Yamaha SR-30 SR-30 OWNERS MANUAL - Page 9

SR

30

USING

THE

REAR

AND

MAIN

IN

TERMINALS

1.

Extra

Signal

Processing

By

inserting

a

stereo

graphic

equalizer

in

the

SR

-,0

surround

sound

signal

path

—the

REAR

terminals

feed

the

INPUTS

of

the

graphic

equalizer,

and

the

OUTPUTS

from

the

equalizer

feed

the

SR

-30

MAIN

IN

terminals

—it

is

possible

to

further

tailor

the

frequency

characteristics

of

the

surround

sound

for

greater

effect.

You

might

want

to

emphasize

only

the

lower

frequency

components

of

the

surround

sound,

for

example,

to

limit

the

surround

effect

to

sounds

in

this

frequency

range:

spaceships

or

planes

rumbling

overhead,

gunfights,

etc.

By

emphasizing

the

middle

-high

frequencies

you

would

enhance

the

surround

effect

on

waves,

wind,

and

other

"environmental"

sounds.

The

possibilities

are

virtually

limitless.

Another

possibility

for

external

signal

processing

is

to

insert

a

stereo

delay

unit

in

place

of

the

graphic

equalizer

as

described

above

(you

could

even

combine

the

two).

Delaying

the

surround

sound

(between

about

10

to

50

millisecfonds

delay)

has

the

effect

of

greatly

enlarging

the

listening

room,

making

it

seem

as

tough

you

are

listening

in

an

extremely

large

hall.

The

SR

-30

REAR

and

MAIN

IN

terminals

are

essentially

an

"insert"

point

between

the

surround

processor

stage

and

the

SR

-30

stereo

power

amplifier

stage.

They

can

be

used

in

a

number

of

ways

to

produce

more

sophisticated

surround

effects,

as

described

below.

2.

Four

-Speaker

Surround

This

is

a

really

sophisticated

setup

that

delivers

surround

sound

from

four

speaker

simultaneously.

Feed

the

REAR

terminals

to

the

inputs

of

another

integrated

amplifier

(NOT

the

one

that

is

driving

your

main

speakers),

then

return

the

signal

from

that

amplifier's

REC

OUT

terminals

to

the

SR

-30

MAIN

IN

terminals.

This

way

you

have

one

pair

of

surround

speakers

driven

by

the

extra

integrated

amp

and

another

driven

by

the

SR

-30

power

amp.

You

could,

for

example,

place

one

pair

of

surround

speakers

behind

you,

and

another

off

to

the

sides

or

facing

the

wall

next

to

the

front

speakers

in

order

to

reflect

the

surround

sound

(see

SPEAKER

PLACEMENT

section).

You

could

even

insert

equalization

between

the

RED

OUT

terminals

of

the

integrated

amp

and

the

SR

-30

MAIN

IN

terminals

so

that

the

two

pairs

of

surround

speakers

deliver

a

different

portion

of

the

surround

signal

frequency

spectrum.

Delay

could

also

be

incorporated

so

that

one

surround

sound

speaker

pair

(preferably

the

rear

speakers)

delivers

a

delayed

surround

sound

in

relation

to

the

other

pair.

3.

High

-Power

Surround

Although

this

will

seldom

be

the

case,

the

SR

-30's

internal

power

amplifier

may

not

have

enough

power

to

produce

the

desired

surround

effect

in

very

large

rooms

in

which

the

surround

speakers

are

placed

a

considerable

distance

from

the

listener.

This

would

be

the

case

in

a

large

-screen

projection

video

"theater"

for

large

audiences.

In

this

appl

ication

the

buss

bars

connecting

the

REAR

and

MAIN

IN

terminals

are

removed,

and

the

REAR

terminals

are

connected

to

the

inputs

of

a

high

-wattage

power

ampl

ifier

or

integrated

amplifier,

which

then

drives

the

surround

speakers.

The

SR

-30

power

stage

is

not

used.

8

Yamaha SR-30 SR-30 OWNERS MANUAL - Page 9

Using, Terminals

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