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Radio Shack 85 Owner's Manual

85 × 4 high power 4-channel trunk mount amplifier
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12-1977.fm Page 1 Tuesday, July 13, 1999 10:07 AM
Cat. No. 12-1977
OWNER'S MANUAL
Please read before using this equipment.
85
4 High Power 4-Channel
Trunk Mount Amplifier

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Summary of Contents for Radio Shack 85

  • Page 1 12-1977.fm Page 1 Tuesday, July 13, 1999 10:07 AM Cat. No. 12-1977 OWNER’S MANUAL Please read before using this equipment. 4 High Power 4-Channel Trunk Mount Amplifier...
  • Page 2 © 1995 Tandy Corporation. Optimus and Radio Shack are registered trademarks used by Tandy Corporation. Input Level Controls the level of the audio signals that en- ter the amplifier.
  • Page 3 340 watts of power (170 watts per channel if you connect the autosound system to one pair of speakers, or 85 watts per channel if you connect the autosound system to two pairs of speakers). Each speaker must have an impedance of pro- at least 4 ohms.

  • Page 4: Table Of Contents

    12-1977.fm Page 4 Tuesday, July 13, 1999 10:07 AM CONTENTS Preparation ... 5 Choosing a Mounting Location ... 5 Before You Begin the Installation ... 5 Connecting Ground and Primary/Switched Power ... 6 Connecting to Your Autosound System ... 8 Low Level Input Connections ...

  • Page 5: Preparation

    • Do not cut any of the amplifier’s wires. If you cut any wire, you cannot obtain a refund or exchange on this product. Radio Shack will provide warranty service if you cut a wire and find the product is defective.

  • Page 6: Connecting Ground And Primary/Switched Power

    • Turn on the power to test the connections before you permanently mount the amplifier (see “Testing the Power Connections”). • Be sure your speakers can handle 85 watts per channel, if you connect the autosound system to two pairs of speakers (or 170 watts per channel if you connect the autosound system to only one pair of speakers).
  • Page 7 12-1977.fm Page 7 Tuesday, July 13, 1999 10:07 AM 2. Securely connect the supplied dark blue/white wire’s spade connector end to the amplifier’s terminal. 3. Connect the dark blue/white wire’s other end to your autosound system’s switched power lead using a twist-on terminal connector (such as Cat.

  • Page 8: Connecting To Your Autosound System

    12-1977.fm Page 8 Tuesday, July 13, 1999 10:07 AM CONNECTING TO YOUR AUTOSOUND SYSTEM Low Level Input Connections You can connect your autosound system’s low-level phono output jacks to the amplifier’s low-level phono input jacks. For the best results, use shielded audio cables, such as Cat.
  • Page 9 12-1977.fm Page 9 Tuesday, July 13, 1999 10:07 AM If your autosound system has four phono outputs but you are using only two speakers (front or rear) , connect only the autosound system’s correspond- ing output jacks to the amplifier using audio cables as follows: •...
  • Page 10 12-1977.fm Page 10 Tuesday, July 13, 1999 10:07 AM If your autosound system has only two phono output jacks (left and right) and you are using four speakers, use two Y-adapter audio cables to make the connections as follows: Note: For the best results, use shielded phono plug-to-phono plug Y- adapter audio cables, such as Cat.

  • Page 11: High-Level Input Connections

    12-1977.fm Page 11 Tuesday, July 13, 1999 10:07 AM If your autosound system has only two phono output jacks (left and right) and you are using only two speakers, simply connect them to the amplifier’s corresponding High-Level Input Connections If your autosoiund system has only speaker outputs, you can connect them to the amplifier’s HIGH INPUT CH4 CH3 floating ground connection or the common ground connection method.
  • Page 12 12-1977.fm Page 12 Tuesday, July 13, 1999 10:07 AM If your autosound system has four speaker outputs and you are going to use four speakers: Floating Ground Connection Common Ground Connection...
  • Page 13 12-1977.fm Page 13 Tuesday, July 13, 1999 10:07 AM If your autosound system has only two speaker outputs and you are going to use four speakers: Floating Ground Connection Common Ground Connection...

  • Page 14: Connecting The Speakers

    Note: Speaker wires have two conductors. Color-coded wires have a stripe run- ning down one of the conductors or different colored insulation for each conduc- tor. Your local Radio Shack store has a wide selection of speaker wire to choose from.

  • Page 15: Connecting Four Speakers

    12-1977.fm Page 15 Tuesday, July 13, 1999 10:07 AM Connecting Four Speakers 1. Connect one end of a speaker wire’s marked conductor to the amplifier’s terminal (front-left positive). CH1 + 2. Connect the unmarked conductor’s end to the amplifier’s (front-left negative). 3.

  • Page 16: Connecting Two Speakers (Unbridged Connection)

    ( ) or rear ( Caution: This is an unbridged connection that produces 85 watts per channel. If you do not have high power speakers, use this connection. 1. Connect one end of a speaker wire’s marked conductor to the amplifier’s (front-left positive) or 2.

  • Page 17: Connecting Two Speakers (Bridged Connection)

    12-1977.fm Page 17 Tuesday, July 13, 1999 10:07 AM Connecting Two Speakers (Bridged Connection) If you are connecting only two speakers (left and right), you can add (bridge) the power output of two channels (front and back) to produce the combined power of both from each of the two speakers.

  • Page 18: Connecting Two Unbridged Speakers And One Unbridged Subwoofer

    12-1977.fm Page 18 Tuesday, July 13, 1999 10:07 AM Connecting Two Unbridged Speakers and One Unbridged Subwoofer 1. Connect the two speakers to the to the terminals (rear speakers). 2. For an unbridged connection, connect the subwoofer to the amplifier’s terminals (if you used the front speaker connections in Step 1) or the terminals (if you used the rear speaker connections in Step 1 3.

  • Page 19: Connecting Two Unbridged Speakers And One Bridged Subwoofer

    12-1977.fm Page 19 Tuesday, July 13, 1999 10:07 AM Connecting Two Unbridged Speakers and One Bridged Subwoofer 1. Connect the two speakers to the to the terminals (rear speakers). 2. For a bridged connection, connect the subwoofer to the amplifier’s terminals (if you used the front speaker connections in Step 1) or the tions in Step 1).

  • Page 20: Testing The Connections

    12-1977.fm Page 20 Tuesday, July 13, 1999 10:07 AM TESTING THE CONNECTIONS Before you permanently mount the amplifier, connect your vehicle battery’s neg- ative ( ) cable, turn your vehicle’s ignition to ON or ACC, then test the connec- tions. The amplifier is properly connected to the autosound system and speakers if you can verify that the amplifier and the autosound system turn on properly and the speakers’...

  • Page 21: Mounting The Amplifier

    12-1977.fm Page 21 Tuesday, July 13, 1999 10:07 AM MOUNTING THE AMPLIFIER Before you begin mounting the amplifier, make sure you have the following sup- plied hardware necessary for mounting. • 6 sheet-metal screws • 6 spring washers • 6 flat washers Then confirm that the amplifier fits your vehicle’s mounting area.
  • Page 22 12-1977.fm Page 22 Tuesday, July 13, 1999 10:07 AM 3. Using the mounting holes on the amplifier as a guide, mark the locations for the mounting holes. 4. Drill -inch holes in the marked locations, being careful not to damage anything behind the mounting surface.

  • Page 23: Operation

    12-1977.fm Page 23 Tuesday, July 13, 1999 10:07 AM OPERATION TURNING ON THE AMPLIFIER The amplifier automatically turns on whenever you turn your vehicle’s ignition switch to ACC or ON. POWER lights when the amplifier is operating. SETTING THE LEVEL CONTROL For the best performance, you can adjust the level of audio signals that enter the amplifier by following these steps.

  • Page 24: Using The Frequency Crossover

    12-1977.fm Page 24 Tuesday, July 13, 1999 10:07 AM 2. Temporarily turn up the autosound system’s volume control to about one- third of its full range. Caution: Never turn the level controls up any farther than you need to get clear sound at two thirds volume maximum.

  • Page 25: Maintenance

    12-1977.fm Page 25 Tuesday, July 13, 1999 10:07 AM MAINTENANCE Your Optimus 85 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 (product name) so you can enjoy it for years.

  • Page 26: Replacing The Fuses

    12-1977.fm Page 26 Tuesday, July 13, 1999 10:07 AM REPLACING THE FUSES If the amplifier shuts down, you might need to replace the power wire’s 50-amp tube-type fuse, either of the two 25-amp blade-type fuses on the back panel, or all three fuses.

  • Page 27: Specifications

    12-1977.fm Page 27 Tuesday, July 13, 1999 10:07 AM SPECIFICATIONS 10% THD Output Power @ 14.4 VDC 1 kHz (4 Channel Mode) ... 85 W (Bridged Mode) ...170 Watts Frequency Response ...20–20,000 Hz (±3 dB) Input Impedance Low Input ...10 kOhms High Input ...
  • Page 28 Within this period, we will repair it without charge for parts and labor. Simply bring your Radio Shack sales slip as proof of purchase date to any Radio Shack store. Warranty does not cover transportation costs. Nor does it cover a product subjected to misuse, accidental damage, alteration or improper installation.

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12-1977

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