AudioControl Architect 560, Руководство пользователя

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ARCHITECT
Model 560
Model 735
Model 760
Installer’s Guide
™
A Short Introduction To Equalizers and
Acoustics
Magazine reviewers and audio system owners spend much
time critically appraising speaker and other stereo components.
Unfortunately, a phenomenon that has a very large effect upon
sound is not easily judged or changed. That effect is the ACOUS-
TICS of the environment in which you are listening.
Room acoustics is a complicated subject about which entire
textbooks have been written. We simply want you to be aware of
a few basics that have a direct effect on real time audio analysis.
Sound travels in waves, as you probably learned in junior high
school. In a stereo system, these waves are created by the speak-
ers. Like waves in a pond
created by a splash, sound
waves emanate from the
transducers (drivers) in your
speakers and spread out into
the room. If your room were
infinitely big, that’s all there
would be to it. But just like
waves in a pond reach the
bank and reflect back, sound
waves bounce off walls,
ceilings, and floors, reflect-
ing, reinforcing and canceling
each other as shown in the
figure above. Since sound is
energy, the way it reflects
depends upon the angle of the
surface, the type of material and the frequency of the sound wave.
Because your listening position is likely to be towards the back of
the Free Field waves shown in the diagram, you also get part of
the reflected Reverberant Field as well.
Now we add the next set of complications: Different frequen-
cies of sound have different wave lengths (a function of frequency
and the speed of sound). Each frequency’s wavelength contrib-
utes differently to the Free and Reverberant Fields because they
are different sizes. For example, a 32Hz bass note has a wave-
length of 35 FEET, while a 16,000Hz note has a wavelength just
under a tenth of an inch. Tiny treble waves can be caught and
neutralized by draperies, carpeting, upholstered furniture and
gangs of indolent Persian cats…while gigantic bass waves simply
slosh back and forth in the room.
Short Introduction To
Equalizers and
Acoustics
13
Room interaction