Radio Shack 85 Manuel utilisateur

Cat. No. 12-1977

OWNER’S MANUAL

Please read before using this equipment.

85 ×4 Hi

h Power 4-Channel

Trunk Mount Amplifier

12-1977.fm Page 1 Tuesday, July 13, 1999 10:07 AM

FEATURES

Your Optimus 85 ×4 High Power 4-

Channel Trunk Mount Amplifier is de-

signed to produce a total of 340 watts

to give added punch and power to

your vehicle’s existing stereo sys-

tem.

The amplifier produces up to 85

watts per channel of clean, powerful

sound at all audio frequencies with

minimum distortion. You can adjust

the crossover frequency for both

channels 3 and 4 when using only

two speakers and a subwoofer, so

you can emphasize the bass sounds

but not lose the other sounds or pow-

er. You can connect your autosound

system’s line-level or speaker level

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 Controls -let you adjust

the level of the audio signals that en-

ter the amplifier.

Automatic Power Switchin

-auto-

matically turns on/off the amplifier

when you turn on/off your autosound

system.

Brid

Capabilit

-lets you com-

bine the amplifier’s four 85-watt

channels so you can use the system

with only two channels that produce

a total of 170 watts from each chan-

nel.

Crossover Frequenc

Circuit -lets

you adjust the crossover frequency

from 45-400 Hz for both channels

three and four when you use only two

speakers.

Crossover Frequenc

ON/OFF

Switch -lets you set the amplifier to

drive a connected subwoofer.

Automatic Thermal Protection

stem (ATPS) -automatically low-

ers the amplifier’s output power

when the amplifier’s internal temper-

ature reaches 202×F then increases

the output power when the amplifier

cools down.

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

12-1977.fm Page 2 Tuesday, July 13, 1999 10:07 AM

Mute Turn On Circuit -eliminates

the irritating thump noise that some

amplifiers produce when you turn

them on.

Power Indicator -lights when power

is on.

Full MOSFET Power Supply -pro-

duces enough power to supply the

main amplifier and has a consider-

able amount of reserve power for

peak “high demand” situations.

Short Circuit Protection -distorts

sound if any output channel shorts so

you can know to turn off the amplifier.

Important: Be sure your speakers

can handle 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

at least 4 ohms. Your local Radio

Shack store carries a full line of

speakers.

Note: If the connectors on your vehi-

cle stereo 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 ..................................................................................................... 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 .............................................................. 8

High-level Input Connections ............................................................. 11

Connecting the Speakers ........................................................................ 14

Preparing the Speaker Wires ............................................................ 14

Connecting Four Speakers ............................................................... 15

Connecting Two Speakers (Unbridged Connection) ......................... 16

Connecting Two Speakers (Bridged Connection) ............................. 17

Connecting Two Unbridged Speakers

and One Unbridged Subwoofer .................................................. 18

Connecting Two Unbridged Speakers

and One Bridged Subwoofer ...................................................... 19

Testing the Connections .......................................................................... 20

Mounting the Amplifier ............................................................................. 21

Operation ...................................................................................................... 23

Turning On the Amplifier .......................................................................... 23

Setting the Level Control ......................................................................... 23

Using the Frequency Crossover .............................................................. 24

X-Over Freq On/off Switch ................................................................ 24

X-Over Freq Control .......................................................................... 24

Maintenance ................................................................................................. 25

Replacing the Fuses ................................................................................ 26

Replacing the Tube-Type Fuse ......................................................... 26

Replacing a Blade-Type Fuse ........................................................... 26

Specifications ............................................................................................... 27

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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 of these 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 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). 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.

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

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

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2. Securely connect the supplied dark

blue/white wire’s spade connector end

to the amplifier’s REM (remote power)

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. No.

64-3057, not supplied).

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

connect this wire to a point in your vehicle’s fuse box 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 eyelet/spade terminal end to the amplifier’s two

GND terminals.

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 eyelet/spade terminal end to the amplifier’s two +12V

terminals.

7. Remove the nut from the positive (+)

cable’s terminal bolt, mount the red

wire’s 50A fused eyelet terminal on the

bolt, then replace and tighten 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 bolt or damage to your

vehicle’s wiring could result.

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

(illus - please add a

dwg that illustrates

step 7)

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dwg that illustrates

step 3)

12-1977.fm Page 7 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. No. 42-2368 (not supplied).

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.

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 CH1, front-right to CH2, rear-left to CH3, and rear-right

to CH4.:

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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:

• front-left to CH1 and front-right to CH2, or

• rear-left to CH3 and rear-right to CH4

12-1977.fm Page 9 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. No. 42-2368 (not supplied).

• Connect one of the Y-adapter’s double phono plug ends to the amplifier’s

CH1 phono jack.

• Connect the other double phono plug end to the amplifier’s CH3 phono

jack.

• Connect the single phono plug end to the autosound system’s left output

jack.

• Connect one of the other Y-adapter’s double phono plug ends to the

amplifier’s CH2 phono jack.

• Connect the other double phono plug end to the amplifier’s CH4 phono

jack.

• Connect the single phono plug end to the autosound system’s right out-

put jack.

12-1977.fm Page 10 Tuesday, July 13, 1999 10:07 AM

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