Aiwa CX-NA71 S%#72 d, DIiiEimFront 180$peaker system, Aiwa’s, Speaker, System, sound, stereo

DIiiEimFront 180°$peaker system

(%S%#72 d)

Aiwa’s

Front

180°

Speaker

System

provides

,~

—

Sound

wave

excellent

sound

balance

for

true

stereo .

~~

.{

emission mouth

reproduction from any listening angle.

for uni-directional

“ ~~

sound

In

stereo

sound

reproductions

systems

up

to

-—

I

~\

now,

the

listening

area

where

the

optimal

stereo

Cardioid

‘

‘p’”

“*IU

Tweeter

effect

is

obtained

has

been

extremely

narrow.

speaker

Y

This

is

due

to

the

following

reasons.

.—

—_ZZ

As

shown

in

Figure

2,

a

conventional

stereo

Surround-

3

system

has

speakers

on

the

front

panel

of

the

speaker

“““ffi$

4

Woofer

speaker system, pointing forward. It is designed

( ,g

for listening in a location directly in front

(UJ

\

of the front speaker panel.

(13ightspe~Q

&

In this case, as shown in Figure 2, a listener

at point @, located on the center line between

~]

Stereo

effect

with

a conventional

speaker

the

right

and

left

speakers,

hears

the

voice

of

1

a

singer

coming

from

the

center

front.

system

Main unit

Instrumental

sounds

are

distributed

evenly

between both speakers for an optimal stereo

effect.

Left

Right

At point ~, however, located off the center

speaker

speaker

line between the speakers, the distance from

the left speaker to the listener is greater

than the distance from the right speaker. Sound

from the left speaker appears to be faint, and

sound from the right speaker appears to be

loud. Sound is perceived as coming from the

speaker with the greater volume, so that the

singer’s voice appears to shift toward the right

speaker. The normally balanced instrumental

sounds also appear to come primarily from the

right

speaker.

Moreover,

since

the

directivity

of

speakers

increases

with

higher

frequencies,

high-

frequency sounds from the left speaker become

even

harder

to

hear,

increasing

the impression

@ Center listening

point:

Balanced

sound

heard

from left

of

imbalance.

For

these

reasons,

the

listening

and

right

speakers

area

which

provides

even

sound

balance

and

the

@Off-center

listening

point:

Right

speaker

sounds

louder

optimal

stereo

effect

is

limited

to the

narrow

than

leftspeaker

area

shown

in

Figure

2-@.

+: Sound

pressure

level

,;ilj$*@J:

Stereo

listening

area

To solve this problem, Aiwa has developed uni- directional speakers for this new speaker system featuring cardioid directivity for frequencies of 1 kHz or less. These speakers are pointed inward at angles of 45° (see Figure 1) . Driven by left and right stereo sound signals, these speakers act to increase the width of the optimum listening area (see Figure 3) . Because of their cardioid directivity and the 45° angle of their main speaker axis, they provide enhanced sound reproduction at point@ in Figure 3. The left speaker is pointed toward the listener, and the right speaker is pointed away from the listener, so that the directivity of the speakers compensates for the differences in perceived volume caused by the differences in distance to the listener. Therefore, the sound of a singer’s voice is perceived as coming from a

point midway between the speakers, and instrumental sounds are distributed evenly.

EEiEIzStereoeffectwith-”Aiwa Front180° speaker system

True stereo sound can be heard at point@ as well as point

Main unit

Left speaket

ENGLLSH26