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The typical stereo system is made up of a number of
individual components. We will
discuss those various parts in this article.
Just about everyone knows what speakers are.
Speakers convert the electrical signals emitted from the amplifier into
acoustic energy or sound.
Higher-end speakers are often smaller and can be a little light on the bass,
especially the lower priced ones.
It is actually an expensive undertaking to create a speaker which really has a
deep bass sound, yet does not sound too heavy.
Therefore many designers of higher-end but lower-priced speakers have to
compromise, building smaller, more rigid cabinets, sacrificing truly deep bass
for tightness and instead diverting money they might have spent on larger boxes
into drivers that will produce a musical midrange and smooth treble.
typical receiver is actually made up of three to four components. It will
include a tuner, which is what you use to listen to the radio.
There is also a pre-amplifier, which accepts the signals from other
components and permits to you to select which one to listen to, permits you to
adjust the volume and amplification.
There will be a power amplifier, which accepts the signal from the
pre-amplifier and produces the signal that is then passed on to the speakers.
If the receiver is one of the few that has a phono input, then it will
also have a phono pre-amplifier, which takes the low-level signal from the
turntable and amplifies it to a level that the main pre-amplifier can use.
we will discuss the power amplifier.
The power amplifier is to produce the signal that drives the speakers.
The higher watts produced per channel, the better.
Higher-end amplifiers are designed not only to produce impressive
measurements on the test bench, but actually drive speakers.
Those amplifiers will almost always deliver a lot more current than a
consumer one, allowing greater control over the speakerís performance, and
greater ability to respond properly to variations in that performance.
In a higher-end power amplifier, much of the cost is absorbed by the
power supply that provides raw current to the circuitry.
This is crucial; the modulation of this current is the amplifierís
primary job. The amplifier must be
able to produce a clean, steady flow of raw current and prevent contaminants
from entering that flow.