B&K VMR6 User manual

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CONTENTS

PAGE

i

i

B

&

K

"Repeatability"

1

The

VMR-6.5.4

-

Its

Purpose

and

Function

2

Design

and

Construction

2

i

!

Setting

up

the

VMR-6.5.4

2

Safety

&

Care

Considerations

3

The

Inputs

and

Outputs

3

System

Installation

4

Making

the

Connection

4

Setup

and

Checkout

5

Alternate

System

Configurations

5

In

Case

of

Difficulty

6

Fig..

2

-

Rear

Panel

Diagram

7

Fig.

3

-

Speaker

Wiring

Diagram

8

Fig.

4

-

Layout

Diagram

8

Specifications

8

|

Warranty

Inside

Back

Cover

[FC

"Repeatability"

-

your

assurance

of

a

product

reliability

In

days

gone

by,

the

term

"created

carefully

by

skilled

craftsmen”

exemplified

the

meaning

behind

'quality

assurance',

In

the

modern

manufacturing

environment,

those

same

skilled

craftsmen

now

design

the

processes

that

allow

the

economies

of

volume

manufacturing,

while

still

retaining

the

same

high

standards

of

quality.

"Repeatability",

is

the

B

&

K

house

term

for

a

quality

assurance

philosophy

that

is

the

culmination

of

several

well

engineered

manufacturing

processes.

The

four

most

important

of

these

are;

(a.)

a

manufacturing

process

that

functions

in

exactly

the

same

manner

with

each

and

every

audio

component;

(b.)

a

comprehensive

test

of

each

and

every

component

part

prior

to

installation

in

the

circuit

board;

(c.)

final

assembly

by

an

experienced

assembler,

and

(d.)

a

comprehensive,

functional

test

prior

to

final

packaging.

As

a

first

step

towards

manufacturing

a

’repeatable'

component,

B

&

K

employs

the

use

of

the

latest

technology

in

automatic

insertion

equipment

at

their

manufacturing

facility

in

Buffalo,

New

York.

Not

only

does

this

process

provide

a

complete

and

exact

duplication

of

each

and

every

circuit

board,

it

imposes

a

full

test

of

each

individual

component

just

prior

to

insertion

in

the

circuit

board.

Should

any

component

fail,

the

process

is

halted

automalically.

It

can

only

be

resumed

when

the

faulty

component

is

replaced

with

a

serviceable

unit

which,

itself,

must

undergo

the

same

testing

procedure

before

the

process

can

resume.

All

assembly

is

done

by

technicians

who

are

trained

in

the

art

of

doing

the

job

right

the

first

time.

Following

assembly,

the

unit

is

tested

rigorously

for

specification

and

reliability.

Only

then

is

the

unit

packaged

for

shipment.

Our

Pledge

to

You

The

decision

to

purchase

an

audio

component

is

one

you

have

not

taken

lightly.

We

expect

you

will

be

seeking

affirmation

that

your

choice

of

a

B

&

K

audio

product

was

wise

and

practical

and

that

it

continues

to

meet

your

sonic

expectations

each

time

you

turn

it

on.

The

keystone

of

B

&

K

Components

Ltd.

success

is

based

on

taking

the

quality

and

consistency

of

our

products

and

the

needs

of

our

customers

very

seriously.

Therefore,

when

you

make

an

investment

in

a

B

&

K

audio

product,

we

feet

sure

your

satisfaction

with

its

musical

consistency

and

solid

operational

reliability

will

increase

with

each

passing

day.

Also,

should

you

ever

have

a

question

about,

or

a

problem

with,

any

B

&

K

product,

we

are

but

a

phone

or

FAX

call

away.

Thank

you

for

choosing

a

B

&

K

audio

product.

You

will

not

be

disappointed.

Happy

listening,

B

&

K

Components

Ltd.

Buffalo,

New

York

THE

VMR-

6.5.4

-

ITS

PURPOSE

AND

FUNCTION

An

exciting

and

reliable

source

of

high

fidelity,

audio

signal

amplification,

the

VMR-6.5.4

offers

excellent

versatility

and

cost

effectiveness

for

most

multi-channel,

home

entertainment

systems.

The

VMR-6.5.4

is

primarily

a

6

channel

amplifier

capable

of

delivering

a

clean,

fully

musical,

60

watts

r.m.s.

power

output

per

channel(8

ohm

load).

As

well,

the

VMR-6.5.4

offers

a

'bridging

feature

which

allows

those

6

channels

to

be

combined

into

three

more

powerful

Channels.This

presents

an

opportunity

to

use

the

VMR-6.5.4

in

a

number

of

configurations

for

a

variety

of

uses;

the

standard

6

channel

mode;

or

a

5

,

4

or

3

channel

mode.

Such

versatility

makes

the

VMR-6.5.4

a

particularly

compact

source

for

a

multiplicity

of

surround

-sound

or

multi-room

applications.

While

the

B

&

K

Components

Ltd.

VMR-6.5.4

is

engineered

to

interact

harmoniously

with

all

popular

sources

and

line

stages,

the

match

that

approaches

perfection

is

that

of

being

driven

by

any

one

of

the

excellent

B

&

K

preamplifiers

presently

available.

DESIGN

AND

CONSTRUCTION

The

VMR-6.5.4

utilizes

high

quality

electronic

circuitry

to

achieve

an

environment

wherein

a

detailed,

transparent

and

highly

musical

sound

can

be

realized.

The

high

quality

parts

compliment

includes

state-of-the-art

solid

state

devices;1%

metal

film

resistors;

computer

grade

electrolytic

power

supply

capacitors

and

a

high

capacity

toroid

transformer.

The

VMR-6,5,4

operates

class

AB

employing

very

high

current

MOSFET

power

output

stages.

As

such

it

is

capable

of

reproducing

the

most

demanding

digital

or

analog

recordings

at

full

rated

power

levels.

SETTING

UP

THE

VMR-6.5.4

Placement

of

the

amplifier

is

important

and

requires

some

pre-planning.

In

order

to

eliminate

interference

being

induced

in

the

amplifier

by

other

components,

It

must

be

physically

located

a

safe

distance

away

from

all

source

components.

This

will

avoid

their

being

influenced

by

the

fields

being

propogated

by

the

amplifier

when

it

is

under

heavy

load.

Ideally

the

VMR-6.5.4

will

be

located

near

the

speakers.

This

will

minimize

the

adverse

effects

of

inductance,

capacitance

and

any

damping

effect

that

might

result

from

speaker

wires

interacting

with

the

amplifier.

The

VMR-6.5.4

is

equipped

with

raised

feet

so

that

continuous

ventilation

can

be

maintained.

As

well,

they

help

to

maintain

acoustic

feedback

into

the

amplifier

at

a

minimum.

They

also

provide

a

measure

of

protection

against

scratching

any

surface

the

unit

might

be

resting

on.

Note:

Acoustic

feedback

can

be

identified

as

tow

frequency

vibrations

which

are

not

part

of

the

signal

from

the

source

material.

They

also

have

a

tendency

to

become

louder

and

less

controllable

as

you

increase

the

system

volume.

The

most

common

source

of

acoustic

feedback

interference

is

the

result

oi

having

the

preamplifier

and

source

components

too

close

to

the

loudspeakers.

2

.

SAFETY

&

CARE

CONSIDERATIONS

CONNECTING

AND

DISCONNECTING

CABLES

In

order

to

eliminate

potential

damage

to

the

speakers

and

other

components

in

the

system,

always

turn

off

the

amplifier

before

unplugging

or

plugging

in

the

preamplifier's

power

cord.

This

caution

is

also

applied

to

plugging

in

or

unplugging

the

interconnect

cables

running

from

the

preamplifier

to

the

amplifier.

When

plugging

in

or

unplugging

interconnect

cables

running

from

source

to

preamplifier,

always

rotate

the

preamplifier's

volume

control

to

minumum

and

if

available

mute

the

preamplier

first.

POWER

LINE

MODULATION

INTERFERENCE

During

heavy

passages,

the

power

needs

of

the

amplifier

may

fluctuate

considerably.

As

these

needs

are

felt

at

the

power

source,

the

line

voltage

available

will

in

turn

fluctuate,

based

on

the

instantaneous

power

requirement

of

the

amplifier.

It

is

an

effect

somewhat

like

one

person

trying

to

hold

on

to

the

end

of

a

rope

while

another

person

at

the

other

end

is

jerking

it

at

random

intervals.

Therefore

we

recommend

that

you

-

AVOID

CONNECTING

THE

PREAMPLIFIER

OR

THE

SOURCE

COMPONENTS

TO

THE

SAME

POWER

SOURCE

AS

THE

AMPLIFIER

To

do

so

may

subject

the

preamplifier

and

its

sources

to

power

line

modulation

interference

which

could

affect

the

operation

of

the

component,

thereby

resulting

in

a

degraded

audio

signal

from

the

source.

THE

INPUTS

AND

OUTPUTS

Located

on

the

rear

panel,

they

are;

INPUTS

There

are

6

input

signal

connections

to

the

VMR-6.5.4

amplifier

through

high

quality,

gold-plated

connectors.

They

accommodate

audio

cables

utilizing

standard

RCA

plugs.

[See

Fig.

1(a)].

OUTPUTS

There

are

6,

high

quality,

5-way

binding

posts;

one

for

each

channel.

They

are

designed

to

accept

a

banana-type

plug

or

a

spade

lug

connector,

[see

Fig.

1(b)

&

(c)]

DO

NOT

REMOVE

CABINET

FEET,

KEEP

AMPLIFIER

WELL

VENTILATED

AT

ALL

TIMES.

SYSTEM

INSTALLATION

CONSIDERATIONS

There

will

most

likely

be

a

number

of

cables

involved

in

the

installation

of

your

home

entertainment

system.

Therefore,

pre-planning

is

essential

in

order

to

maximize

system

efficency.

We

recommend

the

following

as

a

means

of

helping

you

reach

that

goal.

-

Use

the

diagram

on

page

8

of

this

manual,

or

make

your

own

diagram

of

your

proposed

system,

to

lay

out

the

location

of

components,

the

VMR-6.5.4.

and

the

proposed

cable

runs

between

them

in

the

room.

Number

each

cable

and

record

its

length

on

the

drawing

for

future

reference.

For

example,

"

#

3

-

IN

-1

2

*

"

denotes

input

cable

from

source

channel

#

3

and

that

it

is

12

feet

long.

"

#

1

OUT

(L.REAR)

-

20"

denotes

that

#

3

speaker

output

has

been

assigned

to

the

left

rear

speaker

and

that

its

length

is

20

feet.

-

Cable

runs

are

critical

in

that

they

must

be

kept

away

from

sources

of

power

radiationfamplifiers,

power

cords,heaters

etc.).

For

the

sake

of

safety,

they

should

also

be

kept

out

of

traffic

areas.

-

The

process

of

optimizing

the

system

will

include

the

type

of

cable,

the

length

of

run

and

the

obstructions

it

must

deal

with

along

its

run.Your

dealer

can

advise

you

on

the

products

available

and

their

relative

merits.

If

building

custom-length

audio

cables

is

not

your

strength,

your

dealer

should

be

able

to

help

you

with

that

as

well.

If

you

would

like

to

utilize

the

bridging

option

which

converts

two

channels

in

order

to

create

a

more

powerful

single

channel,

see

the

ALTERNATE

SYSTEM

CONFIGURATIONS

section.

For

the

standard

configuration

of

one

channel

source

per

input,

most

of

the

planning

will

be

in

determining

which

input

you

wish

to

apply

to

which

channel.

A

typical

connection

diagram

is

shown

in

Fig.

3(a).

For

other

methods

of

setting

up

your

system,

see

the

section

ALTERNATE

SYSTEM

CONFIGURATIONS.

MAKING

THE

CONNECTION

1.

Before

doing

anything,

ensure

that

the

power

switch

on

the

amplifier's

front

panel

is

in

the

'off'

position.

Again,

it

is

recommended

that

you

locate

a

separate

AC

power

outlet

for

the

VMR-6.5.4,

one

that

is

not

shared

by

any

other

audio

component

in

the

system.

This

will

eliminate

the

possibility

of

the

amplifier

'modulating'

the

power

being

supplied

to

the

component

and

compromising

the

signal

originating

from

that

component.

2.

Locate

the

AC

power

supply

cord

and

plug

it

into

the

power

input

receptacle

in

the

rear

panel.

Do

not

connect

it

to

the

AC

power

supply

as

yet.

3.

Connect

the

audio

cables

from

your

preamplifier's

output

to

the

selected

channel's

input

connectors.

Make

note

of

the

input

number(as

suggested

in

the

"Considerations"

section

above)

so

that

the

correct

speaker

cable

can

be

connected

to

the

speaker

output

with

the

same

number,

A

rear

panel

connection

guide

is

shown

in

Fig.

2(a).

4.

C

onnect

the

cables

from

your

speakers

to

the

appropriate

CHANNEL

output.

MAKING

THE

CONNECTION

(conl’d

)

5.

Double-check

the

cable

connections(both

ends)

to

ensure

they

are

plugged

into

the

correct

jacks

for

the

source

(L

or

R

-

front,

rear

or

side)

and

that

the

connection

is

tight.

6.

With

the

volume(gain)

control

on

your

preamplifier

set

to

full

minimum,

or

switched

to

'mute',

plug

the

amplifier’s

power

cord

into

the

AC

power

source.

Turn

the

VMR-6.5.4

power

switch

'on

1

.

The

panel

light

above

the

switch

should

be

illuminated.

7.

Place

all

level

controls

on

the

VMR-6.5.4

at

maximum.

SETUP

AND

CHECKOUT

The

next

task

will

require

that

you

listen

to

a

source

sampling(tape,

CD

etc.),

noting

the

levels

al

each

point

within

the

system.

During

the

initial

listening

situation,

you

may

find

the

dispersion

of

sound

to

be

unbalanced.

This

could

be

the

result

of

where

you

are

in

relation

to

the

speakers.

It

could

also

be

the

room

acoustics;

or,

it

could

be

the

manner

in

which

the

signal

is

being

distributed

in

the

stages

prior

to

the

amplifier,

The

VRM-6.5.4

provides

you

with

levei

controls

for

each

channel

so

you

can

adjust

the

relative

volume

of

each

channel

to

suit

your

personal

taste.

While

initial

audio

quality

will

be

very

good,

it

should

get

even

better.

Most

high

performance,

audio

amplifiers

require

about

40

hours

of

circuit

forming

{'burn-in')

time

before

maximum

fidelity

wifi

be

fully

realized.

Helpful

Mini:

Some

audiophiles

prefer

to

inaugurate

the

system

as

a

unitfpreamplifier.

cables

and

amplifier).

If

this

is

your

preference,

you

might

try

playing

a

CD

into

the

system

for

about

24

hours

straightfspeakers

connected),

at

a

low

but

listenable

volume

level,

as

one

method

of

'forming'

the

components

and

signal

pathways.

Should

you

encounter

any

inconsistencies

that

cannot

be

traced

to

the

source

or

the

material

being

played,

consult

the

IN

CASE

OF

DIFFICULTY

in

this

manual.

ALTERNATE

SYSTEM

CONFIGURATIONS

CHANNEL

BRIDGING

Channels

1

&

2,

3

&

4

and

5

&

6

are

available

for

bridging

in

order

to

provide

3

channels

capable

of

providing

120

watts

r.m.s.

into

an

8

ohm

load.

However,

due

to

the

relative

complexity

of

the

modification

it

is

recommended

that

this

conversion

be

carried

out

by

your

dealer's

technician

or

at

the

B

&

K

factory

in

order

to

comply

with

warranty

requirements.

For

more

information

on

bridging

the

VMR-6.5.4,

please

contact

your

dealer

or

B

&

K

directly.

BI-WIRING

Bi-wiring

has

the

potential

of

doing

away

with

much

of

the

'mud'

associated

with

processing

all

incoming

frequencies

at

one

input

on

the

crossover

network.

As

a

result,

most

frequencies,

especially

the

bass

will

appear

tighter

and

more

resiliant.

The

mid

range

and

the

highs

will

be

clearer.

How

effectively

this

is

accomplished

will

vary

from

one

speaker

design

to

another.

5

.

BI-WIRING

AT

THE

AMPLIFIER

'NS

(cffllttfl

Bi-wiring

consists

of

the

simple

act

of

running

two

sets

of

speaker

cables

from

the

designated

channel's

speaker

output

to

each

speaker

and,

observing

correct

polarity,

connecting

one

set

to

the

"HI"

terminal

and

the

other

to

the

"LO"

terminal.

A

speaker

with

a

’bi-wire’

option

provides

two

inputs

on

the

rear

panel

of

each

speaker

enclosure,

or

internally

on

the

speaker's

crossover

circuit

board.

There

is

usually

one

input

for

"HI”

frequencies,

and

one

for

the

"LO”

frequencies.

For

normal

operation,

these

inputs

will

likely

be

bridged

with

some

type

of

jumper

configuration.

Usually

it

is

a

matter

of

removing

these

jumpers

to

allow

biwiring.[See

Fig.

3(a)]

The

instruction

manual

enclosed,

with

the

speaker

will

usually

guide

you

through

the

connection

process,

AVOID

SPEAKER/AMPLIFIER

DAMAGE

^

1

OBSERVANCE

OF

POLARITY

IS

ESSENTIAL

DOUBLE-CHECK

CONNECTIONS

BEFORE

TURNING

THE

AMPLIFIER

ON.

THE

AMPLIFIER

CAN

BE

DAMAGED

IF

POLARITIES

ARE

INCORRECT.

2.

DAMAGE

CAN

OCCUR

TO

YOUR

SPEAKERS

IF

THE

POWER

RATING

OF

EACH

INDIVIDUAL

DRIVER

IS

EXCEEDED

BY

THE

AMPLIFIER

.

-

ENSURE

THAT

ALL

THE

DRIVERS

IN

YOUR

SPEAKER

SYSTEM

ARE

CAPABLE

OF

HANDLING

NOT

ONLY

THE

POWER

BEING

DELIVERED

BY

THE

AMPLIFIER(S),

BUT

THE

ENERGY

THAT

IS

LIKELY

TO

BE

GENERATED

DURING

STRONG

PASSAGES.

N---

J

IN

CASE

OF

DIFFICULTY

PROBLEM

POSSIBLE

CAUSE

POSSIBLE

SOLUTION

No

sound

('ON'

LED

not

illuminated)

-

Power

cord

not

plugged

in

-

Power

off

al

AC

source

-

Internal

fuse

blown

or

faulty

-

Reconnect

power

cord

-

Check

AC

sourcciswitch,

fuse

etc.)

-

Check

tor

shorts

or

overloading'

No

sound

on

some

or

all

selected

channels

-

speaker

leads

loose

or

faulty

-

Line

stage

-to-amp.

cables

loose

or

faulty

-

Source

to-iine

stage

cables

loose

or

faulty

-

Line

stage

or

source

not

correctly

selected

-

Tighten,

repair

or

replace

cable

-

Tighten,

repair

or

replace

cable

-

Tighten,

repair

or

replace

cable

-

Check

all

switch

settings

Sound

directionless,

bass

weak

-

Speakers

connected

out

of

phase

-

Check

connections

making

sure

that

cables

are

connected

"+"

to

and

to

Loud

hum

or

buzz

on

one

or

more

channels

-

Poorgound

connection

in

interconnect

cabling

■

Check

ah

connectors

and

repair

as

necessary

*

If

unit

continues

to

blow

fuses,

have

it

serviced.

—

DO

NOT

USE

A

HEAVIER

FUSE!

6

.

Fig.

3

The

two

configurations

shown

represent

the

most

common

forms

of

wiring

the

speaker.

Always

double-check

to

make

sure

polarity

is

correct.

VMR-65.4

(o)

STANDARD-WIRED

SPEAKER

CONFIGURATION

Fig.

4

A

diagram

showing

a

multichannel

layout

of

up

1o

6

channels

using

the

VMR-6.5.4

as

the

main

amplifier.

The

Blocks

adjaceni

to

each

speaker

location

can

be

used

to

enter

information

on

how

you

have

your

system

setup.

There

is

also

a

listing

point

for

source

outputs

in

the

event

you

are

driving

the

amplifier

from

something

olher

than

a

single,

mufti-charnel

(more

than

2

channel)

source.

SPECIFICATIONS

Power

Rating

-

8

ohms

60

watts

Frequency

Response

5Hz

-45KHz

Input

Sensitivity

900

millivolts

THD

(S+N)

0.09%

@

1

kHz

Input

Impedance

24,300

ohms

Damping

Factor

100@50Hz

Current

14

amps

(peak-peak)

Slew

Rate

14

volts/microsecond

!

Dynamic

Headroom

1.4dB

S/N

(A-weighted)

95dB

Voltage

Gain

j

24.3

Line

Power

120VAC

(Fuse:

12ASIo

Bio)

Dimensions

17"(w)

x

15.5"(d)

x

5.25”(h)

[O.A.]

Weight

35

lb.

(16.0Kg)

Specifications

Subject

To

Change

Without

Notice.

8

.