Electro-Voice 7300 User manual

ElecfroVoice'

7300

STEREO

POWER

AMPLIFIER

OWNER’S

MANUAL

7300

STEREO

POWER

AMPLIFIER

MASTER

COPY

INTRODUCTION

The

7300

was

designed

deliver

exceptional

performance

and

reliability

affordable

price.

Each

channel

delivers

200

watts

power

into

ohms,

and

300

watts

into

ohms

over

the

full

audio

frequency

range.

the

mono

bridge

mode,

the

7300

can

deliver

over

600

watts.

The

APX

octal

crossover

accessory

provides

the

convenience

on-board,

bi-amp

capability.

The

APX

module

has

preset

selectable

crossover

frequencies

from

10,000

Hz.

Simply

plug

the

module

into

the

octal

sockets

provided

the

rear

the

amplifier

and

your

system

bi-amp

ready.

The

7300

addition

the

growing

family

Electro-Voice

electronic

products.

would

appreciate

any

comments

you

have

regarding

the

performance,

features

reliability

the

7300.

Table

Contents

7300

STEREO

POWER

AMPLIFIER

TABLE

CONTENTS

INTRODUCTION

DESCRIPTION

—

FRONT

PANEL

IA.

Power

Switch

IB.

Power

Status

Indicator

IC.

Channel

Attenuation

ID.

Clip

Indicator

IE.

Protect

Indicators

DESCRIPTION

—

REAR

PANEL

2A.

Input

Connectors

2B.

Octal

Input

Sockets

2C.

Dual

Bridge

Mode

2D.

Output

Connectors

SPECIFICATIONS

INSTALLATION

4A.

Operating

Cautions

4B.

Input

Connections

4C.

Output

Connections

4D.

Grounding

4E.

Ventilation

OPERATION

5A.

Dual/Stereo

Mode

5B.

Bridge

Mode

5C.

APX

Crossover

Option

5D.

Alternate

Operating

Voltage

TROUBLESHOOTING

6A.

Protection

SCHEMATIC

SERVICE/WARRANTY

INFORMATION

***

WARNING

***

The

service

information

contained

within

this

document

for

use

only

Electro-Voice,

Inc.

authorized

warranty

stations

and

qualified

service

personnel.

one

Description

7300

STEREO

POWER

AMPLIFIER

DESCRIPTION

Front

Panel

Power

Switch

—

The

power

switch

turns

the

amplifier

and

off.

IB.

Power

Status

Indicator

—

This

LED

indicates

when

the

unit

on.

IC.

Input

Attenuators

—

Clockwise

rotation

increases

the

amount

amplifier

gain.

ID.

Clip

Indicators

—

When

the

amplifier

driven

into

clipping,

the

clip

indicator

will

illuminate.

avoid

distortion

reduce

the

input

level

until

the

LED’s

longer

light.

IE.

Protect

Indicators

—

The

protect

light

illuminates

when

the

amplifier

overheats

when

shorted

loads

detected

the

amplifier

output.

relay

automatically

disconnects

the

load

from

the

channel

when

problem

detected.

The

amplifier

will

reset

itself

when

the

problem

corrected.

See

the

Troubleshooting

section

for

problem

solving.

Description

7300

STEREO

POWER

AMPLIFIER

FIGURE

—

Back

Panel

View

DESCRIPTION

Back

Panel

Input

Connectors

—

Located

the

left

side

are

two

3-pin-XLR-type

connectors

and

two

balanced

quarter-inch

phone

jacks.

The

inputs

can

also

unbalanced.

See

Figure

for

typical

input

connections.

Octal

Accessory

Sockets

—

Located

above

the

input

jacks,

accessory

octal

sockets

are

provided

for

the

APX

crossover

module.

Twenty-four

crossover

frequencies

are

available

from

10,000

Hz.

Dual/Mono

Bridge

Mode

—

The

mode

switch

located

the

right

channel

input

selects

stereo

mode

bridge-mode

without

any

additional

patching.

Output

Connectors

—

The

speaker

connectors

are

heavy-duty

five-way

binding

posts.

For

protection,

there

bracket

each

side

the

binding

posts.

thriwi

7300

STEREO

POWER

AMPLIFIER

Specifications

SPECIFICATIONS

CONDITIONS

—

dBu

0.775

rms.

Dual-mode

ratings

are

for

each

channel.

Both

channels

operating

rated

output

power

unless

noted.

120

volt

line

voltage

maintained

throughout

testing.

CONTINUOUS

RATED

OUTPUT

POWER

—

(20

Hz,

reference

kHz)

Dual

Mode,

Ohms:

300

watts

<0.10%

THD

Bridge

Mode,

Ohms:

600

watts

<0.10%

THD

Dual

Mode,

Ohms:

200

watts

<0.05%

THD

Bridge

Mode,

Ohma:

400

watts

<0.05%

THD

MAXIMUM

MIDBAND

OUTPUT

POWER

—

(reference

kHz,

THD)

Dual

Mode,

Ohms:

400

watts

Bridge

Mode,

Ohma:

800

watts

Dual

Mode,

Ohma:

250

watts

Bridge

Mode,

Ohma:

500

watts

DYNAMIC

HEADROOM

(reference

kHz)

—

Dual

Mode,

Ohma:

>1.25

Bridge

Mode,

Ohma:

>1.25

Dual

Mode,

Ohma:

>1.0

Bridge

Mode,

Ohma:

>1.0

POWER

BANDWIDTH

(+0,

-3

dB,

reference

kHz)

—

Dual

Mode,

Ohma:

Hz-70

kHz

Bridge

Mode,

Ohma:

Hz-60

kHz

Dual

Mode,

Ohma:

Hz-85

kHz

Bridge

Mode,

Ohma:

Hz-65

kHz

VOLTAGE

GAIN

(reference

kHz)

Dual

Mode:

32.0

Bridge

Mode:

38.0

INPUT

SENSITIVITY

FOR

RATED

OUTPUT

POWER

(reference

kHz,

±0.3

dB)

Dual

Mode,

Ohma:

dBu

775

rms)

Bridge

Mode,

Ohma:

dBu

(0.775

rms)

Dual

Mode,

Ohma:

-t-3

dBu

902

rms)

Bridge

Mode,

Ohma:

dBu

(0.902

rms)

MAXIMUM

INPUT

LEVEL

(reference

kHz)

—

dBu

(7.75

rms)

INPUT

IMPEDANCE

(per

channel,

Hz-20

kHz)

—

Balanced:

>30

kilohms

Unbalanced:

>15

kilohms

PHASE

RESPONSE

(at

rated

output

power,

any

mode)

—

Hz:

+15

degrees

kHz:

-15

degrees

THD

(at

rated

output

power)

—

Dual

Mode,

Ohma,

Hz-20

kHz:

<0.10%

Bridge

Mode,

Ohma,

Hz-20

kHz:

<0.10%

Dual

Mode,

Ohma,

Hz-1

kHz:

<0.01%

Dual

Mode,

Ohms,

kHz-20

kHz:

<0.05%

Bridge

Mode,

Ohma,

Hz-1

kHz:

<0.01%

Bridge

Mode,

Ohma,

kHz-20

kHz:

<0.05%

IMD

[SMPTE]

(at

rated

output

power)

—

Dual

Mode,

Ohma:

<0.05%

Bridge

Mode,

Ohms:

05%

Dual

Mode,

Ohma:

<0.03%

Bridge

Mode,

Ohms:

<0.03%

TIM

[DIM

100]

(at

rated

output

power)

—

Dual

Mode,

Ohms:

<0.05%

Bridge

Mode,

Ohms:

<0.05%

Dual

Mode,

Ohms:

<0.03%

Bridge

Mode,

Ohms:

<0.03%

RISE

TIME

(10%

90%,

rated

output

power)

—

Dual

Mode,

Ohms:

Msec

Bridge

Mode,

Ohms:

Msec

Dual

Mode,

Ohms:

<4.5

Msec

Bridge

Mode,

Ohms:

<5.5

Msec

SLEW

RATE

(at

rated

output

power)

—

Dual

Mode,

Ohms:

>20

V/m

sec

Bridge

Mode,

Ohma:

>30

V/Msec

Dual

Mode,

Ohma:

>30

V/m

sec

Bridge

Mode,

Ohma:

>60

V/m

sec

DAMPING

FACTOR

—

Dual

Mode,

Ohms,

Hz-1

kHz:

>100

Dual

Mode,

Ohma,

kHz:

>40

Bridge

Mode,

Ohma,

Hz-1

kHz:

>200

Bridge

Mode,

Ohma,

kHz:

>50

Dual

Mode,

Ohms,

Hz-1

kHz:

>200

Dual

Mode,

Ohma,

kHz:

>80

Bridge

Mode,

Ohma,

Hz-1

kHz:

>400

Bridge

Mode,

Ohma,

kHz:

>100

CHANNEL

SEPARATION

(below

rated

output

power,

single

channel

operating)

>80

kHz

NOISE

(below

rated

output

power,

A-weighted,

any

mode)

—

>100

AMPLIFIER

PROTECTION

—

Excessive

output

voltage

Shorted

loads

Excessive

phase

shift

LOAD

PROTECTION

Startup/shutdown

transients

fault

COOLING

—

Heatsink:

Thermally

equalized

Ms-inch

aluminum,

black

anodized

heatsink

Dual-Speed

Fan:

106

CFM

(high

speed),

minimum

life

rating

20,000

hours

“C,

43,500

hours

25°C

ambient

temperature

OUTPUT

TOPOLOGY

—

True

complementary

symmetry

OUTPUT

TYPE

—

Dual

Mode:

Unbalanced,

each

channel

Bridge

Mode:

Balanced

OUTPUT

DEVICES

—

Sixteen

250-watt,

250-V/16-A,

TO-3

transistors

CONTROLS

AND

SWITCHES

—

Input

level

controls

(two),

rear

Mode

switch,

rear

Power

switch,

front

FRONT-PANEL

INDICATORS

—

Power

LED

Clip

LED's

(two)

Protect

LED's

(two)

CONNECTIONS

Input:

6-terminal

barrier

strip,

female

XLR-type

connectors

(two)

Output:

4-terminal

barrier

strip

Power:

8-foot,

3-wire,

17-GA

power

cord

with

NEMA

5-15

plug

POWER

REQUIREMENTS

100,

120,

200,

220,

240

ac,

50/60

Hz,

900

watts

POWER

CONSUMPTION/HEAT

PRODUCED

—

(both

channels

operating

dual

mode

with

kHz

Input

signal

stated

output

power

into

ohms,

bridge

mode

Into

ohms)

Idle:

130

watts/0

442

kBTU/hr

Power:

900

watts/2.380

kBTU/hr

Power:

1060

watts/2.584

kBTU/hr

Rated

Power:

1430

watts/2.822

kBTU/hr

Maximum.MIdband

Power:

960

watts/1.564

kBTU/hr

OPERATING

TEMPERATURE

RANGE

—

60®C

(140

ambient

DIMENSIONS

—

Height:

13.3

(5%

in.)

Width:

48.2

(19

in.)

Depth:

32.4

(12%

in.)

COLOR

—

Gray/biack

ENCLOSURE

Rack

mount

chassis,

16-GA

steel

bottom/sides.

Winch

aluminum

top/back,

Winch

6061-T6

aluminum

front

panel

SHIPPING

WEIGHT

—

(48

lb)

NET

WEIGHT

17.7

(39

lb)

interference

Over

temperature

Infrasomc

signals

Low

line

voltage

HEADROOM

vs.

FREQUENCY

NOISE

va.

FREQUENCY

7300

STEREO

POWER

AMPLIFIER

Installation

INSTALLATION

4A.

Operating

Cautions

not

operate

the

amplifier

completely

ciosed,

unventilated

housing.

not

connect

the

outputs

the

channels

parallel.

not

connect

the

output

terminals

battery,

power

supply,

the

power

mains.

Damage

caused

such

hookup

not

covered

the

warranty.

careful

when

making

connections,

selecting

signal

sources

and

controlling

the

output

level.

not

ite

the

input

signal

ground

the

ground

lead

output.

Ground-loop-induced

oscillations

may

occur.

Ensure

that

the

main

power

within

10%

selected

voltage

and

frequency.

Failure

operate

the

unit

within

these

limits

voids

the

warranty.

Use

only

the

proper

size

mains

fuse

for

the

selected

voltage.

not

connect

either

side

the

loudspeaker

cable

ground

when

operating

the

unit

bridged

mode.

The

bridged

mode

balanced

ground.

Make

certain

that

test

equipment

not

ground

referenced

when

testing

the

unit

the

bridged

mode.

Tampering

with

the

circuit

repair

unauthorized

personnel

will

void

the

warranty

the

unit.

4B.

Input

Connections

Two

conductor

shielded

low-impedance

cable

recom¬

mended

for

input

lines

the

amplifier

input.

the

XLR-type

connector

high

(+),

low

(-),

and

ground.

The

Winch

jack

may

used

low

impedance

input.

Tip

high

(

ring

low

(-),

and

the

sleeve

ground.

See

Figure

High

impedance

lines

may

connected

the

amplifier

inputs

with

single-conductor

low

capacitance

sheilded

cable

feet

less

length.

two

conductor

Vi-inch

plug

will

automatically

unbalance

the

input.

help

avoid

hum

buzz

the

output,

certain

that

all

input

cables

are

physically

separated

from

power

wiring

power

transformers.

4C.

Output

Connections

Binding

posts

are

provided

for

speaker

terminations,

the

red

post

high

(+)

and

the

black

post

low

(-).

The

preferred

connector

high

quality

dual

banana

plug.

See

Figure

for

typical

output

configurations.

Before

making

output

connections,

the

input

attenuators

should

turned

off

(full

counterclockwise),

doing

will

eliminate

any

chance

loud

blasts

damage

the

loudspeaker.

Power

loss

the

speaker

wire.

The

impedance

the

speaker

connecting

wire

would

ideally

zero,

all

the

amplifier

output

power

would

delivered

the

speaker

load.

However,

the

impedance

the

speaker

wire

can

become

significant

percentage

the

speaker

impedance.

Thus,

part

the

amplifier

power

"lost"

the

wire

(in

the

form

heat)

and

the

power

delivered

the

speaker

system

six

Operation

7300

STEREO

POWER

AMPLIFIER

AWG

Size

Resistance

(ohms/1000

feet)

Impedance

160

1.00

120

240

480

1.59

150

300

2.50

190

4.02

120

6.39

10.1

16.2

TABLE

—

Cable

Selection

Chart

correspondingly

reduced.

Wire

impedance

higher

when

using

long

wire

runs

and

small

wire

sizes.

Table

shows

the

two-wire

cable

(copper)

lengths

permissable

for

number

wire

sizes

and

speaker

impedances,

avoid

loss

than

0.5

For

loss

(basically

imperceptible)

lengths

may

doubled.

For

2-dB

loss,

the

lengths

would

multiplied

4.4.

general,

note

that

the

higher

load

impedances

allow

much

longer

smaller-gauge

wiring

used.

4D.

Grounding

The

chassis

the

unit

should

grounded.

Connecting

the

chassis

grounds

additional

audio

equipment

the

chassis

ground

the

amplifier

may

help

reduce

noise

and

hum.

4E.

Ventilation

order

offset

the

heat

generated

the

power

amplifier,

necessary

provide

ample

ventilation

around

the

unit.

Avoid

blocking

impeding

the

vent

slots

the

chassis.

Locate

the

unit

where

free

from

direct

sunlight,

humidity,

dust

vibration

help

prevent

problems

which

might

caused

the

environment.

PERATION

5A.

Dual/Stereo

Mode:

the

dual

stereo

mode

the

channels

may

operated

independently.

Before

hook-up

make

sure

that

the

mode

switch

the

dual

position

and

that

the

level

controls

are

down

(FCCW).

Connect

the

inputs

and

outputs

(See

Figures

and

4).

Turn

the

power

amp

and

slowly

increase

level

until

the

desired

output

power

obtained.

either

(clip)

LED

illuminates,

reduce

the

output

with

the

input

attenuators

reduce

the

source

signal

level.

5B.

Bridge

Mode:

Input

connection

should

made

into

channel

only.

not

make

any

input

connections

into

channel

two.

Move

the

mode

switch

bridge

mode

and

make

sure

both

level

controls

are

down

(FCCW).

Connect

the

speaker

across

the

two

red

binding

posts.

Channel

red

post

high

(

channel

red

post

low

(-).

not

make

connection

either

the

black

binding

posts.

Switch

power

and

slowly

increase

amplifier

channel

level

control

until

the

desired

output

power

obtained.

the

clip

LED

indicators

come

on,

reduce

the

power

amp

level

control

the

source

signal

level.

5C.

APX

Crossover

Option:

The

APX

crossover

per

octave

Linkwitz-Riley

filter

network.

There

are

selectable

frequencies

from

10,000

kHz.

*•*

CAUTION

***

user

serviceable

parts

inside.

Hazardous

voltage

and

currents

may

encountered

within

the

chassis.

avoid

electric

shock,

not

perform

any

servicing

unless

you

are

qualified

so.

5D.

Alternate

Primary

Voltage

The

amplifier

can

powered

with

line

voltages

other

than

120

volts

altering

the

primary

wiring

the

power

transformer.

Table

lists

the

primary

wire

color,

the

terminal

block

(TB),

and

the

position

the

wire

should

located

for

operation

the

desired

voltage.

alter

the

transformer

primary

wiring

configuration

use

the

following

procedure:

Disconnect

the

amplifier

from

the

power

source.

Remove

the

ten

screws

securing

the

top

cover.

There

are

three

screws

each

side,

two

screws

the

rear

along

the

bottom

edge,

and

the

two

innermost

screws

inset

into

the

top

strip

the

front

panel.

See

Figure

for

exact

screw

locations.

Discharge

each

large

capacitor

carefully

through

150-ohm,

2-watt

resistor

for

least

one

minute.

See

Figure

Locate

the

two

voltage-selection

terminal

blocks

mounted

each

other

the

side

the

chassis

between

the

power

transformer

and

the

large

capacitor.

The

transformer

has

six

primary

leads.

Disconnect

the

primary

leads

the

power

transformer

pulling

each

wire

firmly

disengage

from

the

terminal

block.

Note:

The

primary

lead

colors

are

black,

brown,

white,

black/white,

brown/white

and

white/black.

Select

the

desired

operating

voltage

Table

and

reconnect

the

wires

accordingly.

Push

each

wire

firmly

into

the

block

until

snaps

into

place.

Relocate

the

fan

wires

according

the

wiring

chart.

Install

the

correct

line

fuse

(values

Table

III).

Plug

the

amplifier

into

variac

and

sweep

the

mains

voltage

from

zero

full

operating

voltage

while

monitor¬

ing

the

amplifier's

rail

voltages.

The

rail

voltage

should

dc,

the

selected

primary

voltage.

10.

Reinstall

the

top

cover

with

the

ten

screws.

C5J

7300

STEREO

POWER

AMPLIFIER

Permanent

Connections*

TBI

(BLK)

LINE

CAP

(BLK)

FUSE

(BLK)

PWR

(BLK)

PWR

LINE

CAP

(BLK)

NEUTRAL

(WH)

Factory

Wiring

(120

TB1

TB2

lolol

BLK/WH

•

FAN

(YL)

brn

BRN/WH

(YL)

FAN

WH/BLK

ifo

T81

TB2

[olo"

BLK

BLK/WH

FAN

(YL)

FAN

(YL)

BRN/WH

BRN

olfo

200

TB1

T82

roiicn

220

TBi

TB2

folfo

240

TBI

TB2

BLK/WH

FAN

(YL)

BRN/WH

FAN

(YL)

WH/BLK

BLK/WH

FAN

(YL)

BLK

BRN/WH

FAN

(YL)

’0

WH/BLK

[IO

BLK/WH

FAN

(YL)

BLK

BRN/WH

FAN

(YL)

WH/BLK

•

NOT

MOVE

THESE

WIRES,

THEY

ARE

COMMON

ALL

PRIMARY

VOLTAGES

TABLE

Primary

Power

Conversion

Chart

for

100-,

120-,

200-,

220-,

and

240-V,

50/60-Hz

Operation

UPPER

SCREWS

FIGURE

—

Top

Cover

Removal

Line

Voltage

Line

Fuse,

314

Series

Normal-Bio

100

Vac

A/250

120

Vac

A/250

200

Vac

A/250

220

Vac

A/250

240

Vac

A/250

TABLE

III

Main

Fuse

Selection

Guide

FIGURE

Capacitor

Discharging

eight

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