Manual Aiwa CX-NA92 (page 27 of 80) (English, French, Spanish)

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Aiwa’s Front 180° Speaker System provides

excellent sound balance for true stereo

reproduction from any listening ang”le.

In stereo sound reproductions systems up to

now, the listening area where the optimal stereo

effect is obtained has been extremely narrow.

This is due to the following reasons.

As shown in Figure 2, a conventional stereo

system has speakers on the front panel of the

speaker system, pointing forward. It is designed

for listening in a location directly in front

of the front speaker panel.

In this case,

as shown in Figure 2, a listener

at point@,

located on the center line between

the right and left speakers, hears the voice of

a singer coming from the center front.

Instrumental sounds are distributed evenly

between both speakers

for an optimal stereo

effect.

At point @), however,

located off the center

cline 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

of imbalance.

For these reasons, the listening

area which provides even sound balance and the

optimal stereo effect is limited to the narrow

area shown in Figure 2-@. .

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.

EEm

Front 180° speaker system

Tweeter

Cardioid

speaker

Woofer

eaker)

DizEzl

Stereo effect with a conventional speaker

svstem

Main unit

Left

speaker

Right

speaker

@ Center listening point:

Balanced sound heard from left

and right speakers

@Off-center listening point: Right speaker sounds louder

than left speaker

+: Sound pressure level

“’~’w$:r~~~’~Stereo listening area

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.......>> .

Stereoeffectwith Aiwa Front 180” speaker

system

True stereo sound can beheard atpoint @aswell aspoint

Left

speaker

Main unit

+: Sound pressure level

:w%%wH&w:Stereo listening area of new speakers

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Right

speaker

EPIGLISH26

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Aiwa CX-NA92 Manual

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