Fender SRA 400 Administrator Guide

(Professional

Sound

Reinforcement

Amplifier)

OPERATION

INSTRUCTION

MANUAL

NO.

017386

1979

CBS

MUSICAL

INSTRUMENTS.

DIVISION

CBS

INC.

LtTHO

U.S.A.

SRA

400

STEREO

POWER

AMPLIFIER

OPERATION

INSTRUCTION

MANUAL

PHYSICAL

DIMENSIONS

(APPROXIMATE,

FOR

SHIPPING

PURPOSES)

Weight

Width

Depth

Height

U.S.

System

pounds

inches

17.3

inches

5.25

inches

Metric

System

19.5

48.3

44.0

13.3

P.O.

BOX

4137

•

1300

EAST

VALENCIA

DRIVE,

FULLERTON,

CALIFORNIA

92634

NOTE:

See

accompanying

limited

warranty

folder.

TABLE

CONTENTS

PAGE

Introduction

.iv

SECTION

SRA

400

FRONT

PANEL

Input

Attenuators

Circuit

Breaker/Power

Switch

Power

Output

Displays

SRA

400

REAR

PANEL

Channel

Input

Channel

Input

Channel

Output

Channel

Output

Channel

Output

Fuse

Channel

Output

Fuse

Mode

Switch

Fan

PAGE

SECTION

SETTING

THE

SYSTEM

Sound

System

Connections

Rack

Mounting

Instructions

Speaker

Connection

Stereo

Program

Connection

Monophonic

Connection

Monophonic/Monitor

Connection

Stereo

Bi-amplified

Connections

Monophonic

Bi-amplified

Connection

Bridged

Output

Connection

SECTION

III

Sound

System

Connections

.5-

Preliminary

Operating

Sequence

SRA

400

General

Specifications

LIST

FIGURES

FIGURE

DESCRIPTION

PAGE

Front

Panel

Functions

Rear

Panel

Connections

Typical

Stereo

Program

Connection

Two

Channel

Output

from

Single

Source

(Mono)

Monophonic

Program/Monitor

Connection

Stereo

Bi-amplified

connection,

Stereo

Bi-amplified

Connection,

Monophonic

Bi-amplified

Connection

Bridged

Output

Connection

iii

INTRODUCTION

The

Fender

SRA

400

200

watts

per

channel

solid

state

stereo

power

amplifier

designed

for

sound

reinforcement

application.

designed

for

standard

19"

rack

mounting,

and

ruggedly

constructed

withstand

the

physical

abuse

encountered

road

travel.

Aten

segment,

fast

acting

LED

bar

graph

display

indicates

output

power

delivered

the

load

for

each

channel.

The

SRA

400

incorporates

detented

input

attenuators

with

steps,

calibrated

indicate

amplifier

gain

dBV.

These

input

attenuators

allow

for

predictable

and

repeatable

set-ups,

accurate

input

sensitivity

adjustments,

and

precise

channel

tracking.

Each

channel

employs

fully

complementary

circuitry

throughout.

Sixteen

250

watt

power

transistors

are

mounted

massive

tunnel

heatsink

with

over

6000

square

centimeters

cooling

surface.

two

speed

thermally

switched

fan

forces

air

from

the

rear

the

unit

through

the

tunnel,

and

out

the

front

panel.

mode

switch

allows

the

operator

easily

select

stereo,

mono,

bridged

modes

operation.

The

SRA

400

features

protective

circuitry

such

fast

action

speaker

fuses,

power

supply

fuses,

primary

electromagnetic

circuit

breaker,

over-

temperature

sensing,

and

output

transistor

commutating

diodes,

making

practically

abuse

proof.

The

following

pages

this

manual

detail

the

functions

the

various

controls

and

jacks,

and

the

use

the

SRA

400

professional

sound

system.

BEFORE

ATTEMPTING

USE

THE

UNIT,

FAMILIARIZE

YOURSELF

WITH

THE

INFORMATION

CONTAINED

THIS

MANUAL.

SECTION

SRA

400

FRONT

AND

REAR

PANELS

SRA

400

FRONT

PANEL

Input

Attenuators

(Fig.

Item

Each

these

two

calibrated

stepped

input

at¬

tenuators

lowers

the

input

signal

level

its

respec¬

tive

channel,

ahead

amplification

stages.

The

gain

the

amplifier

indicated

dBV.

The

CAL

position

indicates

the

calibrated

setting

which

(1.23

volts

RMS)

will

drive

the

amplifier

full

power.

CIRCUIT

BREAKER/POWER

SWITCH

(Fig.

Item

This

combination

Circuit

Breaker/Power

Switch

con¬

trols

power

the

SRA

400

unit.

The

internal

lamp

glows

green

when

the

power

turned

on.

The

circuit

breaker

will

shut

off

power

the

event

amplifier

overload.

POWER

OUTPUT

DISPLAYS

(Fig.

Item

The

ten

segment

LED

bar

graph

displays

indicate

power

delivered

the

load

for

each

channel.

These

electronic

displays

respond

quicker

than

ordinary

mechanical

meters,

and

thus

allow

accurate

monitoring

program

peaks.

The

displays

are

cali¬

brated

indicate

decibels

below

rated

power

(200

watts

into

ohms,

100

watts

into

ohms).

The

dis¬

plays

are

color

coded,

with

the

red

LED

indicating

full

power.

SRA

400

REAR

PANEL

CHANNEL

INPUT

(Fig.

Item

CHANNEL

INPUT

(Fig.

Item

These

phone

jacks

each

channel

are

unbalanced

and

are

used

connect

external

signal

such

that

from

the

output

mixer,

the

respective

power

amplifier

input

channel.

CHANNEL

OUTPUT

(Fig.

Item

CHANNEL

OUTPUT

(Fig.

Item

For

operator

convenience,

standard

phone

jack

and

banana

jack,

wired

parallel,

are

provided

output

connectors

for

each

channel.

They

are

used

connect

each

speaker

enclosure

its

respective

channel.The

total

impedance

the

speaker

each

channel

should

not

less

than

ohms.

CHANNEL

OUTPUT

FUSE

(Fig.

Item

CHANNEL

OUTPUT

FUSE

(Fig.

Item

These

fuses

are

connected

series

with

their

re¬

spective

speaker

jacks.

They

protect

the

speakers

the

event

amplifier

failure,

and

prevent

damage

the

amplifier

caused

driving

low

impedance

loads.

Each

fuse

rated

amperes,

250

volts,

and

should

replaced

only

with

one

the

same

rating

and

type

(Littlefuse,

catalog

number

312006,

equivalent).

MODE

SWITCH

(Fig.

Item

This

switch

selects

one

the

following

amplifier

modes

operation.

Stereo

Normal

dual

channel

operation.

Mono:

Connects

the

inputs

both

channels

to¬

gether.

this

mode

signal

input

channel

also

input

channel

This

mode

eliminates

the

use

“Y”

cord

monophonic

sound

applications.

Bridged:

Converts

the

SRA

400

into

single

chan¬

nel

400

watt

amplifier.

The

input

applied

channel

and

the

input

channel

should

NOT

used.

The

gain

controlled

the

channel

input

at¬

tenuator.

The

load

connected

across

the

red

banana

terminals.

Minimum

load

ohms.

Opera¬

tion

into

smaller

loads

will

trigger

the

protective

cir¬

cuitry

and

cause

the

amplifier

shut

off.

FAN

(Fig.

Item

This

fan

cools

the

tunnel

heatsink

and

power

transis¬

tors

the

SRA

400

while

operation.

insure

adequate

airflow

sure

that

the

fan

opening

not

blocked

during

operation.

internal

thermostat

au¬

tomatically

switches

the

fan

high

speed

when

the

heatsink

temperature

rises

above

60°C

(140°F).

FIGURE

—

Rear

Panel

SECTION

SETTING

THE

SYSTEM

SOUND

SYSTEM

CONNECTIONS

The

SRA

400

stereo

(two

channel)

amplifier

and

special

care

must

taken

setting

up.

The

unit

contains

two

channels

power

amplification,

and

offers

some

special

connections

which

may

ad¬

vantageous

under

certain

conditions.

The

normal

set-up

and

some

the

special

connections

are

de¬

tailed

this

section.

RACK

MOUNTING

FOR

SRA

400

The

SRA

400

can

used

stand

alone

unit,

preferred,

can

mounted

with

other

equipment

standard

19”

(48.3cm)

rack.

rack

mounting

de¬

sired,

may

necessary

remove

the

plastic

feet

from

the

bottom

the

amplifier.

Unscrew

them

with

Phillips

head

screwdriver.

After

removing

the

feet,

re-install

the

screws

into

the

chassis.

addition

mounting

the

amp

its

front

panel,

recom¬

mended

that

the

rear

the

amp

securely

sup¬

ported

the

rack.

For

installation

portable

racks,

rear

support

mandatory.

SPEAKER

CONNECTION

Each

output

channel

the

SRA

400

designed

for

minimum

total

load

impedance

ohms.

the

total

impedance

the

speakers

either

channel

output

less

than

ohms

the

amplifier

will

overloaded

and

cause

the

corresponding

channel’s

speaker

fuse

blow.

For

example:

high

volume,

overload

might

occur

two

ohm

speakers

were

plugged

into

one

channel’s

pair

output

jacks

parallel

connec¬

tion

resulting

load

impedance

ohms).

Con¬

nect

the

speakers

the

power

amplifer

using

#18

AWG

larger

unshielded

wire.

‘‘Zip

Cord”

suitable

for

this

purpose.

For

long

runs

speaker

cable

(over

feet),#16

AWG

larger

wire

recommended.

While

use

shielded

guitar

cable

connect

the

speakers

will

not

damage

the

equipment,

loss

volume

damage

the

shielded

cable

may

result.

Choose

only

high

quality

Va"

phone

banana

plugs,

and

check

the

cables

for

possible

short-circuits;

internal

short-circuit

cracked

phone

plug

in¬

sulator

might

blow

fuse

the

power

amplifer.

STEREO

PROGRAM

CONNECTION

(Fig.

The

conventional

stereo

program

system

set-up

illustrated

Figure

this

connection

the

program

outputs

conventional

stereo

mixer

are

fed

the

corresponding

channel

inputs

the

SRA

400.

Channel

outputs

the

SRA

400

are

then

connected

their

corresponding

speakers.

MONOPHONIC

CONNECTION

(Fig.

This

shows

how

monophonic

signal

source

such

one

program

channel

mixer,

can

used

drive

both

channels

the

SRA

400

power

amplifier

monophonic

mode.

Set

mode

switch

mono.

Con¬

nect

the

monophonic

signal

source

channel

input.

Both

channels

will

driven

the

input

channel

MONOPHONIC/MONITOR

CONNECTION

(Fig.

This

diagram

shows

that

stereo

program

output

not

necessary,

one

channel

power

amplification

the

SRA

400

may

allocated

the

program

mate¬

rial,

and

the

other

the

monitor

material.

the

case

illustrated,

channel

has

been

allocated

the

pro¬

gram

material,

and

channel

has

been

assigned

the

monitor

material.

STEREO

BI-AMPLIFIED

CONNECTION

(Fig.

bi-amplified

system

can

provide

increased

head-

room,

efficiency,

damping

factor,

and

decreased

distortion.

The

SRA

400

power

amplifier

can

in¬

corporated

bi-amplified

sound

systems

realize

these

advantages.

This

diagram

shows

the

left

and

right

program

mixes

fed

two

channel

electronic

crossover,

where

each

channel

frequency

divided

into

low

frequencies

and

high

frequencies.

The

left

program

channel’s

low

frequency

material

fed

the

SRA

400

channel

input,

while

the

left

program

channel’s

high

frequency

material

fed

the

SRA

400

channel

input.

The

SRA

400

channel

output

connected

the

high

frequency

driver

(tweeter)

the

left

bi-amplified

speaker.

The

SRA

400

channel

output

connected

the

low

frequency

driver

(woofer)

the

left

bi-amplified

speaker.

Similarly,

the

right

program

channel’s

material

processed

and

eventually

amplified

additional

stereo

power

amplifier

and

fed

right

bi-amplified

speaker.

STEREO

BI-AMPLIFIED

CONNECTION

(Fig.

This

diagram

shows

second

bi-amplified

scheme

that

widely

used.

this

stereo

system

one

power

amplifier

used

amplify

only

the

highs,

and

another

amplifier

process

the

lows.

most

popu¬

lar

music

low

frequency

material

contains

con¬

siderably

energy

than

high

frequency

material,

and

most

sound

reinforcement

speaker

systems

have

high

frequency

drivers

which

have

greater

ef¬

ficiencies

than

their

associated

low

frequency

driv¬

ers.

result,

the

power

amplifier

chosen

amplify

the

high

frequency

material

need

NOT

power¬

ful

the

one

chosen

amplify

the

low

frequency

material.

the

system

shown

Figure

the

SRA

400

was

chosen

the

low

frequency

amplifier.

MONOPHONIC

BI-AMPLIFIED

CONNECTION

(Fig.

This

diagram

shows

how

the

SRA

400

can

also

used

independently

monophonic

bi-amplified

system.

BRIDGED

OUTPUT

CONNECTION

(Fig.

This

diagram

shows

how

the

SRA

400

can

used

400

watts

single

channel

amplifier.

Set

mode

switch

BRIDGED.

Connect

input

channel

Leave

channel

input

unused.

Connect

load

across

red

banana

jacks.

Use

smaller

loads

will

cause

protective

circuitry

shut

off

amplifier.

SECTION

III

SRA

400

STEREO

POWER

AMPLIFIER

SOUND

SYSTEM

CONNECTIONS

FIGURE

—

Typical

Stereo

Program

Connection

MODE

SWITCH

SET

MONO

FIGURE

—

Two

Channel

Output

From

Single

Source

(Monophonic)

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