AudioControl SA-3052A, Руководство по эксплуатации

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SA-3052A Owner’s Manual
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audio standpoint.
• The ambient noise level is fairly high.
• The spectrum of the ambient noise level is not flat.
• People who sit in the front want to be able to hear, without having the people in
the rear deafened, and vice versa.
• The choice of mounting locations for loudspeakers is somewhat limited, as is the
amount of available space.
• The automobile was designed as a means of transportation first, and as a listening
environment last.
Equalization as a Solution
Although the situation in most home or studio environments is not nearly as extreme
as that within a car, all world-class studios and sophisticated home systems use carefully
applied equalization. Here the equalizer provides a means of fitting the speaker into the
environment, much like the final voicing that a pipe organ undergoes when it is finally
installed. In recording facilities that have multiple studios, equalization provides a means
for making the rooms sound alike; this provides a more consistent and predictable acous-
tical environment for the recording engineer.
A common anti-equalizer argument is that good speakers don’t need equalization.
In an ideal situation, that argument holds water, but in most cases (translate: real world),
there aren’t many loudspeaker/listening environment combinations that couldn’t benefit
from some judicious equalization.
For the home listener, there are a few options that should be exercised before using
any sort of equalization:
• Change the placement of the speakers within the room to vary the bass response.
You can increase the bass response by setting the speaker directly on the floor, or
into a corner. You can decrease the bass response by moving the speaker away
from a wall or corner, or by raising it off the floor with a speaker stand.
• The treble response can be altered to some degree by changing the amount of high-
frequency absorption within the room, or by changing the settings of the speaker’s
mid- or high-frequency balance controls.
• The human voice is a good test signal to use to evaluate the naturalness of your
system’s reproduction. The spoken word can be more revealing than singing, but
you should use both for your evaluation.
In a car, the positions of the speakers are limited, and most installers just can’t afford
to try more than a couple of different positions within the car. If you’re the installer, how
many times can you afford to replace the door panels or the rear deck panel if the sound
isn’t quite right? You could add some high-frequency absorption (say...some extra cush-
ions), but they would probably end up in the trunk the first time that the car was used to
carry passengers. Last, how many car speakers have high-frequency balance controls?
In most home stereo systems, the supplied bass and treble controls are sufficient for
Chapter 5 - A Primer on Car Acoustics