Radio Shack Trunk Mount Manuale utente

Cat. No. 12-1976

OWNER’S MANUAL

Please read before using this equipment.

4 ×25 Watt

Trunk Mount Amplifier

4-Channel 100-Watt

12-1976.fm Page 1 Tuesday, July 13, 1999 10:01 AM

FEATURES

Optimus and Radio Shack are registered trademarks used by Tandy Corporation.

Your Optimus 4 ×25 Watt Trunk

Mount Amplifier is designed to pro-

duce a total of 100 watts to give add-

ed punch and power to your vehicle’s

existing stereo system.

The amplifier produces up to 25

watts per channel of clean, powerful

sound at all audio frequencies with

minimum distortion. And, you can

connect line-level as well as speaker

outputs to the amplifier.

Its features include:

14k Gold-Plated Noise-Isolated

Line-Level Input Jacks -let you

connect low-level (pre-amplifier) sig-

nal inputs to match your autosound

system’s output for the best high-fi-

delity performance.

14k Gold-Plated Speaker Termi-

nals -designed for low impedance,

high conductivity, and minimum cor-

rosion to provide the highest signal

transfer and lowest sound distortion.

Input Level Control - letsyou adjust

the level (high or low) of the audio

signals that enter the amplifier.

Automatic Power Switchin

-auto-

matically turns on/off the amplifier

when you turn on/off your autosound

system.

Short Circuit Protection -distorts

sound if any output channel shorts to

protect the amplifier from damage.

Power Indicator -lights when power

is on.

Note: If the connectors from your au-

tosound system are not compatible

with the amplifier’s connectors, your

local Radio Shack store sells adapter

harnesses for many vehicles.

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CONTENTS

Preparation ..................................................................................................... 4

Choosing a Mounting Location .................................................................. 4

Before You Begin the Installation ............................................................... 4

Connecting Ground and Primary/Switched Power .................................... 5

Connecting Your Autosound System ......................................................... 7

Low Level Input Connections .............................................................. 7

High-level Input Connections ............................................................ 10

Connecting the Speakers ........................................................................ 13

Preparing the Speaker Wires ............................................................ 13

Connecting Four Speakers ................................................................ 14

Connecting Two Speakers ................................................................ 15

Testing the Connections .......................................................................... 16

Mounting the Amplifier ............................................................................. 16

Operation ...................................................................................................... 18

Turning On the Amplifier .......................................................................... 18

Setting the Level Control ......................................................................... 18

Maintenance .................................................................................................. 20

Replacing the Fuses ................................................................................ 21

Replacing the Tube-Type Fuse ......................................................... 21

Replacing the Blade-Type Fuse ........................................................ 21

Specifications ............................................................................................... 22

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PREPARATION

CHOOSING A MOUNTING LOCATION

The ideal location for mounting the amplifier is in your vehicle’s trunk. Wherever

you decide to mount it, choose a mounting location that:

• 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 for proper airflow and cooling

Warnin

: The amplifier gets very hot while it is on. Do not touch the amplifier or

place flammable objects near it while it is on.

BEFORE YOU BEGIN THE INSTALLATION

Before you install your amplifier, carefully read all the instructions in this owner’s

manual. You should be able to answer all ofthese questions about your vehicle’s

electrical and sound systems.

• Does my vehicle have a 12-volt negative ground system? (If it does not, you

cannot use this amplifier.)

• Which of the amplifier’s wires is the power wire?

• How do I connect a wire to the fuse box?

• Which amplifier terminals are line-level inputs, which are speaker-level

inputs, and which are speaker outputs?

Important!

• Be aware that installation in your vehicle may require cutting or modifying

your vehicle.

• 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.

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Cautions:

• To prevent damage to your amplifier or autosound system, you must first

connect the ground, primary, and switched power wires (as described in

“Connecting Ground and Primary/Switched Power” before you connect the

speakers to the amplifier. Make the connections only in the order shown.

Damage to the amplifier is possible if you connect any wire incorrectly.

• 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 25 watts per channel if you connect the

autosound system to two pairs of speakers (or 50 watts per channel if you

connect the autosound system to only one pair of speakers). Each speaker

must have an impedance of at least 4 ohms. Your local Radio Shack store

carries a full line of speakers to choose from.

CONNECTING GROUND AND PRIMARY/SWITCHED

POWER

1. To prevent damage to your amplifier or autosound system while making the

connections, disconnect the negative (-) cable from your vehicle’s battery.

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Note: After you complete the connections and reconnect the battery wire,

you will need to reset all clock/timer/memory devices in your vehicle.

2. Connect the supplied dark blue/white wire’s end to the amplifier’s REM

(remote power) terminal.

3. Securely connect the supplied dark blue/white wire’s male quick disconnect

plug to your autosound system’s switched power lead.

This connection turns your amplifier on or off when you turn your autosound

system on or off.

Note: If your autosound system does not have a remote power output lead,

connect this wire to a point in your vehicle’s ignition switch that provides 12-

volt battery power when the ignition is set to ON or ACC. This connection

turns on the amplifier when you turn your ignition switch to on (or to ACC)

and turns off the amplifier when you turn off the ignition.

4. Connect the black wire’s spade connector to the amplifier’s GND terminal.

5. Securely connect the black wire’s eyelet-terminal to a nearby metal ground,

such as a bolt attached to a part of the vehicle’s chassis.

Note: Be sure the bolt is not insulated from the chassis by a plastic part or

other insulating material.

6. Connect the red wire’s spade connector to the amplifier’s +12V terminal.

7. Remove the nut from the battery’s positive (+) terminal bolt, then place the

red wire’s 10A fused eyelet terminal over the end of the bolt.

Caution: Due to the amplifier’s high current requirement, you MUST con-

nect the red wire’s fused end directly to the vehicle’s positive (+) battery

cable terminal or damage to your vehicle’s wiring could result.

Note: Do not reconnect your vehicle battery’s negative (-) cable yet.

12-1976.fm Page 6 Tuesday, July 13, 1999 10:01 AM

CONNECTING YOUR AUTOSOUND SYSTEM

Low Level Input Connections

You can connect your autosound system’s low-level phono output jacks to the

amplifier’s LOW INPUT phono jacks.

Note: For a cleaner, less noisy signal transfer between your autosound system

and the amplifier, the amplifier’s LOW INPUT phono jacks are gold-plated.

For the best results, use shielded audio cables, such as Cat. No. 42-2368 (not

supplied). If your autosound system has only two phono outputs, you will also

need two shielded Y-adapter cables, such as Cat. No. 42-2435 (not supplied).

1. Temporarily place the amplifier as close as possible to the selected mount-

ing location.

If your autosound system has four phono outputs and you are using four

speakers

, connect the autosound system to the amplifier using audio cables

as follows: front-left to FRONT L, front-right to FRONT R, rear-left to REAR L,

and rear-right to REAR R:

12-1976.fm Page 7 Tuesday, July 13, 1999 10:01 AM

If your autosound system has four phono outputs but you are using only two

speakers (front or rear)

, connect only the corresponding autosound sys-

tem’s output jacks to the amplifier using audio cables as follows:

• front-left to FRONT L and front-right to FRONT R, or

• rear-left to REAR L and rear-right to REAR R

12-1976.fm Page 8 Tuesday, July 13, 1999 10:01 AM

If your autosound system has only two phono output jacks

(left and right)

and you are using four speakers,

first connect the single phono plug end of

a Y-adapter shielded audio cable to each autosound system output jack.

Then:

• Connect the other two ends of the left Y-adapter to the amplifier’s corre-

sponding FRONT L and REAR L phono jacks

• Connect the other two ends of the right Y-adapter to the amplifier’s corre-

sponding FRONT R and REAR R phono jacks

12-1976.fm Page 9 Tuesday, July 13, 1999 10:01 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 FRONT L and FRONT R, or REAR L and REAR R phono jacks.

High-Level Input Connections

Ifyour stereo system has onlyspeaker outputs, you can connectthem to the am-

plifier’s rear HIGH INPUT and front HIGH INPUT sockets using the floating ground

connection or the common ground connection method.

12-1976.fm Page 10 Tuesday, July 13, 1999 10:01 AM

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