Snell Illusion A, Руководство пользователя

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The distance between the I
LLUSION
A7s will largely dictate
breadth of stereo image. If the speakers are placed too close
together the image will be too narrow; if too far apart
it can become too diffuse, ultimately yielding a “hole in
the middle” effect. Most rooms will perform best with an
angular separation of between 45º and 60º (viewed from
above) between the left and right A7s. Expressed another
way, this is usually arrived at by a separation between the
two loudspeakers of about 0.85 the distance from the prime
listening position to either speaker. It is quite important
that the distance from the left and right speakers to the
listening position is equal; using a tape measure to confi rm
these dimensions will prove well worth the effort.
Toe-in—the angling of the speakers inward toward the lis-
tening position—is a matter of room acoustics and individ-
ual preference. Generally, toe-in adjustment is best left to
the last stage of placement fi ne-tuning. In typical rooms, as
toe-in increases the stereo effect can become more sharply
defi ned, that is, more “pinpoint,” somewhat like listening via
fi ne headphones. Aligning the A7s square, without toe-in,
usually will yield a more spacious sound with a more diffuse
center image; adding toe-in generally improves balance of
stereo effect for listeners seated off-center. Ultimately, the
degree of toe-in will be determined purely by taste, though
electing an angle beyond 20° is less usual.
Properly placed, the A7s will produce a palpable “virtual
stage” from left to right, with a substantial illusion of
sound originating laterally beyond each speaker, as well as a
profound impression of depth.
S T E R E O I M A G E
45°- 60°
Distance Between Speakers =
0.85 x Distance to Listening Area
Distance to Listening Ar
ea