Crown VFX-2 User manual

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VFX-2

IM-1

ete

crown

INSTRUCTION

MANUAL

SERIAL

NO.

ISSUED

TO:

VFX2

DUAL-CHANNEL

FILTER/CROSSOVER

CROWN

INTERNATIONAL,

INC.,

BOX

1000

ELKHART,

INDIANA

46514

TABLE

OF

CONTENTS

SECTION

Section

1

Section

2

Section

3

TITLE

PAGE

INTRODUCTION

1.1

Scope

of

Manual

1.2.

Equipment

Description

1.3.

Specifications

...

14

Warranty

INSTALLATION

AND

OPERATION

2.1

2.2

2.3

24

25

General

....

Unpacking

.

Mounting

Installation

24.1

Cabling

...

2.4.2

Input

Connections

24.3

Output

Connections

244

Glossary

of

Filter

Terms

Operation

occ

2.5.1

Control

Functions

....

2.5.2

Setting

Hi-Pass

Hz

Filter

Frequency

2.5.3

Setting

Lo-Pass

Hz

Filter

Frequency

2.54

Setting

Controls

for

Bandpass

Filter

Operation

..

14

2.5.5

Mono

(Balanced)

Output

Application

......

CIRCUIT

DESCRIPTION

3.1

3.2

33

34

General

woe

Circuit

Description

..

3.2.1

Filtering

Circuits

..

3.2.2

Power

Supply

Circuits

Test

Procedures

Service

Policies

LIST

OF

ILLUSTRATIONS

FIGURENO.

TITLE

PAGE

1-1

VFX2

Dual-Channel

Filter/Crossover

...

wl

1-2

Typical

Frequency

Response:

IHF

Load

at

Rated

Output

3

1-3.

Typical

Phase

Response:

No

Filters

1-4

Typical

Phase

Response:

High

and

Low

Pass

Filters

1-5

%

IM

Distortion

-

All

Controls

Flat

with

IHF

Load

1-6

Typical

Filter

Curves

...

1-7

Typical

Maximum

Output:

IHF

Load

.

ae

1-8

Typical

Common

Mode

Rejection

.........

aw

6

2-1

Mounting

Dimensions

2-2

Typical

System

Configurations

and

Cables

.

w

@9

2-3.

Phone

Plug,

%",

3-Conductor

o...cccecceeeee

weld

2-4

Phone

Plug,

'4",

2-Conductor

......

2-5

Front

Panel

Controls

2-6

Rear

Panel

Controls

and

Commectors

.....cccccscssssssscssessessessssssessncscsscsvessestevessesavsevancarsesans

12

SECTION

1

INTRODUCTION

REAR

VIEW

FRONT

VIEW

FIGURE

1-1

VFX2

DUAL-CHANNEL

FILTER/CROSSOVER

1.1

SCOPE

OF

MANUAL

This

manual

is

intended

to

provide

the

user

necessary

technical

information

required

to

operate

the

CROWN

VFX2

Dual-channel

Filter/

Crossover

unit

properly

and

to

maintain

the

unit

in

optimum

operating

condition.

The

manual

is

comprehensive,

containing

a

physical

description

of

the

VFX2,

electrical

and

mechanical

specifications,

complete

installation

and

operating

instructions,

a

detailed

circuit

description,

test

procedures

and

service

policies.

Also

included

are

a

complete

parts

list

and

the

associated

VFX2

schematic

to

assist

in

identification

of

parts

and

understanding

the

functional

operation

of

the

VFX2.

A

thorough

reading

of

this

manual

and

strict

adherence

to

the

instructions,

procedures

and

cautions

will

assure

many

years

of

professional

quality

service

and

listening

enjoyment

from

your

CROWN

VFX2

Dual-Channel

Filter/

Crossover.

1.2

EQUIPMENT

DESCRIPTION

The

CROWN

Model

VFX2

is

a_

dual-channel

filter/

crossover

unit

specifically

designed

to

provide

continuously

variable

filters

to

perform

either

high

pass/

low

pass

or

bandpass

functions

in

professional

or

commercial

sound,

or

home

“‘hi-fi”

applications.

The

VFX2

is

a

compact,

ruggedly

constructed

unit

designed

to

fit

a

standard

19”

rack

mount

(W.E.

hole

spacing)

and

occupies

only

3%"

of

vertical

rack

space.

Maximum

depth

from

the

mounting

surface

is

5%".

The

chassis

is

all

aluminum

black

and

satinized

anodized

and

the

entire

unit

weights

only

6

pounds.

Front

panel

controls

are

four

sets

of

range/vernier

knobs

for

the

Hl

and

LOW

PASS

Hz

setting

of

the

ilters

in

the

two

audio

channels

and

a

rotary

POWER

ON-OFF

switch.

Rear

panel

controls

are

a

screwdriver-adjustable

LEVEL

(attenuator)

control

and

a

mode

switch

for

selecting

either

CROSSOVER

(low

pass)

or

FILTER

(bandpass)

outputs

for

each

audio

channel.

Rear

panel

connectors

include

a

variable

gain

bridging

input

for

each

channel!

in

addition

to

the

unity

gain

unbalanced

input.

Output

connectors,

both

high

pass

and

low

pass,

are

provided

for

inverted

and

non-inverted

(NORMAL)

modes.

An

AC

ine

fuse

to

protect

the

unit

and

the

power

transformer

are

also

located

on

the

rear

panel.

1.3

SPECIFICATIONS

Frequency

Response

Phase

Response

Output

Inputs

Gain

Hum

and

Noise

Distortion

Filters

Semiconductor

Complement

Power

Requirements

Fusing

Controls

Connectors

Chassis

Finish

Dimensions

Weight

VFX-2

Dual

Channel

Variable

Electronic

Filter-Crossover

+0.1dB

20Hz

to

20KHz

with

IHF

load

Typically

+0.2dB

2Hz

to

58KHz

with

IHF

load,

+0.5dB

18Hz

to

38KHz

with

600

2

load

All

tests

with

filters

flat

and

at

rated

output.

(See

graph)

See

graph.

10V

Maximum

before

overload,

2.5V

rated

50

2

output

impedance

accepts

600

2

load

(typically

6.4V

maximum

into

600

@

)

All

outputs

available

in

normal

(non-inverted)

and

inverted

modes.

Two

types

per

channel:

Transformerless

bridging

input

with

4"

phone

jack

or

attenuator,

20K

ohm

bal-

anced,

10K

ohm

unbalanced

OR

Unity

gain

input

4”

phone

jack,

1M

ohm

unbalanced.

For

balanced

input

common

mode

rejection

see

graph.

0-15.5dB

from

balanced/

unbalanced

input

More

than

100dB

below

rated

output

with

OdB

gain,

20Hz

to

20KHz.

All

tests

with

filters

flat.

IM

distortion

less

than

0.01%

at

rated

output.

IHF

or

6002

with

filters

flat

or

set

at

20Hz

and

20KHz

(See

graph).

Separate

18dB

Butterworth

Highpass

and

Lowpass

Filters

with

adjustable

corner

frequencies.

Can

be

internally

cascaded

to

form

band

pass

and

band

reject

filters.

(See

graph)

10

integrated

circuits

(20

operational

amplifiers

equivalent

to

400

transistors

and

40

diodes)

for

a

total

of

402

transistors,

2

zeners

and

56

diodes.

2

Watts

120

VAC

or

240

VAC

50-400Hz

For

120

VAC

use

3

AG

1/8

Amp

250

VAC

fuse

(For

240

VAC

use

AGC

1/16

Amp

250

VAC

fuse)

Range

and

vernier

controls

for

corner

frequencies

and

power

switch

are

on

front

panei.

Screwdriver-adjustable

input

attenuator

on

rear

panel.

Inputs

—

3

conductor

4"

phone

jack

balanced/

unbalanced

2

conductor

4"

phone

jack

unbalanced

unity

gain

Outputs

—

2

conductor

’”

phone

jack

AC

line

—

Three

wire

(grounded)

male

connector

on

5

ft.

minimum

cable

All

aluminum

black

and

satinized

anodized

19”

standard

rack

mount

(W.E.

hole

spacing),

3%"

height,

5%”

maximum

depth

(from

mounting

surface)

6

Ibs.

1.4

WARRANTY

cluded

with

this

manual.

The

WARRANTY

is

subject

to

the

conditions

contained

therein.

Upon

receipt

of

the

registration

form,

CROWN

will

issue

a

WAR-

RANTY

TITLE.

This

title

applies

to

the

original

end-

purchaser

as

well as

subsequent

purchasers.

CROWN

guarantees

this

equipment

to

perform

as

specified.

CROWN

also

warrants

the

components

and

workmanship

of

this

equipment

to

be

free

from

defects

for

a

period

of

3

years

from

date

of

purchase.

This

warranty

does

not

extend

to

fuses,

and/or

com-

You,

the

purchaser(s),

are

responsible

for

accurate,

ponent

or

equipment

damage

due

to

negligence,

complete

records

(sales

slips,

invoices,

etc.)

for

FULL

coverage!

misuse,

shipping

damage

or

accident;

or

if

the

serial

,

altered

or

removed.

A

copy

of

the

FULL

THREE-YEAR

WARRANTY

is

in-

number

has

been

defaced

1db

Odb

-2db

1Hz

10Hz

100Hz

1KHz

10KHz

100KHz

1Hz

FIGURE

1-2

TYPICAL

FREQUENCY

RESPONSE:

IHF

LOAD

AT

RATED

OUTPUT

DEGREES

in

=

-15°

-30°

1Hz

10Hz

100Hz

1KHz

10KHz

100KHz

THz

FIGURE

1-3

TYPICAL

PHASE

RESPONSE:

NO

FILTERS

DEGREES

360°

in

a

tt

a

a

]

180°

90°

0°

I

fee

oS

po

a

90°

-7180°

-270°

-360°

LHz

10Hz

100Hz

1KHz

10KHz

100KHz

MHz

FIGURE

1-4

TYPICAL

PHASE

RESPONSE.

HIGH

AND

LOW

PASS

FILTERS

%

iM

-0010

100V

10V

1v

1V

-01V

FIGURE

1-5

—

ALL

CONTROLS

FLAT

WITH

IHF

LOAD

IM

DISTORTION

%

2

3

-20db

1Hz

10Hz

100Hz

1KHz

10KHz

100KHz

-1Hz

10db

-

Sa

aaa

|

setates,

Odb

-10db

-20db

1Hz

10Hz

100Hz

1KHz

10KHz

100KHz

-1Hz

FIGURE

1-6

TYPICAL

FILTER

CURVES

So

=

1Hz

10Hz

100Hz

1KHz

10KHz

100KHz

Hz

7

TYPICAL

MAXIMUM

OUTPUT;

IHF

LOAD

FIGURE

1

Yn

‘i

{

|

|

-

des

SLaoemiape

aera

nota

(abet

ate

ae

ts

Seis

Pal

a

sr

ten

anes

s

Soe

ae

ee

(occa

Sees

iceman

:

:

;

i

60db

70db

80db

90db

100db

110db

120db

1Hz

10Hz

100Hz

1KHz

10KHz

100KHz

Hz

FIGURE

1-8

TYPICAL

COMMON

MODE

REJECTION

2.1

GENERAL

This

section

contains

information

for

unpacking

the

unit,

reporting

procedures

for

damaged

shipments,

mounting

instructions,

cabling

diagrams

for

various

operational

modes

and

a

description

of

control

functions

and

settings.

2.2

UNPACKING

Immediately

upon

receipt

of

the

VFX2

shipment,

inspect

the

unit

for

any

damage

incurred

in

transit.

The

unit

was

carefully

inspected

and

tested

and

left

the

factory

unmarred.

Notify

the

transportation

company

immediately

if

any

damage

is

found.

Only

the

consignee

may

initiate

a

claim

with

the

carrier

for

damage

during

shipment.

However,

CROWN

will

cooperate

fully

in

such

an

event.

Be

sure

to

save

the

carton

as

evidence

of

damage

for

the

shipper’s

inspection.

CROWN

recommends

that

you

save

the

packing

materials,

even

if

the

unit

arrives

in

perfect

condition.

They

will

prove

valuable

in

preventing

SECTION

2

INSTALLATION

AND

OPERATION

damage

should

there

be

occasion

to

transport

or

ship

the

unit.

Both

the

carton

and

internal

pack

are

specifically

designed

for

protection

during

transit.

Do

not

ship

the

unit

without

this

factory

pack!

2.3

MOUNTING

The

VFX2

is

specifically

designed

for

standard

19”

rack

mounting,

but

may

be

custom

mounted

if

suf-

ficient

support

is

provided.

Refer

to

Figure

2-1

for

mounting

dimensions.

Supplied

with

the

VFX2

is

a

decorative

smoked

acrylic

overlay.

The

overlay

functions

as

a

protective

shield

preventing

the

front

panel

control

settings

from

being

accidentally

bumped.

The

VFX2

can

be

mounted

to

the

rack

or

cabinet

by

using

the

10-8

adapter

stud

supplied.

The

overlay

then

fits

over

the

stud

and

is

secured

by

black

dress

nuts.

cy

D-----+

in

alalaialaate

3172"

3

&

|

Bowe

enters

foc

|.

Ja

3/8"

is"

8

3a"

(STANDARD

RACK

MOUNT

} (

MAX.

DEPTH

FROM

MOUNTING

SURFACE)

FIGURE

2-1

MOUNTING

DIMENSIONS