Carvin FET1000 Instruction Manual - Page 37

FET

Series

Power

Amplifiers

About

the

FET

Series

Amps

Section

3

Front

Panel

Features

Power

Switch:

Rocking

the

power

switch

"Up"

will

apply

power

to

the

FET

amp.

The

red

LED

power

"PWR"

indicator

light

will

illuminate

to

indicate

that

the

amplifier

is

powered.

The

turn

on

"mute"

circuitry

will

engage

immediately

upon

applying

power

to

your

unit.

This

will

delay

the

connection

to

the

speakers

by

approximately

three

seconds.

The

turn

on

delay

allows

the

amp

and

any

associated

gear

time

to

stabilize

before

the

amp

is

connected

to

the

speakers.

This

professional

feature

protects

the

speakers

from

any

high

level

transients

that

might

appear

at

the

amp's

input

due

to

"turn

on"

transients

in

equipment

feeding

the

amp.

CH

1

and

CH

2

Input

Level

Controls:

These

precision

(41

step)

input

level

attenuators

are

carefully

calibrated

to

allow

the

operator

to

adjust

the

sensitivity

of

the

power

amp

to

match

the

output

level

of

nearly

any

mixer

or

pre

-amp

.

These

controls

do

not

limit

the

amp's

output

power,

and

maximum

output

levels

can

be

achieved

at

any

setting

above

-10dB

(12

O'clock).

You

can

fmd

the

best

gain

control

setting

as

follows:

A.

For

normal

operation

set

the

FET

amplifier

level

controls

at

-10dB

(knob

marker

straight

up).

B.

Adjust

the

mixer

or

pre

-amp

output

gain

controls

to

set

the

desired

sound

level.

C.

If

you

wish

to

operate

the

mixer/pre-amp

at

a

higher

output

level,

then

reduce

the

settings

of

the

input

attenuators

a

few

dB

and

check

the

mixer/pre-amp

sound

level

again.

D.

If

you

wish

to

operate

the

mixer/pre-amp

at

a

lower

output

level,

then

increase

the

settings

of

the

input

attenuators

a

few

dB

and

check

the

mixer/pre-amp

sound

level

again.

Note:

If

distortion

should

occur

before

the

red

peak

indicators

light,

then

try

reducing

the

gain

of

the

mixer/pre-amp

and

increasing

the

input

level

setting

of

the

FET

amplifier

to

-10

dB

or

higher.

The

maximum

input

level

on

all

FET

models

is:

Balanced

+15

dBV

Unbalanced

+15

dBV

LED

Status

Indicators:

At

the

left

of

the

Input

Level

Attenuator

for

each

channel

are

a

pair

of

LED's

that

indicate

the

signal

status

of

the

channel.

The

green

"Signal"

LED

indicates

when

a

-30

dB

signal

is

present

at

the

output

(post

level).

The

red

"Clip"

LED

indicates

precisely

when

clipping

(distortion)

starts

to

occur.

These

indicators

monitor

the

circuits

of

the

amplifier

and

provide

an

accurate

indication

of

signal

presence

and

any

overloading.

If

the

red

clip

indicators

are

lighting,

you

should

turn

down

either

the

mixer/pre-amp

output

level,

or

the

input

level

at

the

amplifier

until

the

light

just

stops

flashing

(occasional

flashing

is

OK

as

low

level

clipping

distortion

is

rarely

audible).

The

clipping

indicators

feature

a

special

peak

hold

circuit

that

will

provide

a

bright

indication

for

even

momentary

clipping.

NOTE:

Continual

flashing

of

the

red

clip

indicators

will

not

damage

the

amp

but

may

be

harmful

to

the

speakers

because

of

the

excess

high

frequency

energy

generated

at

clipping.

3-4

Carvin FET1000 Instruction Manual - Page 37

Front, Panel, Features

Page 37 highlights