo system's
output for best performance.
(high or low) of audio
signals that enter the
amplifier.
amplifier when it overheats
or when its load or DC power
output is shorted.
impedance.
Contact your
Faxback Doc. # 8286
The

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 120-1971 and is the answer not in the manual?

Questions and answers

Summary of Contents for Optimus 120-1971

  • Page 1 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. amplifier produces up to 50 watts per channel of clean, powerful sound at all audio frequencies with minimum distortion.
  • Page 2 Do not modify the amplifier's wiring as this voids its warranty. For your permanent records, we suggest you record the amplifier's serial number. The number is on the bottom of the amplifier.
  • Page 3: Choosing A Mounting Location

    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.
  • Page 4 The Amp is overheated. The speaker wires are shorted. The speaker's impedance is below the rated output impedance. The output power terminals are shorted/loaded down. The unit is broken.
  • Page 5 2 X 50 Watt Truck Amp (120-1971) Connecting Power Faxback Doc. # 6714 Follow these steps to connect power to the amplifier. Disconnect the positive (+) wire from your vehicle's battery. This reduces the possibility of damage to your system during installation.
  • Page 6: High-Level Input

    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.
  • Page 7 HIGH INPUT L and R terminals. NOTE: Be sure you connect the + and - terminal correctly. If the stereo system has only three wires, connect the common speaker wires to both of the amplifier's L and R negative terminals. Connect the left speaker's positive (+) wire to the amplifier's (+) left terminal.
  • Page 8: Turning On The Amplifier

    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. Using the mounting holes on the amplifier as a guide, mark the locations for the mounting holes.
  • Page 9: Listening Safely

    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. this happens, turn off your sound system and let the amplifier cool down before you restart.
  • Page 10 2 X 50 Watt Trunk Amp (120-1971) Troubleshooting Faxback Doc. # 17062 Green lights fade at power-up and the unit loses power. Check the 12 V power lead to make sure when you turn on the remote switch on, the voltage level doesn’t drop.
  • Page 11 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.
  • Page 12 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...
  • Page 13 Audio Connection Information (120-Series) Plug/Male 2 Ch. System Faxback Doc.# 19994 +----+--------------+---------------+------------+------------------------+ |Pin | |No. | WIRE COLOR WIRE SPECS. LABEL REMARK +----+--------------+---------------+------------+------------------------+ WHT/BLK AWG #20 FRONT L- STRIP SOLDER 2P CORD +----+--------------+---------------+------------+------------------------+ GRY/BLK " FRONT R- " +----+--------------+---------------+------------+------------------------+ +----+--------------+---------------+------------+------------------------+ +----+--------------+---------------+------------+------------------------+ BLACK AWG 206...
  • Page 14 (2CH/4CH SWITCHABLE UNIT) +----+--------------+---------------+------------+------------------------+ |Pin | |No. | WIRE COLOR WIRE SPECS. LABEL REMARK +----+--------------+---------------+------------+------------------------+ WHT/BLK AWG #20 FRONT L- STRIP SOLDER 2P CORD +----+--------------+---------------+------------+------------------------+ GRY/BLK " FRONT R- " +----+--------------+---------------+------------+------------------------+ GRN/BLK " REAR L- " +----+--------------+---------------+------------+------------------------+ VIO/BLK " REAR R- "...
  • Page 15 |Pin | |No. | WIRE COLOR WIRE SPECS. LABEL REMARK +----+--------------+---------------+------------+------------------------+ WHT/BLK AWG #20 FRONT L- STRIP SOLDER 2P CORD +----+--------------+---------------+------------+------------------------+ GRY/BLK " FRONT R- " +----+--------------+---------------+------------+------------------------+ GRN/BLK " REAR L- " +----+--------------+---------------+------------+------------------------+ VIO/BLK " REAR R- " +----+--------------+---------------+------------+------------------------+ BLACK AWG 206 GROUND 6.3mm r FORK TERMINAL |...
  • Page 16 +---------+--------------+ White Right (-) +---------+--------------+ Brown Left (+) +---------+--------------+ Gray Left (-) +---------+--------------+ +12 V Power | +---------+--------------+ REAR +---------+--------------+ | GRN/BLK | Right (+) +---------+--------------+ | WH/BLK | Right (-) +---------+--------------+ | BR/BLK | Left (+) +---------+--------------+ |GRAY/BLK | Left (-) +---------+--------------+ +---------+--------------+ | Orange...

Table of Contents