Optimus Owner's Manual
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Optimus Owner's Manual

Optimus Owner's Manual

125 × 4 high power 4-channel trunk mount amplifier
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12-2010.fm Page 1 Tuesday, July 13, 1999 2:10 PM
Cat. No. 12-2010
OWNER'S MANUAL
Please read before using this equipment.
125 x 4 High Power 4-Channel
Trunk Mount Amplifier

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Summary of Contents for Optimus Optimus

  • Page 1 12-2010.fm Page 1 Tuesday, July 13, 1999 2:10 PM Cat. No. 12-2010 OWNER’S MANUAL Please read before using this equipment. 125 x 4 High Power 4-Channel Trunk Mount Amplifier...
  • Page 2 © 1996 Tandy Corporation. All Rights Reserved. Optimus is a registered trademark used by Tandy Corporation. RadioShack is a trademark used by Tandy Corporation.

  • Page 3: Table Of Contents

    12-2010.fm Page 3 Tuesday, July 13, 1999 2:10 PM CONTENTS Preparation......................5 Supplied Hardware ..................5 Before You Begin the Installation ..............5 Choosing a Mounting Location ..............6 Preparing the Mounting Area..............6 Routing Cables and Wires ................. 6 Installation Order....................
  • Page 4 12-2010.fm Page 4 Tuesday, July 13, 1999 2:10 PM Care and Maintenance ..................32 The FCC Wants You to Know ................. 32 Replacing a Fuse.................... 33 Replacing the AGU-Type Fuse ..............33 Replacing a Blade-Type Fuse ..............34 Specifications...................... 35...

  • Page 5: Preparation

    12-2010.fm Page 5 Tuesday, July 13, 1999 2:10 PM PREPARATION SUPPLIED HARDWARE Your amplifier comes with the following items. Be sure you locate these items before you store the packing materials. (illustration - show all amplifier parts and hardware) BEFORE YOU BEGIN THE INSTALLATION Before you install your amplifier, read all the instructions in this owner’s manual.

  • Page 6: Choosing A Mounting Location

    12-2010.fm Page 6 Tuesday, July 13, 1999 2:10 PM Choosing a Mounting Routing Cables and Wires Location Avoid routing the connection cables and any speaker wires near moving The ideal location for mounting the am- parts or sharp edges. You can usually plifier is in your vehicle’s trunk.

  • Page 7: Before You Make The Connections

    12-2010.fm Page 7 Tuesday, July 13, 1999 2:10 PM BEFORE YOU MAKE THE CONNECTIONS (illustration) The supplied connection cables in- clude all the lead wires you need to connect the amplifier to your existing autosound system, ground, and pow- • Be sure your speakers can handle as much as 500 watts of power (250 watts per channel if you con- Important: Do not cut these wires.

  • Page 8: Connecting Ground And Switched/Primary Power

    12-2010.fm Page 8 Tuesday, July 13, 1999 2:10 PM CONNECTING GROUND 3. Connect the black ground wire’s other end to a chassis ground, AND SWITCHED/ such as a metal bolt attached to a PRIMARY POWER metal part of the vehicle’s frame. Be sure the bolt is not insulated Follow these steps to connect the am- from the chassis by a plastic part.
  • Page 9 12-2010.fm Page 9 Tuesday, July 13, 1999 2:10 PM This connection turns on the 7. Connect the other end of the red amplifier when you turn on the power cable (with in-line fuse autosound system, and turns off holder) to your vehicle’s battery’s the amplifier when you turn off the positive (+) battery cable terminal autosound system.

  • Page 10: Connecting Inputs

    12-2010.fm Page 10 Tuesday, July 13, 1999 2:10 PM CONNECTING INPUTS LOW LEVEL INPUTS If your autosound system has low level phono output jacks, use this chart to find the page number in this manual that has the appropriate instructions for connecting your amplifier’s low level phono input jacks to your autosound system.

  • Page 11: Four Phono Output Jacks/Four Speakers

    12-2010.fm Page 11 Tuesday, July 13, 1999 2:10 PM Four Phono Output Jacks/Four Speakers (illustration) 1. Connect the system’s front left phono output plug to the amplifier’s jack. 2. Connect the system’s front right phono output plug to the amplifier’s jack.

  • Page 12: Four Phono Output Jacks/Two Speakers

    12-2010.fm Page 12 Tuesday, July 13, 1999 2:10 PM Four Phono Output Jacks/Two Speakers (illustration) Connect the system’s front left phono output plug to the amplifier’s jack. Then connect the system’s front right phono output plug to the amplifier’s jack. Or , connect the system’s rear left phono output plug to the amplifier’s jack.

  • Page 13: Two Phono Output Jacks/Four Speakers

    12-2010.fm Page 13 Tuesday, July 13, 1999 2:10 PM Two Phono Output Jacks/Four Speakers (illustration) Note: For the best results, use two shielded phono plugs-to-phono jack Y-adapter audio cables such as Cat. No. 42-2435 (not supplied). 1. Connect one of the cable’s Y-plug ends to the amplifier’s jack.

  • Page 14: Two Phono Output Jacks/Two Speakers

    12-2010.fm Page 14 Tuesday, July 13, 1999 2:10 PM Two Phono Output Jacks/Two Speakers (illustration) Connect the system’s left phono output plug to the amplifier’s jack. Then con- nect the system’s right phono output plug to the amplifier’s jack. Or , connect the system’s left phono output plug to the amplifier’s jack.

  • Page 15: High Level (Speaker Wire) Inputs

    12-2010.fm Page 15 Tuesday, July 13, 1999 2:10 PM HIGH LEVEL (SPEAKER WIRE) INPUTS If your autosound system does not have low level phono output jacks but has only speaker outputs, choose the section which has the appropriate instructions to con- nect your autosound system’s speaker outputs to the amplifier.

  • Page 16: Four Speaker Outputs

    12-2010.fm Page 16 Tuesday, July 13, 1999 2:10 PM Four Speaker Outputs Floating Ground Connection (illustration - show connections made with CH1/CH2 and CH3/CH4 wire harnesses between autosound system’s speaker outputs and amp’s HIGH INPUT CH1/CH2 and HIGH INPUT CH3/CH4 jacks) Common Ground Connection (illustration - show connections made with CH1/CH2 and CH3/CH4 wire harnesses between autosound system’s speaker outputs...

  • Page 17: Two Speaker Outputs

    12-2010.fm Page 17 Tuesday, July 13, 1999 2:10 PM Two Speaker Outputs Floating Ground Connection (illustration - show connections made with CH1/CH2 and CH3/CH4 wire harnesses between autosound system’s speaker outputs and amp’s HIGH INPUT CH1/CH2 and HIGH INPUT CH3/CH4 jacks) Common Ground Connection (illustration - show connections made with CH1/CH2 and CH3/CH4 wire harnesses between autosound system’s speaker outputs...

  • Page 18: Connecting Speakers

    12-2010.fm Page 18 Tuesday, July 13, 1999 2:10 PM CONNECTING SPEAKERS PREPARING THE SPEAKER WIRES Caution: You must connect a sepa- rate wire to each speaker terminal as (illustration) described in the following procedures. Do not use a common wire or chassis ground for any speaker connection.

  • Page 19: Four Speakers (Unbridged Connection)

    12-2010.fm Page 19 Tuesday, July 13, 1999 2:10 PM Four Speakers (Unbridged Connection) (illustration - show connections made between speaker wires and amplifier’s BRIDGED CH +/- terminals) Note: Although the amplifier’s speaker terminals are labeled as bridged terminals, you still use them for this unbridged connection. Follow these steps if your autosound system has four speakers and you are not connecting a subwoofer.

  • Page 20: Two Speakers (Unbridged Connection)

    12-2010.fm Page 20 Tuesday, July 13, 1999 2:10 PM Two Speakers (Unbridged Connection) (illustration - show connections made between speaker wires and amplifier’s BRIDGED CH +/- terminals) If you are connecting two speakers and you are not connecting a subwoofer, you can connect the speakers to the amplifier’s front ( BRIDGED CH1 BRIDGED CH2...

  • Page 21: Two Speakers (Bridged Connection)

    12-2010.fm Page 21 Tuesday, July 13, 1999 2:10 PM 1. Connect one end of a speaker wire’s marked conductor to the amplifier’s terminal. BRIDGED + CH1 BRIDGED + CH3 2. Connect the other end of the wire to the left speaker’s positive (+) terminal. 3.
  • Page 22 12-2010.fm Page 22 Tuesday, July 13, 1999 2:10 PM Caution: This connection produces 250 watts per channel. Use this connection only if you have high quality speakers capable of handling a power output of 250 watts. 1. Connect one end of a speaker wire’s marked conductor to the amplifier’s terminal.

  • Page 23: Two Unbridged Speakers And One Unbridged Subwoofer

    12-2010.fm Page 23 Tuesday, July 13, 1999 2:10 PM Two Unbridged Speakers and One Unbridged Subwoofer (illustration - show connections made between speaker and subwoofer’s wires and amplifier’s BRIDGED CH +/- terminals) If you are connecting two speakers and a subwoofer, you can connect the speakers to the amplifier’s front ( ) or rear ( ) speaker terminals.

  • Page 24: Two Unbridged Speakers And One Bridged Subwoofer

    12-2010.fm Page 24 Tuesday, July 13, 1999 2:10 PM Two Unbridged Speakers and One Bridged Subwoofer (illustration - show connections made between speaker and subwoofer’s wires and amplifier’s BRIDGED CH +/- terminals) If you are connecting two speakers and a subwoofer, you can bridge (add) the power output of the amplifier’s other two channels to produce the combined power of both from the subwoofer.

  • Page 25: Two Bridged Subwoofers

    12-2010.fm Page 25 Tuesday, July 13, 1999 2:10 PM Two Bridged Subwoofers (illustration) If you are connecting two subwoofers, you can bridge (add) the power output of all of the amplifier’s channels to send all of the amplifier’s power through both subwoof- ers.

  • Page 26: Completing The Installation

    12-2010.fm Page 26 Tuesday, July 13, 1999 2:10 PM COMPLETING THE INSTALLATION TESTING THE MOUNTING THE CONNECTIONS AMPLIFIER Before you mount the amplifier, make Be sure you verify that the amplifier is sure you have securely made all con- connected properly (see “Testing the nections before continuing with the in- Connections”).
  • Page 27 12-2010.fm Page 27 Tuesday, July 13, 1999 2:10 PM 4. Drill -inch holes in the marked locations, being careful not to damage anything behind mounting surface. 5. Attach the amplifier to the mount- ing surface using the supplied sheet metal screws and washers. (illustration) 6.

  • Page 28: Operation

    12-2010.fm Page 28 Tuesday, July 13, 1999 2:10 PM OPERATION TURNING ON THE AMPLIFIER The amplifier automatically turns on a few seconds after you turn your vehicle’s ig- nition switch to ACC or ON and turn on your autosound system (depending on how you installed the amplifier).

  • Page 29: Adjusting Frequency Crossover

    12-2010.fm Page 29 Tuesday, July 13, 1999 2:10 PM 3. Adjust ADJUSTING CH1/CH2 LEVEL (MIN/MAX) CH3/CH4 LEVEL (MIN/MAX) FREQUENCY a comfortable listening level. CROSSOVER 4. Turn up the autosound system’s If you installed one or more subwoof- volume control until the sound ers and therefore set X-OVER FREQ begins to distort.

  • Page 30: Troubleshooting

    12-2010.fm Page 30 Tuesday, July 13, 1999 2:10 PM TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE SUGGESTION No power – the ampli- • Power problem. • Check the amplifier’s fier’s POWER indicator and autosound sys- does not light after the tem’s fuses and vehicle’s autosound sys- replace them if nec- tem is turned on.
  • Page 31 12-2010.fm Page 31 Tuesday, July 13, 1999 2:10 PM SYMPTOM POSSIBLE CAUSE SUGGESTION No sound (continued) • Power problems. • Check the amplifier’s and autosound sys- tem’s fuses and replace them if nec- essary (see “Replac- ing a Fuse” on Page 33).

  • Page 32: Care And Maintenance

    12-2010.fm Page 32 Tuesday, July 13, 1999 2:10 PM CARE AND MAINTENANCE Your Optimus 125 × 4 High Power 4-Channel 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 33: Replacing A Fuse

    12-2010.fm Page 33 Tuesday, July 13, 1999 2:10 PM REPLACING A FUSE 2. Push together and twist the fuse holder’s parts on the red power cable until they spring apart. Then If the amplifier does not operate, you remove the fuse if it is blown. might need to replace the red power cable’s 70-amp AGU-type fuse and one or both of the 35-amp blade-type...

  • Page 34: Replacing A Blade-Type Fuse

    12-2010.fm Page 34 Tuesday, July 13, 1999 2:10 PM Replacing a Blade-Type Fuse 3. If the fuse is blown, replace it, Use only a blade-type fuse with the 1. Disconnect the cable from the proper rating. The fuse must be vehicle battery’s negative (–) ter- 35 amps.

  • Page 35: Specifications

    12-2010.fm Page 35 Tuesday, July 13, 1999 2:10 PM SPECIFICATIONS 10% THD Output Power @ 14.4 VDC 1 kHz (4 Channel Mode) ................. 125 Watts x 4 (Bridged Mode) ................250 Watts x 2 Frequency Response ............. 20–20,000 Hz (±3 dB) Input Impedance Low Input ....................10 kOhms High Input....................100 Ohms...
  • Page 36 12-2010.fm Page 36 Tuesday, July 13, 1999 2:10 PM Limited One-Year Warranty This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for one (1) year from the date of purchase from RadioShack company-owned stores and autho- rized RadioShack franchisees and dealers.

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