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In order to answer the
above question, one must seek to understand the limits of the human
sense of hearing. Most people realize that the human ear fails to hear
sounds that many animals can detect. For example, humans do not hear
the noise made by a dog whistle, but a dog pricks-up its ears whenever
a human blows into such a whistle. Those sound waves have a frequency
that goes beyond the limits of what the human ear can hear. Many of
the sound waves that remain undetected by the human ear can be
detected by a sensitive car audio equalizer.
The
frequency of a sound indicates the rate at which the sound making
device is moving. A fast moving device makes a high frequency sound; a
slow-moving device makes a low frequency sound. The human ear cannot
hear the sounds with the lowest and the highest frequencies. The car
audio equalizer has the ability to pick-up the signals from those
sounds. The owner of a car audio system wants an equalizer that
can sense, that can pick-up or detect the signals from the high and low
frequency sounds. Within the car audio system, the electrical signals
leave the preamplifier and travel to the equalizer. In the car audio
equalizer the signals loop around the processing unit and the
frequencies of the signals are adjusted. The adjusted signals then
travel back to the preamplifier. The preamplifier sends the adjusted
signals to the amplifier.
In the amplifier, the power of the
adjusted signals is increased. The high-power signals then cause the
speaker to vibrate. The vibrating cone of the speaker causes it to emit
sound. Because the signals have been adjusted by the car audio
equalizer, all of the sounds coming from the speakers will be heard by
the humans riding in the car with that car audio system. (No doubt,
dogs in the car would hear those same sounds.)...
AuSebastian is the author of
Car Sound Systems.
If you want to know more about car sound systems, visit the site to
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