Lanzar Car Audio MAXP 2760 Manuel utilisateur

USER’S MANUAL

AMPLIFIERS:AMPLIFIERS:

R

:

::

:

RR

R

::

:

SS

S

S:

S

:

RS

R

S

R

MAXP 2760/MAXP 2960/MAXP 4260

TABLE

OF

CONTENTS

Contents and introdction -- -- - ---- -- - ---- -- - ---- --- ---- --- -- -- ---- - -- ---- --- ---

Page

1

Amplifier featuer descriptions -------- - ------ - ------ - ------- ------- -- -- --- -- -- -

_.

Page

2

MAXP2760/MAXP2960

channel amplifier applications- -- -- --- -- -- --- -- -- --- ---- - --

_.

Page

3

MAXP4260

channel amplifier applications-- --- ---- --- ------- ------- - ------ - ------ -

Page

4

MAXP4260

channel amplifier applications -- - -- ---- - -- ---- --- ---- --- ------- - ------ -

Page

5

MAXP4260

channel amplifier applications-- --- -- -- --- -- -- --- -- -- --- ---- - -- ---- - ---

Page

6

Setting

up

systems after installation for best performance -- -- ------- ------- - ------ -

_.

Page

7

Max pro series amplifier specifications --- - ------ - ------ ------- -------- ------- -- - --

Page

8

Troubleshooting ----- - ---- -- - ---- -- - ---- --- -- -- --- -- -- --- -- -- ------- ------- - --

Page

9

INTRODUCTION

Thank

you

for

purchasing

the

Lanzar MAXP

PRO

series amplifier.

Rest

assured

you

have purchased a

quality

product

designed

and

engineered 0 give

you

many

years

of

uncompromised

musical service.

The MAXP

PRO

series amplifier has been desigl"iled

using

the

latest

in

electronic

technology

available

today

This

mono

subwoofer amplifer

is

the result

of

adVanced

high

speed switching technology that overcomes the

less-efficient ciassA8 design.

Tliie MAXP

PRO

series amplifier reflects

your

true

appreciation

for

powerful

bass

reproduction

in

the

mobile

enviro ment.

This

amplifier

is

designed

for

10

-frequency

information

only

and

it

is

not

capable

of

reproducing

any

mid/high-frequency

information.

This

is

due

to

the noise intro'duced into the

filtered

out

of

the audio signal

-

AMPLIFIER

FEATUER

DESCRIPTIONS

~Z760fNU'XPZ960

Z

CHANNELAMPUFIERS

The

X..oVER

slide

switch

selects

the intermal

crossover

functions:

- The

input

signal

is

routed directiy

to

the

UNE

OUT

RCA

jacks. regardless

of

the

X-OVER setting simplifying daisy chaining

of

amplifiers.

• HP: Selects

the

built

in HIGH PASS filter. variable from

40

Hz

to

2KHz.

•

FlAT:

Bypasses all crossovers

for

full frequency range operation.

LP:

Selects

the

built

in

LOW

PASS filer. variable from 30 Hz

to

150Hz.

Note

that

the

LOW

PASS

signal

is

MONO

- In

the

LP

position.

the

HIGH PASS filter acts

as

a subsonic filter.

When

the

LP

mode

is

selected. a 0

to

+ I 0 dB.

at

45

Hz.

BASS

EO

is

also

switched

in.

The REMOTE

jack

enables dash

mount

level control

of

the

LOW

PASS

signal.

~4Z60

4

CHANNEL

AMPLIFIERS

The AMPLIFIER CH

I/ZCH

X-OVER slide switch selects

the

input

signal

for

channel pair

1&

2:

• HP: Selects

the

built

in HIGH PASS filter. variabe from 40 Hz

to

2KHz.

·

FULL:

Bypasses

all crossovers

for

full frequency range operation.

·

LP:

Selects

the

built

in

LOW

PASS filter. variabe from 30 Hz

to

150Hz.

Note

that

the

LOW

PASS

signal

is

MONO.

-In

the

LP

position.

the

HIGH PASS filter acts

as

a subsonic filter.

-

When

the

LP

mode

is

selected. a 0

to

+ I 0 dB.

at

45 Hz. BASS

EO

is

also

switched

in.

-

The AMPLIFIER CH

3/CH

4 X-OVER slide switch selects

the

input

signal

for

channel pair 3&4

• HP: Selects

the

built

in

HIGH PASS fiter. variable from 40 Hz

to

2KHz.

·

FULL:

Bypasses

all crossovers

for

full frequency range operation.

·

LP:

Selects

the

built

in

LOW

PASS filter. variabe from

30

Hz to 150Hz.

Note

that

the

LOW

PASS

signal

is

MONO.

-In

the

LP

position.

the

HIGH PASS filter acts

as

a subsonic filter.

-

When

the

LP

mode

is

selected. a 0

to

+ I 0 dB.

at

45 Hz. BASS

EO

is

also

switched

in.

-Full range signal from channels I I 2 inputs are routed

to

the

Une

OUT

RCA

jacks. regardless

of

the

setting

of

the

X-OVER switches.

-The

REMOTE

jack

enables dash

mount

level control

of

the

LOW

PASS

Signal.

CH3/40nly.

FEATURES

•

Bass

Boost

Circuit

• Variable

low

Pass

Crossover

• Anti-Thump Turn-On

• Tri-Mode Configurable

•

Soft Turn

On/Off

•

RCA

Une

Input

• Blue

light

Illuminated

lanzar

Logo

• Power Protection

LED

Indicators

• Advanced Protection Circuitry

•

Bass

Boost

Remote Control

•

THD:

<0.05%

• SIN Ratio: >95dB

• Frequency Response: 10Hz-40KHz

MAXP2760/MAXP2960

2

CHANNEL

AMPLIFIER

APPLICATIONS

FULL

RANGE

STEREO

This

;s

the

most

basic

application

for

the

MAX

PRO

Series

2

channel

amplifiers.

1.

Interconnect

cable

checklist:

Connect

the

UNE

INPUTS

to

the

Radio/CD

with

good

quality

RCA cables.

Z.

Crossover

Switch:

The

X-OVER

switch

must

be

in

the

FlAT

position.

3.

Crossover

frequency

control

checklist:

N/

A

for

full

range

operation.

4.Line level:

Refer

to

the

section "Setting

up

systems

after

installation

for

best

performance-

S.

Bass

Remote:

Plug

in

the

Bass

Remote

to

the

amplifier

-REMOTE-jack.

NOTE:

Minmum

tinalloudspeaker

impedances:

4 & Z

Ohms

stereo

mode

or

4-Ohms

mono

mode

This

amplifier

will

not

do

I

Ohm

stereo

or

Zli

Ohm

mono

operation.

FULL

RANGE

MONO

This application illustrate

the

basic

mono

bridging

method

fat

alllanzar

amplifiers.

Interconnect

cable

checklist:

A

MONO

signal

source

is

required.

such

as

would

be

available

from

the

mono

sub

bass

output

of

an

active

crossover,

whether

stand

alone.

or

built

into

a

head

unit

or

equalizer.

Important:

Do

not

be

tempted

to

connect

the

hot,

or positive outputs. from any source

together

to

obtain

a

mono

signal, as this CQuid

very

well

damage

the

output

stage

of

that

source.

It

is

necessary

to

feed

the

SAME signal

to

both

left

and

right

inputs

via a Y-adapter RCA cable.

Connect

the

mono

speaker positive

terminal

to

the

LEFT +,

and

its

negative

terminal

to

RIGHT-.

Switch

setting

checklist:

-The

AMPUFIER

X-OVER

switch

must

be

in

the

FUU

position.

Crossover

frequency

control

setting

checklist:

N/

A

for

full

range

operation.

np:

If

you

are

using

the

mono

sub

bass

output

of

an

active crossover,

there

isnothing

wrong

with

switching

in

the

low

pass

filter

in

these amplifiers

for

a steeper

low

pass rolloff.

Minimum

fin

••

loudspeaker

impedance:

-4

ohm

mono.

Q

FUIl.R.\NGE

STEREO

UNE

INPUT

VIA.

Y-I!.DAPTER

FROM

MONO

SOURC

Q

VQ

I

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ilSl

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n...=

-

FUll.

RANGE

SPEAKERS

ro

TO

BAITER'Y

+I2V

VIA

FUSE

REMOTE

TIJRN-ON

CHASSIS

GROUND

TO

FUllAANGE

ONOSPEAKER

M

BA

TTER'Y

+ I 2V

VIA

FUSE

OTE

TIJRN-ON

SIS

GROUND

REM

CHAS

MAXP4260

4

CHANNEL

AMPLIFIER

APPLICATIONS

4

CHANNEL

FULL

RANGE

SYS

TEM

Here

we

show

how

to

use

the

4 channel amplifiers

as

straightforward discrete 4 channel full range units.

Interconnect

c.ble

checldlst:

- Connect

the

four

inputs

of

the

amplifier to a Radio/CD

FUIl..RANGE co

with

quality

RCA

cables,

STERfOUNE '"

SWItch

.enlng

checklist:

-ljZCH

X'()VER:

FULL

-3/4CH

X'()VER:

FULL

Crossover

frequency

control

checklist:

Channel.

I/Z:

Channel.

3/4:

-HIGH PASS:

NfA

-HIGH PASS:

NfA

-LOW

PASS:

NfA

-LOW

PASS:

NfA

Level

control

checklist:

- Refer

to

the

section "setting

up

systems after installation for

best

performance"

Minimum

flnalloud

.......

ker

Impedance.:

..

Z

ohm

per

ch.nnel.

Z

or

3 CHANNEL FULL RANGE SYSTEM

Here

we

show

how

to

use

the

4 channel amplifiers

as

full range

2 or 3 channel units

by

taking advantage

of

the

mono

bridging

capability

of

alllanzar

MAX

PRO

series amplifiers.

The

follwing

example shows

how

to

create a 3 channel system

INPUTS

~

by

mono

bridging

channel pair

3/4.

In

order

to

create a 2 channel

system. simply

follow

the example

to

also

mono

bridge channel pair 1f2,

Interconnect

cable

checklist:

- Connect

the

inputs

of

channel pair

1/2

to

a suitable stereo source,

e.g. a head

unit

with

good

quality

RCA

cables.

-A

MONO

signal source

is

required

to

bridge channel pair3/4, such

as

would

be available from

the

mono

sub

bass

output

of

an

active

crossover,

whether

standalone,

or

built

into

a head

unit

or

equalizer.

Important:

Do

not

be

tempted

to

connect

the

hot.

or

positive

outputs, from

any

source

together

to

obtain

a

mono

signal,

as

this

could very well damage

the

outout

stage

of

that

source,

-

It

is

necessary

to

feed the

SAME

signal

to

both

lett and

right

inputs

via a Y-adapter

RCA

cable.

-

Connect

the

mono

speaker positive terminal

to

the

RIGHT +,

and

its negative terminal

to

LEFT

-

as

shown.

SWItch

.enlng

checklist:

-I/ZCH

X'()VER:

FULL

-3/4CH

X'()VER:

FULL

Cros.over

frequency

control

checkli.t:

chennel.

I/Z:

channel.

3/4:

- HIGH PASS:

NfA

_

HIGH

PASS:

NfA

-

LOW

PASS:

NfA

_

LOW

PASS:

NfA

-

1

STEREO

I MONO

FUll.

RANGE

UNE

INPI./n

='-

"~

~

j

FUll

RANGE

SPEMERS

I"

..

Ji

tO

"

~

'~.~"

~

f!

to

~

I~·

.2

L

P i

~

[1

D

to

~.

~

~COl~6(fJLrr

~

[:g

to

~I

~

I

TOBATTERY+I2V

VIII

FUSE

looJ

~

:.

REMOTE

TURN-ON

0

:Ii

~~I

CHI\S5IS

GROUND

I~

"

~

or

~

l

~

u

=-r

=

TIP:

If

you

are using

the

mono

sub bass

output

of

an

active crossover,

there

is

nothing

wrong

with

switching

in

the

low

pass filter

in

these amplifiers

for

a steeper

low

pass rolloff.

Level

control

checkli.t:

- Refer

to

the

section "Setting

up

systems after installation

for

best performance"

Minmum

final

loudspeaker

impedances:

-2

ohm

per

channel

in

stereo

mode.

-4

ohm

mono

bridged.

STEREO

!tj

FULL

AANGE

OR

HIGHS

•

SPENCERS

ffi

STEREO

FUll.

RANGE

+ ORHIGHS

SPEAKERS

TO

Bll.TTERY+1ZV

VIA

FUSE

REMOTE

TURN-ON

CHASSIS

GROUND

MAXP4260

4

CHANNEL

AMPLIFIER

APPLICATIONS

2

way

active,

or

b ....

mpllfted

system

with

mono

bass

This application shows

how

easily a 2 way active system can

be

implemented

using a

MAX

PRO

series 4 channel amplifier. Channels

I

and

2 will

be

used

for

highs,

and

channels 3

and

4

for

mono

bass.

Interconnect

cable

checklist:

-

We

need

to

feed

the

same signal

to

both

sets

of

channels, so

must

use 2 Y-adapters,

one

to

feed

the

LEFT

signal

to

channels

I

and

3,

and

the

right

signal

to

channels

2and

4,

as

shown.

Mono

bass

woofer

wiring

- Connect

the

mono

speaker positive terminal

to

the

RIGHT +,

and

its

negaitive terminal

to

LEFT

-.

Switch

setting

checklist:

• 1/2CH

X-oVER:

HP

•

3/4CH

X-oVER:

lP

Crossover

frequency

control

checklist:

channels

1/2

·HIGH PASS:

100

Hz

-LOW

PASS:

NfA

Channels

3/4:

• HIGH PASS

(subsonic!:

20

Hz

•

Low

PASS:

100

Hz

Please

note

that

these frequency points only. Refer

to

the

loudspeaker manufacturer specifications

and

the

section

"setting

up

system

after

installation

for

best performance-

2

way

active,

or

bl-ampllfted

system

with

mono

bass,

and

faded

highsj

10_

Here

we

present a variation

of

the

previous system. Since

this

is

a 2

way

system,

wecan

use

the

front

outputs

from

a head

unit

to

drive

the

highs,

and

the

rear

output

to

drive

the

bass

This

method

allows

the

listener

to

easily adjust

the

relative levels

of

bass

to

highs,

with

the

front

to

rear

fade

on

the

head unit. Channels 1

anf

2

will

be

used

for

highs,

and

channels 3

and

4

for

mono

bass.

interconnect

cable

checklist:

- Use

good

quality

RCA

leads

to

connect

the

inputs

of

the

amplifier

to

the

source

as

shown.

-

Follow

the

instructions

as

per

the

previous system

for

switch

and

crossover settings.

Level

control

checklist:

Refer

to

the

section "setting

up

systems

after

in

stall

ation

for

best performance"

Mlnmum

ftnalloudspeaker

Impedances:

·2

ohm

per

channel

in

stero

mode

·4

ohm

mono

bridged.

LEFT

TO

Cfi..\NNELS

I

AND

3

FU1J.RANGE

STEREOUNE

INPUTS

-

STEREO

~

FULLMNGE

OR

HIGHS

+

SPEAKERS

!O

STEREO

FUURANGE

+

OR

HIGHS

SPENCERS

~

MONO

f{tI

OR

SUB

s.\SS

SPENCERS

TO

M.

TTEIn'

+

12V

VIA

FUSE

REMOTE

TURN-ON

CH.\SSIS

GROUND

rn

STEREO

FUll.

RANGE

+

OR

HIGHS

SPENCERS

~STEREO

~FUURANGE

OR

HIGHS

r1\

SPENCERS

!iJ

MONO

OR

SUB

MSS

SPENCERS

MAXP42604

CHANNEL

AMPLIFIER

APPLICATIONS

Front/ear

high

pass,

using

a Z

channel

amplifier

for

mono

sub

bass

The

combination

of

a 2

and

a 4 channel amplifier, utilizing

their

built

in crossovers. makes

it

a snap

to

put

together a full system

with

front

and

rear highs.

with

mono

sub

bass.

Interconnect cable checklist:

- Using

good

quality

RCA

cables. feed

the

front

and

rear outputs

of

a head

unit

to

the

inputs

of

the

4 channel amplifier

as

shown.

-Also connect

the

LINE

OUT

of

the

4 channel amplifier

to

the

LINE

INPUT

of

the 2 channel amplifier

as

shown.

Mono

bass

woofer wiring:

Connect

the

mono

speaker positive terminal

to

the

LEFT

+,

and

its negative terminal

to

RIGHT

-.

Switch

.etting

checklist.

4

channel

high.

amplifier:

•

1/2CH

X'()VER:

HP

•

3/4CH

X-OVER:

HP

Z

channel

bilss

amplifier:

• X'()VER

switch:

LP

Crossover

frequency

control

checklist:

• 4

channel

high.

amplifier:

Channel.

1/2

• HIGH PASS:

100Hz

LOW

PASS:

NfA

Channel.

3/4

• HIGH PASS: 100Hz

LOW

PASS:

NjA

2

channel

bas.

amplifier:

• HIGH PASS

ISubsonlc

filter,:

10Hz

to

40Hz

Please

note

that

these frequency points are suggestions only.

Refer

to

the

loudspeaker manufacturer specifications and

the

section 'Setting

up

systems after installation

for

best

performance"

Level

control

checklist:

- Refter

to

the

section "Setting

up

systems after installation

for best performance-

Minimun

finalloud.peaker

impedances:

• Z

ohm

per

channel

in

.tereo

mode.

·4

ohm

mono

bridged.

-

FRONT

INPlm

REJlR

INPlm

""'0

INlERCONNECT

RCII,"""

(

:g

FUll

RIoNGE

SPEAKERS

TOBATTERY+I'lV

VIA

FUSE

-REMIOTE

TURN-ON

FULlRloNGE

MONO

SPEAKER

TOBATTERY+I'lV

VIA

FUSE

SETTING

UP

SYSTEMS AFTER INSTALLATION FOR BEST PERFORMANCE

General:

At

this

point you are ready to

get

more

specific

on the settings for your amplifier.

HIgh Pass:

-When

in

Hi

Pass

operation,

this

setting

acts

as

a

low

frequency cut off for your

system

reproduction. The point that you set it

at

cuts

off any frequencies from reproduction

beyond this point. The

12

o'clock position

is

a great starting point.

EXAMPLE:

If

you

adjust

the

High

Pass

to

100Hz.

the

amplifier

will

not

play trequencies

below

100Hz

but

will

play trequencies

trom

100Hz to

the

chosen

Low

Pass

trequency.

-When

in

Low

Pass/Bandpass

operation, this setting

acts

as

a

low

frequency cut off for your

system

reproduction aka

Subsonic

Filter. The point that you set it

at

cuts

off any

trequencies

trom

reproduction beyond this point. The

12

o'clock position

is

a great starting point.

EXAMPLE:

If

you

adjust

the

High

Pass

to

25Hz.

the

amplifier

will

not

play

trequencies

below

25Hz

but

will

play frequencies from 25Hz

to

the

chosen

Low

Pass

frequency.

-When

in

Flat/Full operation, the High

Pass

crossover

is

bypassed.

BassEQ:

This

setting

is

a

fIXed

bass

boost

at

45Hz that

is

variable from

0-1

OdB.

This

feature provides impact to your

bass,

but if

not

adjusted correctly. it can

be

over used and cause

damage to your

speakers

and amplifiers. It

is

best to slowly turn

this

setting clockwise until the desired punch

is

felt. it

is

not

recommended to exceed the 12 o'clock position

unless listening

at

a

low

volume

or

a

low

recording quali1y

as

this can result in

high

distortion

and

possibly clipping.

Low

Pass:

The Low

Pass

control

acts

as

a ceiling and doesn't allow frequencies to the right

of

the desired setting to be reproduced. Turning the potentiometer all the

way

to the right

is

a great starting point.

EXAMPLE:

If

you

adjust

the

Low

Pass

to

120Hz.

the

amplifier

will

not

play fTequencies above 120Hz

but

will

play frequencies from 120Hz

to

the

chosen Hi

Pass

or

Subsonic trequency.

-When

in

Hi

Pass

operation,

this

setting

is

bypassed.

Level Control Setup:

Ensuse

that the level

is

turned completely to the left prior to turning the syetem on. Next you should insert a CD or

cassette

that you are familiar with to

use

as

a reference,

and

turn

the

head

unit

volume

control

to

about

80%

of

its full setting. The system sound level

will

of

course be very low.

and

the

following

procedures

will

help

you

to match

the

amplifier

input

sensitivities properly to

the

head

unit

output

signal level.

It

is

important to match the amplifier

LEVEL

input sensitMty to the Radio/CD output

sensitivity.

This

can be located

in

the Radio/CD manual.

If

the

Radio/CD

output

sensitivi1y

is

2 volts.

then

adjust

the

amplifier LEVEL

input

to

2 volts.

If

you

are

not

sure

what

the

Radio

output

sensitivi1y

is.

follow

these general guide lines:

Turn the level control

up

SlOWly,

till you hear distortion, then back off a

few

degrrees on the control. If

at

any point your amplifier

goes

into protection, you will need to turn

the

level to the left a bit and then

try

again. If you reach a point where the output

does

not increase, stop turning the level control to the righe

as

the amplifier/speaker

combo

has

reached

its

maxx output

in

this

application.

Z

or:l

way

active

systems

lalll:

Always start

with

the

bass.

or

low

frequency amplifier

as

a reference.

by

turning

its control

up

to

the

point

where

distortion

is

audible.

and

back

it

olf

some.

Now

adjust

the

level control

for

the

highs

or

tweeter channels in a 2

way

active system. to balance

the

highs to lows.

In a 3

way

active

system,

match the midrange level to the

bass,

and then the highs to the midrange and

bass.

It may

be

necessary to perform a

few

iterations

of

the midrange

and highs

level control settings to achieve a satisfactory sound balance.

Sit bIIck

and

enjoy

the

music!

-

Lanzar

MAX

PRO

SERIES

AMPLIFIER

FEATURES

MODEL

MAXP2760

MAXP2960

MAXP4260

Out

Power

Rating

RMSat40hms

500Wx2 750Wx2 250Wx4

MAX

at

4 Ohms 1000Wx2 1500Wx2 500Wx4

MAX

at

4 Ohms Bridced

1200Wxl

3000Wxl

1000Wx2

RMSat 2 Ohms

BOOWx2

1200Wx2 400Wx4

Miscellaneous

Spec

Soft Start Sound

Yes Yes Yes

Frequency Response -3dB

10Hz-40KHz

10Hz-40KHz 10Hz-40KHz

Dampinc

Factor >200 >200 >200

SIN

Ratio(A-Weight)

> 95dB

> 95dB > 95dB

THD

& Noise

<0.05% <0.05% <0.05%

Channel Separation

at

I

KHz

>70dB >70dB >70dB

Varible

Input

Level Control 0.2V-6.0V 0.2V-6.0V 0.2V-6.0V

Input

Impedance

20kQ

20kQ 20kQ

Power and Diagnostic

LED

Power/Protect Power/Protect Power/Protect

Protection(DC,

Short, Thermal, Overload)

Yes Yes Yes

Power Supply. all

MOSFET

PWM

Yes

Yes Yes

MOSFET Outputs

Yes Yes Yes

Crossover

and

Swlthchlng

Input

Selector

Switch

Crossover SfW for I

+Z

channel

Hp/FULljLP-BP

Hp/FULljLP-BP Hp/FULljLP-BP

Variable Hi-pass / Subsonic Filter

40Hz- 2kHz 40Hz- 2kHz 40Hz- 2kHz

Variable Low-pass

(Mono

24dB)

30Hz- 150Hz 30Hz- 150Hz 30Hz- 150Hz

Bass

Boost

at

45Hz

0-

10dB

0-

10dB

0-

10dB

Crossover SfW for

3+4

channel

Variable Hi-pass

40Hz- 2kHz 40Hz- 2kHz 40Hz- 2kHz

Variable

Low-pass/

(Mono

24dB)

30Hz- 150Hz 30Hz- 150Hz 30Hz- 150Hz

Bass

Boost

at

45Hz

0-

10dB

0-

10dB

0-

10dB

UneOutput

Full Rance Full Rance Full Rance

Unbalanced

InputlRCAJackJ

Yes Yes Yes

Remote

Control

Yes Yes Yes

Power Terminal

4-GA 4-GA 4-GA

Speaker Terminal

8-GA 8-GA 8-GA

Fuse

Size

20Ax3 30Ax3 40Ax2

Dimensions

(W

x H x

L)

Inches

10.

I 6-x2.56-xl 3.86-

10.

16-x2.56-xl 5.83-

10.

16-x2.56-xl 2.8-

Note:

Features

subject

to

change

without

notice

-

TROUBLESHOOTING

Before

removing

your

amplifier,

refer

to

the

list

below

and

follow

the

suggested

procedures.

Always

test

the

speakers

and

their

wires

first.

AMPLIFIER

WILL

NOT

POWER

UP.

Check for

good

ground

connection.

Check

that

remote

DC

terminal has

at

least 13.8v

DC.

Check

that

there

is

battery

power

on

the

+terminal.

Check all

fuses.

Check

that

Protection

LED

is

not

lit

If

it

is

lit. shut

off

amplifier briefly and

then

repower it.

HIGH

HISS

OR

ENGINE

NOISE

(ALTERNATOR

WHINEI

IN

SPEAKERS.

Disconnect

all

RCA

inputs to the amplifierlsj-if hiss/noise disappea,,- then plug in the component

drMng

the amplifier and unplug

its

inputs.

If

hiss

/ noise

disappea,,-

go

on

until the faulty/noisy component

is

found.

It

is

best

to

set

the

amplifier's

input

level

as

insensitive

as

possible. The best

suQjective

SIN

ratio

is

obtainable

this

way.

Try

to drive

as

high a

signal

level

from

the head unit

as

possible.

PROTECTION

LED

COMES

ON

W

EN

THE

AMPLIFIER

IS

POWERED

UP.

Check for shorts

on

speaker leads.

Check that

the

volume control

on

th head unit

is

turne(j

down

low.

Remove speaker leads.

and

reset

the

a plifier.

If

the

Protection

LED still

comes

on.

then

the

amplifier

is

faulty.

AMPLIFIER(SI

GETS

VERY

HOT.

Check

that

the

minimum spe7

er

im edance

for

that

model

is

correct.

Check for speaker shorts.

Check

that there

is

good airftow a

r:

ound the

amplifier.

In

some

applications,

an

external

cooling

fan

may

be

required.

DISTORTED

SOUND

Check

that

the

Level controlls)

is

set to match

the

signal"level

of

t '

he

ad unlu

'-

Check that

all

crossover

Check for shorts

on

the

sP!'aker leads.

-

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