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How a cable itself affects the audio signal

Every h05rn-f cable has a set of electrical properties that can be
measured using standard electrical testing equipment. The
three most basic properties are resistance, capacitance and
inductance. While a detailed description of these three
different electrical properties is outside the scope of this
article, a basic description of the relevant effects of
these three properties can be given.

Resistance opposes current. The higher the resistance the
greater the amount of energy that is removed from the current
and turned into heat.

- Capacitance opposes changes in voltage. If a voltage is
increasing, capacitance will cause the voltage to increase
more slowly. If a voltage is decreasing, capacitance will
cause the flexible cable types voltage to decrease more slowly.

- Inductance opposes changes in current. If current is
increasing, inductance will cause the current to increase
more slowly. If current is decreasing, inductance will cause
the current to decrease more slowly.

The final piece of background knowledge that is needed for
this article is what the audio signal looks like. If one
were to take the speaker cover off a speaker to look at the
speaker cone while music is playing, you would see that it
is moving back and forth. In order to move the speaker cone
back and forth, the electrical signal must push and then
pull the cone in rapid and repeating fashion. This is
accomplished by having an Alternating Current, or AC.
Alternating Current simply means that the voltage oscillates
between positive and negative. Because the voltage drives
the current, this means that the current also goes positive
and negative. In other words, the current is going back and
forth in the wire, just like the flexible control cable speaker cone. The subtle
variations in how fast the voltage and current go back and
forth creates the different sounds that we hear when
listening to music.

How a cable itself affects the audio signal

Now, going back to the ways that the cable itself can change
the signal going through it, let's consider both types of
cables separately.

As stated previously, interconnect 2 gauge battery cable by the foot carry a very small
amount of current. Relative to the current the voltage is
large. Because of that fact, capacitance is important, but
inductance is relatively unimportant. As the voltage
oscillates between being positive and negative, the
capacitance slows the voltage changes down, and causes
delays. This can cause audible distortion in the sound.
Because interconnects have very little current, resistance
is not much of a factor. Even an interconnect with extremely
high resistance will only remove an infinitesimally small
amount of energy.

18.7.17 09:34


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