Yamaha NS-615B User manual

esa

aan

ATOY

“ANÊ

REALL

SE:

NBA

het

ERA

ERECT

RENO

Erm

The

NS-615B

has

been

designed

accordance

with

Yamaha

Audio’s

policy

accurately

and

naturally

reproducing

not

just

“sound,”

but

"music."

Its

directivity

characteristics

are

especial-

superior,

and

dB/1

output

the

distor-

tion

rate

very

low

—

less

than

over

100

Hz.

woofer

with

large

diameter

voice

coil,

tweeter

with

unique

tangential

edge

support

and

enclosure

benefitting

from

Yamaha's

genera-

tions

woodworking

experience

all

add

compact,

high

performance,

high

power

handling

capacity

unit.

Enjoy

the

natural

sound

all

types

music

your

heart's

content

with

the

stylishly

com-

pact

NS-615B.

The

NS-6158

grille

removable.

remove

the

grille,

first

grasp

the

bottom

both

sides

and

gently

pull

away

from

the

cabinet.

Once

it is

loose,

continue

removing

the

upper

part.

During

removal,

careful

not

damage

the

attachment

parts.

The

output

terminals

your

amplifier

can

take

several

different

shapes.

sure

check

the

amplifier

owner's

manual

for

proper

connection

procedures.

The

higher

the

amplifier's

maximum

output

power

capacity,

the.

capable

providing

low-distortion

music

response.

However,

your

amplifier

capable

producing

power

excess

the

NS-615B

maximum

input

capacity

important

that

this

maximum

capacity

should

not

exceeded.

general,

when

amplifier

vol-

ume

control

set

its

mid-point

the

amplifier

producing

approximately

70%

its

maximum

output

capacity.

con

Connect

the

speaker

output

terminals

the

amplifier

the

terminals

the

rear

the

NS-

615B

using

the

connector

cords

provided.

this

time

sure

the

amplifier

power

switched

off.

The

connection

terminals

the

rear

the

NS-

615B

are

push-spring

types,

shown

the

illustration.

Connect

the

left

speaker

the

amplifier

left-

channel

output

terminals,

the

right

the

right.

each

case

sure

observe

the

proper

plus-

minus

polarity.

the

polarity

different

for

the

speakers,

stereo

response

and

tonal

clarity

will

affected.

The

side

the

cord

with

the

silver

line

plus

(+),

the

other

side

minus

(—).

The

NS-615B

impedance

ohms.

When

con-

necting

transistor

amplifier,

not

neces-

sary

worry

about

terminal

impedance;

simply

connect

the

output

terminals

the

amplifier.

you

are

using

tube-type

amplifier,

however,

sure

that

only

ohm

terminals

are

used.

Connect

the

red

terminal

plus

terminal

the

am-

plifier,

also

the

black

terminal

minus

terminal.

Push

the

lever

the

bottom

the

terminal,

and

insert

the

stripped

end

the

wire

into

the

hole

while

holding

the

lever

down.

Then

release

the

lever

fix

the

wire.

Plus

Terminal

Minus

Terminal

SFEARER

LOCATII

Your

speaker

performance

depends

great

extent

upon

the

conditions

your

listening

room.

derive

maximum

listening

pleasure

from

your

NS-615B

system,

sure

the

points

below.

placing

the

speaker

that

the

tweeter

the

height

which

you

normally

listen

(for

example,

solid

shelf

bookcase),

you

can

obtain

natural

concert

hall

feeling.

Placing

the

speakers

directly

the

floor

the

carpet

will

impair

the

bass

response,

there-

fore

they

should

placed

heavy,

solid

stands.

Ideally,

left

and

right

speakers

should

separated

distance

1.5

—

meters.

they

are

placed

too

together

there

will

reduc-

tion

the

stereo

effect.

Conversely,

placed

too

far

apart,

the

so-called

“middle

omission”

effect

will

occur

and

the

sound

will

become

skimpy.

The

wall

behind

the

speakers

should

have

live

(reflecting)

surface

polished

surface

best),

while

the

wall

behind

the

listener

should

have

sound-absorbing

surface.

This

the

optimum

condition

for

best

sound

reproduction.

the

wall

behind

the

listener

made

con-

crete

has

glass

window,

thick

curtains

should

hung

absorb

the

sound.

This

will

allow

you

listen

natural

sound

without

reverbera-

tion

other

unnecessary

distortion.

Experiment

with

different

locations

make

sure

that

the

balance

walls,

carpet,

etc.

provides

optimum

bass,

midrange

and

treble

response

while

listening.

careful

where

you

place

your

turntable.

the

same

support

the

speakers,

directly

front

them,

howling

can

occur.

Avoid

locations

where

the

speaker

cabinet

exposed

direct

sunlight

high

temperatures.

€

The

NS-615BEB

rated

input

25W,

maximum

input

capacity

50W.

The

following

precautions

should

observed

with

regard

input

power.

Rated

Input

This

value

the

maximum

average

input

pos-

sible

for

long

listening

with

optimum,

fatigue-

free

music

response.

- |

Maximum

Input

Capacity

The

input

can

rise

this

value

for

short

periods.

any

program

source

there

are

peak

values

which

can

rise

dynamic

levels

high

ten

times

that

the

average

level

the

source

material.

However,

these

peaks

should

not

exceed

level

two

times

the

rated

input.

Dynamic

passages

should

regu-

lated

using

level

meters

sure

this

maxi-

mum

not

exceeded.

Operation

Precautions

very

careful

not

exceed

the

RATED

input

any

the

following

cases:

When

the

tone

controls

your

preamp

pre/main

amplifier

are

set

maximum

(bass

treble).

When

special

signal

(created

fast

winding

rewinding

magnetic

tape,

the

shock

noise

when

the

turntable

needle

bumped,

when

the

power

switched

on,

signals

sine

waves

from

signal

generator)

fed

through

the

speakers.

Frequency

Response

and

Harmonic

Distortion

Charac-

teristics

(Imput

6V,

Measured

1m)

100

200

500

10k

20k

40k

DET.

too

boi

10k

20k

40k

Type

2-way

acoustic

suspension

Woofer

JA-1801

180mmó

cone

type

Tweeter

JA-0518

38mmó

soft

dome

type

kHz

(12

dB/Oct)

Crossover

frequency

Fundamental

reso-

nance

frequency

Impedance

Directional

characteristics

(Horizontal

Plane)

Output

sound

pressure

level

Rated

input

capacity

Maximum

input

capacity

Frequency

response

Watt

Input

25W

50W

—

20,000

(+4

—

8dB)

Dimensions

(HxWxD)

Weight

382

215

199

(15"

8-1/2"

7-13/16")

6.0

(13

Ibs

oz)

Specifications

subject

change

without

notice,

SINCE

1887

YAMAHA

NIPPON

GAKKI

„

HAMAMATSU,

JAPAN

Printed

Japan

77Y@

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