Publicidad
Idiomas disponibles
Idiomas disponibles
Aiwa's
Front
180" Speaker
System
provides
excellent
sound
balance
for true stereo reproduction
from any listening
angle.
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
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
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
unidirectional
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.
EiiE!l
Front 180" speaker system
I
Ma"in speaker
Cardioid
speaker
(Right speaker)
I Figure 2 I
Stereo effect with a conventional
s~eaker
I
1
system
Main unit
— Right
speaker
@ Center listening point:
Balanced
sound heard from left
and right speakers
(j) Off-center listening point:
Right speaker sounds louder than
left speaker
+: Sound pressure level
m:
Stereo listening area
w
Stereo effect with Aiwa Front 180"
speaker system
True stereo sound can be heard at point@
as well as point @.
Main unit
+: Sound pressure level
m:
Stereo listening area of new speakers
ENGLISH
I
9
Publicidad
