Lightning Audio L-2125 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

6

Andere Lightning Audio Verstärker Handbücher

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INTRODUCTION

Dear

Customer,

Congratulations

on

your

purchase.

At

Lightning

Audio

we

are

pleased

that

you

chose

our

product.

For

maximum

performance

we

recommend

you

have

your

new

Lightning

Audio

product

installed

by

an

Authorized

Lightning

Audio

Dealer.

Please

read

your

warranty

and

retain

your

receipt

and

original

carton

for

possible

future

use.

Visit

our

web

site

for

the

latest

information

on

all

Lightning

Audio

products;

www.lightningaudio.com

or,

in

the

U.S.

call1-888-881-8186

or

FAX

1-800-398-3985

Table

of

Content

2

Introduction

3

Specifications

4-5

Design

Features

6-15

Installation

Installation

Considerations

Mounting

Locations

Battery

and

Charging

Wiring

the

System

16

Operation

Adjusting

Level

Adjusting

Crossover

Frequency

Variable

Phase

Bass

Boost

(Variable

&

Selectable)

Remote

Level

Control

17

Troubleshooting

18-23

Additional

Languages

French

Spanish

German

Italian

24

Limited

Warranty

Information

If,

after

reading

your

manual,

you

still

have

questions

regarding

this

product,

we

recommend

that

you

see

your

Lightning

Audio

dealer.

If

you

need

further

assistance

,

you

can

call

us

direct

at

1-800-669-9899.

Be

sure

to

have

your

serial

number,

model

number

and

date

of

purchase

available

when

you

call.

Safety

This

symbol

with

"WARNING"

is

intended

to

A\

alert

the

user

to

the

presence

of

important

in-

L.1.1

WARNING

structions.

Failure

to

heed

the

instructions

will

result

in

severe

injury

or

death.

ihCAUTION

This

symbol

with

"CAUTION"

is

intended

to

alert

the

user

to

the

presence

of

important

in-

structions

.

Failure

to

heed

the

instructions

can

result

in

injury

or

unit

damage.

•

To

prevent

injury

and

damage

to

the

unit,

please

read

and

follow

the

instructions

in

this

manual.

We

want

you

to

enjoy

this

system

,

not

get

a

headache

.

•

If

you

feel

unsure

about

installing

this

system

yourself

,

have

it

installed

by

a

qualified

Lightning

Audio

technician.

•

Before

installation

,

disconnect

the

battery

negative

(-)

terminal

to

prevent

damage

to

the

unit

,

fire

and/or

possible

injury.

©2013

Rockford

Corporation

.

All

Rights

Reserved.

Lightning

Audio

and

associated

logos

where

applicable

are

registered

trademarks

of

Rockford

Corpora-

tion

in

the

United

States

and/or

other

countries

.

All

other

trademarks

are

the

property

of

their

respective

owne

rs.

Specifications

subject

to

change

without

notice.

2

SPECIFICATIONS

L·21

25

L-4300 L-4600 L-5600

L ·

1250

L·1

5000

L-11

0000

Rated

Power

-

40x2

@4

ohms

50

x4

@4

ohms

100x4@

4

ohms

50x4

@4

ohms

150x

1@4

ohms

125x1

@4

ohms

250x1

@4

ohms

Continuous

Power

65x2@

2

ohms

75x4@

2

ohms

150x4

@2

ohms

75x4

@2

ohms

250x

1@2

ohms

250x1

@2

ohms

500

x1@2

ohms

Rating

(RMS)

Measured

125x1

@4

ohms•

150x2

@4

ohms·

300x2@

4

ohms•

150x2@

4

ohms•

500x

1@

1

ohm

1000x1

@

1

ohm

@

14.4V

Sub:

200

x1@4

ohms

S

ub

:

300x1

@2

ohms

Crossover

Slope

12dB/Oct

12

dB/Oct

12

dB

/

Oct

12

dB

/

Oct

12

dB

/

Oct

12

dB

/

Oct

12dB

/

Oct

Crossover

Frequency

Variable

50Hz-250Hz

Variable

50Hz-250Hz

Variable

50Hz-250Hz

Variable

50Hz-250Hz

Variable

50Hz

-

250Hz

Variable

50Hz·250Hz

Variable

50Hz-250Hz

SS

:

28Hz

Fixed

25Hz

HP

Fi

x

ed

25Hz

HP

Fixed

25H

z

HP

Bass

Boost

Selectable

Selectable Selectable

Variable

0·'

12dB

Va

ri

able

0-•

12dB

Var

i

able

0··

12dB

Variable

0-•

12dB

0

/'

6dB

/•

12dB

@

45Hz

0/•6dB

/'

12dB

@

45Hz

0

/'

6dB

/

•12dB

@

45Hz

@

45Hz

@

45Hz

@

45Hz

@

45Hz

Operating

Voltage

9-16VDC

9-16VDC

9-16VDC

9·

16VDC

9-16VDC

9-16VDC 9-16VDC

Frequency

Response

20Hz-20kHz

20

H

z-20k

Hz

20Hz-20k

Hz

20Hz-20kHz

25

Hz-250H

z

25Hz-250

Hz

25

H

z-250Hz

Sub

:

25Hz-250Hz

Batte(r

Fuse

Rating

25A

50

A

90A

70A

30A

50

A

90A

not

supplied)

THD+N

@

Rated

Power

<1

.0%@

4

ohms

<1.

0%

@4o

hm

s

<1

.

0%

@4

ohms

F/R: <1.0%@4

ohms

<1

.

0%

@4

ohms

<1.

0%

@4

ohms

<1.

0%

@2

ohms

<1.0%@2o

hms

<1

.

0%

@2o

hm

s <1.

0%

@4

ohms

<1.0%@2

ohms

<

1.0

%@

2

ohms

<1.

0%

@2

oh

ms

<1.0%@2

ohms

<1.

0%

@1

ohm

<1.0

%@

1

ohm

S

ub

:

<1.

0%

@4

ohms

<1.

0%

@2

ohms

Input

Sensitivity

1

50mV-4V

Low

L

evel

150mV-4V

Low

L

ev

el

150mV

-

4V

Low

Level

150mV-4V

Low

Level

150mV

-4V

Low

Level

150mV-4V

Low

Level

15

0

mV-4V

Low

Level

300mV-8V

Hi

gh

Level

300mV-8V

High

L

eve

l

300mV

-

8V

H

ig

h

Le

ve

l

300mV-8V

High

Leve

l

300mV-8V

High

Level

300mV-8V

Hi

gh

Level

300mV-8V

High

Le

ve

l

Input

Impedance

20k 20k 20k 20k

20k

20k 20k

SIN

Ratio

CEA

2006

>8

0dB

>

80dB

>

BOdB

F/R:>

BOdB

>BO

dB

>

BOdB

>

BOdB

Sub

:>

BOdB

SIN

Ratio

@

Rated

>

100dB

>

100dB

>

100dB

F/

R:>

100dB

>

100dB

>

100dB

>

10

0

dB

Power

S

ub

:

>1

00dB

Channel

Separation

>50d

B >

50dB

>

50dB

>

50dB

N/A N/A N/A

Common

Mode

Rejec

-

lion

Ratio

>40dB

>

40dB

>40dB

>

40dB

>40dB >40dB

>40dB

Damping

Factor

>

200

>

200

>2

00

F/R

:

>2

00

>200

>

200

>200

S

ub

:>

200

Dimensions

(LxWxH)

7.9"

x7

.6"x2.3"

17

.

4"

x7.6" x2.3"

17.4

"x

7.6"x2.

3"

17

.4"x7.6"x2.3" 11.8"

X

7.6

"

X

2.3"

7.

9"x7.6"

x2.3

"

11.B

"x7.6"

x2

.

3"

(20cm

x1

9.4em

x5.8

em)

(4

4

.1em

x

19.4em

x

(4

4.1em

x

19

.

4em

x

(4

4.1em x

19.4em

x

(30cm

x19.

4em

x

5.8

em)

(20cm

x

19

.

4em

x

5.8

em)

(30cm

x

19

.

4em

x

5.8

em)

5.8

em)

5.8em) 5.8

em)

*

Rated

power

when

amplifier

is

wired

in

a

bridged

configuration.

CEA

2006

Power

rat1ngs

onl

'Qtllnin~

Audio

arnplil1ers

conform

tc

CfA-2006

industry

standards.

These

guidelines

mean

your

amplifier's

output

power

ratings

are

REAL

POWER

11umbers

not

inflated

marketing

rat

ings.

3

DESIGN

FEATURES

level

Control

The

level

control

is

used

to

match

the

output

of

the

audio

source.

High

level

Inputs

-

Optional

Inputs

Accepts

High

Leve

l

speaker

signal

when

ut

ilizing

the

harness

provided.

RCA

Input/Pass-

Thru

Jacks

The

RCA

Inputs/Pa

ss-

Thru

Jacks

are

nickel

-plated

to

resist

the

signal

degradation

caused

by

corrosion

.

The

Pass-

Thru

provides

a

convenient

source

for

daisy-

chaining

an

additional

amplifier

without

running

an

ex

tra

set

of

RCA

cables

from

th

e

front

of

the

vehi

c

le

to

the

rear

amplifier

loc

a

tion

.

Power/REM

Terminals

T

he

Power

and

G

round

Termina

ls

are

nickel

-

plat

-

ed

set

-

scre

w

wir

e

connectors

and

will

accommo

-

dat

e4

AWG

.

The

REM

Te

rmin

al isa

ni

c

kel

-

plat

ed

se

t-

screw

wir

e

connector

and

will

acco

mmodate

8AWG.

HIGH

LE\

LINPUT

FR

NT

r-

INPUT

---,

+ _ + _

!-£'

E';

-

~

@)

®)

:ll::::

'

~~~.:.

---ti-----ff--

0 0

LEVEL

© m

@)

@) @)

.[~d~.;,

4

b;:;;;;;~=h&.

FRONT

REAR

SUB

+_ +_

CLlJ

11?'='---------=---=----

1 I

Speaker

Terminals

The

Speaker

Terminals

are

nick

el

-p

l

ated

set-screw

wir

e

co

nn

e

ctor

s(+

and

-)

will

accommodate

8

AWG.

Crossover

Switch

Selectable

switch

for

Low-Pass

(LP)

or

All

Pass

(AP)

or

High-Pass

(HP)

DESIGN

FEATURES

Variable

Crossover

A

built

-

in

12dB/octave

Butterworth

filter

with

a

crossover

point

variable

from

50Hz

to

250Hz

_

(L

-

1250

, L

-15000

&

L

-11

OOOD

have

an

additional

25Hz

fi

xed

subsonic

filter

at

24/dB)

HP-AP-LP

FRONT

FREQ

.

=-

[IJ

1

100~175

•

LP

REAR

REQ

.

100. .175

75.

•

225

75·~·225

•

50

iso

MIN

M.u

50

iso

SUBFREQ.

PHASE

100

~175

o•

tao•

·~·

50

i5o

BASS

BOOST

REMOTE

LEVEL

POWER

0----~~~~----------

0

PROTECT

Remote

level

Control

Remotely

control

the

subwoofer

output

level

of

the

amplifier

.

Bass

Boost

Power/Protect

LED

Power

LED

illuminates

green

when

the

uni

t

is

turned

on

_

ProtecV

Thermal

LED

illuminates

red

when

amplifier

overheats

or

short

circu

i

ts

.

The

amplifier

will

automatically

shut

down

if

this

occurs.

Thi

s

va

r

iable

control

works

along

with

the

cross

o

ver

swit

ch

on

the

ampli

f

ier

,

boosting

the

bass

f

re

quencies.

Variable

Phase

T

he

variable

0-

180

.

pha

sec

ontrol

allows

the

list

ener

to

c

hange

the

a

rriv

al

tim

e

of

th

e

subwoof

er s

ound

wav

es

re

la

tiv

eto

th

e

sa

mefre

qu

en

cies

f

rom

thema

in

sp

ea

kers.

illus

.-

1.1

s

INSTALLATION

Contents

•

Lightning

Audio

Amplifier

•

Remote

Level

Control

(L-5600,

L-1250

,

L-15000&

L-110000)

Installation

Considerations

•

High

Level

Input

Connector

•

Installation

&

Operation

Manual

The

following

is

a

list

of

tools

needed

for

installation:

•

Fuse-holder

and

fuse

.

(See

•

Hand

held

drill

w/assorted

bits

specifications

for

fuse

rating)

•

Volt/Ohm

Meter

•

Wire

strippers

•

Wire

crimpers

•

Wire

cutters

•

#2

Phillips

screwdriver

•

Battery

post

wr

enc

h

•

Assorted

connectors

•

Adequate

Length-Red

PowerWire

•

Adequate

Length-Remote

Turn-on

Wire

•

Adequate

Length-Black

GroundingWire

This

section

focuse

s

on

some

of

the

vehi

c

le

conside

ration

s

for

i

nstall-

ing

your

new

amplifier.

Pre

-

planning

your

s

ystem

layout

and

best

wir

i

ng

routes

will

save

installation

time.

When

deciding

on

the

layout

of

your

new

system,

be

sure

that

each

component

will

be

easily

accessible

for

making

adjustments.

.&,.

CAUTION

Before

installation,

disconnect

the

battery

neg-

ative

(-

)terminal

to

prevent

damage

to

the

unit

,

fire

and/or

possible

injury

.

.&,_

CAUTION

Before

beginning

an

y

installation,

follow

these

s

impl

e

rules:

1.

Be

sure

to

carefully

read

and

understand

th

e

in

s

truction

s

before

attempti

ng

to

in

stal

l

th

e

unit.

2.

For

safet

y,

disconnect

the

negative

lead

from

the

battery

prior

to

beginning

the

installation.

3.

For

easie

r

assemb

ly

,

we

suggest

you

run

all

wir

es

prior

to

mounting

your

unit

in

place

.

4.

Route

a

ll

of

the

RCA

cables

c

lo

se

together

and

away

from

an

y

high

cu

rr

ent

wir

es

.

5.

U

se

high

quality

connec

tor

s

for

ar

eliable

installation

and

to

minimize

si

gna

l

or

power

l

os

s.

6

6.

Think

before

you

drill!

Be

careful

not

to

cut

or

drill

i

nto

gas

tanks,

fuel

lines,

brake

or

hydraulic

lines

,

vacuum

lines

or

electrical

wiring

when

working

on

any

vehicle.

7.

Never

run

wires

underneath

the

vehicle.

Running

the

wires

i

ns

ide

the

vehicle

provides

the

best

protect

i

on.

8.

Avoid

running

wires

over

or

through

s

harp

edges.

Use

rubber

or

plastic

grommets

to

protec

t

any

wires

routed

through

metal,

especially

t

he

firewall.

9.

ALWAYS

protect

the

battery

and

electrica

l

system

from

damage

with

proper

fusing

.

Instal

l

the

appropriate

fuse

holder

and

fuse

on

the+

12V

power

wire

within

18

"

(45.7

em)

of

the

b

atter

y

te

rm

inal.

10.

When

grounding

to

the

chassis

of

the

vehicle

,

scrape

a

ll

paint

from

the

metal

to

ensure

a

good

,

clean

ground

connection.

Grounding

connections

should

be

as

short

as

possible

and

always

be

connected

to

metal

that

is

welded

to

the

main

body

,

or

chassis,

of

the

veh

i

cle.

Seatbelt

bolts

should

never

be

used

for

connecting

to

ground.

Mounting

Locations

To

ensure

optimal

performance

,

mount

the

amplifier

with

at

least

1"

(2.54cm)

of

air

gap

around

the

amplifier's

heat

sink

to

provide

proper

cooling.

Trunk

Mounting

Mounting

the

amplifier

v

ertica

lly

or

inver

t

ed

will

provide

adequate

cool-

ing

of

the

amplifier.

Mounting

the

amplifier

on

the

floor

of

the

trunk

w

il

l

provide

the

best

cooling

of

the

amplifier.

Passenger

Compartment

Mounting

Mounting

the

amplifier

in

the

passenger

compartment

will

work

as

long

as

you

provide

as

uffi

c

ie

nt

amount

of

air

for

the

amp

li

fier

to

coo

l

itse

l

f.

If

you

are

going

to

mount

the

amplifier

under

the

seat

of

thev

ehic

l

e,

yo

u

must

have

at

le

ast

1"

(2

.

54cm)

of

air

gap

around

the

amplifier's

heats

ink

.

,r....

CAUTION N

ever

mountth

is

unit

i

~

t~e

eng

i

ne

_

compar

t-

~

ment.

Mountmg

the

un1t

m

the

eng

1n

e

com

-

partment

will

void

your

war

r

anty.

Battery

and

Charging

Amplifi

ers

will

put

an

increased

l

oad

on

the

ve

hi

cl

e's

battery

and

charging

system.

We

recommend

checking

your

al

ternator

and

battery

cond

i

tion

to

ensure

that

the

electrical

system

has

enough

capacity

to

handle

the

increased

load

of

your

stereo

system.

Stock

electrica

l

systems,

whi

ch

are

in

good

condition,

should

be

ab

le

to

handle

the

extra

load

of

any

Lighting

Audio

Series

amp

lifi

er

without

problems,

a

lthough

battery

and

alt

e

rnator

life

can

be

reduced

slight

ly

.

To

maximi

ze

the

pe

r

formance

of

your

ampli

-

fier,

we

suggest

the

use

of

a

hea

vy

duty

battery

a

nd

an

energy

sto

r

ag

e

capac

it

or.

Wiring

the

System

6CAUTION

If

you

do

not

feel

comfortable

with

wiring

your

new

unit,

please

see

your

local

Authorized

Lightning

Audio

Dealer

for

installation.

6 CAUTION

Before

installation,

disconnect

the

battery

neg-

ative(-)

terminal

to

prevent

damage

to

the

unit,

fire

and/or

possible

injury.

6CAUTION

Avoid

running

power

wires

near

the

low

level

input

cables

,

antenna

,

power

leads,

sensitive

equipment

or

harnesses

.

The

power

wires

car-

ry

substantial

current

and

could

induce

noise

into

the

audio

system.

1.

Plan

the

wire

routing.

Keep

RCA

cables

close

together

but

isolated

from

the

amp

I

ifier

's

power

cables

and

any

high

power

auto

accessories,

especially

electric

motors

.

This

is

done

to

prevent

coupling

the

noise

from

radiated

electrical

fields

into

the

audio

signal.

When

feeding

the

wires

through

the

firewall

or

any

metal

barrier,

protect

them

with

plastic

or

rubber

grommets

to

prevent

short

circuits

.

Leave

the

wires

long

at

this

point

to

adjust

for

a

precise

fit

at

a

later

time.

2.

Prepare

the

RED

wire

(power

cable)

for

attachment

to

the

amplifier

by

stripping

1/2"

of

insulation

from

the

end

of

the

wire.

Insert

the

bared

wire

into

the

B+

terminal

and

tighten

the

set

screw

to

secure

the

cable

in

place.

NOTE:

The

B+

cable

MUST

be

fused

18"

or

less

from

the

vehicle's

battery.

Install

the

fuseholder

under

the

hood

and

ensure

connections

are

water

tight.

3.

Trim

the

RED

wire

(power

cable)

within

18"

of

the

battery

and

splice

in

a

inline

fuse

holder

(not

supplied).

See

Specifications

for

the

rating

of

the

fuse

to

be

used.

DO

NOT

install

the

fuse

at

this

time.

4.

Strip

1/2"

from

the

battery

end

of

the

power

cable

and

crimp

an

appropriate

size

ri

ng

terminal

to

the

cable

.

Use

the

ring

terminal

to

connect

to

the

battery

positive

terminal.

5.

Prepare

the

BLACK

wire

(Ground

cable)

for

attachment

to

the

amplifier

by

s

tripping

1/

2"

of

in

s

ulation

from

the

end

of

the

wire.

Insert

the

bare

wire

into

the

GROUND

terminal

and

tighten

the

set

screw

to

secure

the

cable

in

place

.

Prepare

the

chassis

ground

by

scraping

any

paint

from

the

metal

surface

and

thoroughly

clean

the

area

of

all

dirt

and

grease

.

Strip

the

other

end

of

the

wire

and

attach

a

ring

connector.

Fasten

the

cable

to

the

chassis

using

a

non

-

anodized

screw

and

a

star

washer.

NOTE

:

Keep

the

length

of

the

BLACK

wire

(Ground)

as

short

as

possible

.

Always

less

than

30".

7

INSTALLATION

6.

Prepare

the

Remote

turn-on

wire

for

attachment

to

the

amplifier

by

stripping

1/2"

of

insulation

from

the

end

of

the

wire

.

Insert

the

bared

wire

into

the

REMOTE

terminal

and

tighten

the

set

screw

to

secure

the

wire

in

place.

Connect

the

other

end

of

the

Remote

wire

to

a

switched

12

volt

positive

source

.

The

switched

voltage

is

usually

taken

from

the

source

unit's

remote

amp

on

lead.lf

the

source

unit

does

not

have

this

output

available,

the

recommended

solution

is

to

wire

a

mechanical

switch

in

line

with

a

12

volt

source

to

activate

the

amplifier.

7.

Securely

mount

the

amplifier

to

the

vehicle

or

amp

rack

.

Be

careful

not

to

mount

the

amplifier

on

cardboard

or

plastic

panels

.

Doing

so

may

enable

the

screws

to

pull

out

from

the

panel

due

to

road

vibration

or

sudden

vehicle

stops.

8.

Connect

from

source

signal

by

plugging

the

RCA

cables

into

the

input

jacks

at

the

amplifier.

NOTE:

All

"ACTIVE"

inputs

must

have

RCA

jacks

connected.

When

con-

necting

to

the

5-Channel

inputs,

be

sure

to

route

front

,

rear

and

sub

RCA

cables

tightly

together.

Lt._

CAUTION

Always

ensure

power

is

off

or

disconnected

at

the

amplifier

before

connecting

RCA

cables

.

Failure

to

do

so

may

cause

damage

to

the

am-

plifier

and/or

connected

components.

Note:

When

the

installation

requires

a

High

Level

(Speaker)

input,

use

the

included

connector

to

tie

into

your

vehicles

speaker

wiring

.

9.

Connect

the

speakers.

Strip

the

speaker

wires

1/2"

and

insert

into

the

speaker

terminal

and

tighten

the

set

screw

to

secure

into

place

.

Be

sure

to

maintain

proper

speaker

polarity

.

DO

NOT

chassis

ground

any

of

the

speaker

leads

as

unstable

operation

may

result.

10.

Perform

a

final

check

of

the

completed

system

wiring

to

ensure

that

all

·

connections

are

accurate.

Check

all

power

and

ground

connections

for

frayed

wires

and

loose

connections

which

could

cause

problems.

Install

inline

fuse

near

battery

connection.

NOTE:

Follow

the

diagrams

for

proper

signal

polarity.

Lt._

CAUTION

This

amplifier

is

not

recommended

for

im-

pedance

loads

below

2-0hm

stereo/4-0hm

bridged

for

the

front/rear

channels

and

2-ohm

for

the

sub

channel.

Models

L-

1500D

and

L-

11

OOOD

are

not

recommended

for

impedance

loads

below

1-

0hm.

INSTALLATION

2-Channel [Stereo)

L-2125

Source Unit

PASS-THRU

Connects

to

inputs

of

2nd Amplifier

•Installation

optio

n

fo

r

multi

-

amp

install

---------~-

-

-,

L--------=:D·--

--

--

---

~-

I

Switched 12V

to

REM

Connect

to

chassis

ground

of vehicle

*Keep grounds as short

as

possible

Less than 18"

+

L·2125

PDS

NEG

ill

us

.-

2.1

jJ

20min

.

'lleep grounds as short

as possible

20min.

a

Amplifier

...

.

ffi

n

·0·m

M m

2-

Channel

[Mono)

L-2125

Source

Unit

PASS-THRU

Connects

to

inputs

of

2nd

Amplifier

"Installa

tio

n o

ption

for

multi

-

amp

Install

,.,

~------.I

I

---------~---1

L------rnm::::::D.---------

~-

I

Switched 12V

to

REM

Connect to

chassis

ground of vehicle

'

Keep

grounds

as

short

as

possible

Less than 1

8'

+

PDS

NEG

40min

.

'Keep grounds

as

short

as

possible

9

I ·

I

INSTALLATION

Amplifier

11l

us

.-2

.2

INSTALLATION

4-

Channel

[Stereo)

L-4300 and L-4600

Source

Unit

_

__,r>-._

-- - -- --- -- --

~

------- - ---'

~

'.

I

I

Switched 12V

to

REM

Connect to

chassis

ground

of

vehicle

'Keep

~rounds

as

short

as

possible

Less than 18"

illu

s.

-2.3

20min

.

20min

.

'Keep

~rounds

as

short

as po

ssi

ble

20min

.

20min

.

10

Amplifier

':"":'it

...

(2)

.

...

H

i~

--

n·0·m

H i)l